From 58254e1002a82eb383c5977ad9fd5a451b91fe29 Mon Sep 17 00:00:00 2001
From: Al Viro <viro@zeniv.linux.org.uk>
Date: Wed, 12 Sep 2012 18:32:42 -0400
Subject: powerpc: split ret_from_fork

... and get rid of in-kernel syscalls in kernel_thread()

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
---
 arch/powerpc/Kconfig                 |  1 +
 arch/powerpc/include/asm/processor.h |  3 ---
 arch/powerpc/kernel/entry_32.S       | 11 +++++++++++
 arch/powerpc/kernel/entry_64.S       | 10 ++++++++++
 arch/powerpc/kernel/misc_32.S        | 33 ---------------------------------
 arch/powerpc/kernel/misc_64.S        | 34 ----------------------------------
 arch/powerpc/kernel/ppc_ksyms.c      |  1 -
 arch/powerpc/kernel/process.c        | 34 +++++++++++++++++++++-------------
 8 files changed, 43 insertions(+), 84 deletions(-)

diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index 352f416269ce..6e5a0979c085 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -139,6 +139,7 @@ config PPC
 	select GENERIC_CLOCKEVENTS
 	select GENERIC_STRNCPY_FROM_USER
 	select GENERIC_STRNLEN_USER
+	select GENERIC_KERNEL_THREAD
 
 config EARLY_PRINTK
 	bool
diff --git a/arch/powerpc/include/asm/processor.h b/arch/powerpc/include/asm/processor.h
index 54b73a28c205..5376453d90cc 100644
--- a/arch/powerpc/include/asm/processor.h
+++ b/arch/powerpc/include/asm/processor.h
@@ -74,9 +74,6 @@ struct task_struct;
 void start_thread(struct pt_regs *regs, unsigned long fdptr, unsigned long sp);
 void release_thread(struct task_struct *);
 
-/* Create a new kernel thread. */
-extern long kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
-
 /* Lazy FPU handling on uni-processor */
 extern struct task_struct *last_task_used_math;
 extern struct task_struct *last_task_used_altivec;
diff --git a/arch/powerpc/kernel/entry_32.S b/arch/powerpc/kernel/entry_32.S
index ead5016b02d0..6eb330a87c36 100644
--- a/arch/powerpc/kernel/entry_32.S
+++ b/arch/powerpc/kernel/entry_32.S
@@ -435,6 +435,17 @@ ret_from_fork:
 	li	r3,0
 	b	ret_from_syscall
 
+	.globl	ret_from_kernel_thread
+ret_from_kernel_thread:
+	REST_NVGPRS(r1)
+	bl	schedule_tail
+	mtlr	r14
+	mr	r3,r15
+	PPC440EP_ERR42
+	blrl
+	li	r3,0
+	b	do_exit		# no return
+
 /* Traced system call support */
 syscall_dotrace:
 	SAVE_NVGPRS(r1)
diff --git a/arch/powerpc/kernel/entry_64.S b/arch/powerpc/kernel/entry_64.S
index b40e0b4815b3..d7f4fafc7515 100644
--- a/arch/powerpc/kernel/entry_64.S
+++ b/arch/powerpc/kernel/entry_64.S
@@ -370,6 +370,16 @@ _GLOBAL(ret_from_fork)
 	li	r3,0
 	b	syscall_exit
 
+_GLOBAL(ret_from_kernel_thread)
+	bl	.schedule_tail
+	REST_NVGPRS(r1)
+	REST_GPR(2,r1)
+	mtlr	r14
+	mr	r3,r15
+	blrl
+	li	r3,0
+	b	.do_exit	# no return
+
 	.section	".toc","aw"
 DSCR_DEFAULT:
 	.tc dscr_default[TC],dscr_default
diff --git a/arch/powerpc/kernel/misc_32.S b/arch/powerpc/kernel/misc_32.S
index 407e293aad2f..19e096bd0e73 100644
--- a/arch/powerpc/kernel/misc_32.S
+++ b/arch/powerpc/kernel/misc_32.S
@@ -663,39 +663,6 @@ _GLOBAL(abs)
 	sub	r3,r3,r4
 	blr
 
-/*
- * Create a kernel thread
- *   kernel_thread(fn, arg, flags)
- */
-_GLOBAL(kernel_thread)
-	stwu	r1,-16(r1)
-	stw	r30,8(r1)
-	stw	r31,12(r1)
-	mr	r30,r3		/* function */
-	mr	r31,r4		/* argument */
-	ori	r3,r5,CLONE_VM	/* flags */
-	oris	r3,r3,CLONE_UNTRACED>>16
-	li	r4,0		/* new sp (unused) */
-	li	r0,__NR_clone
-	sc
-	bns+	1f		/* did system call indicate error? */
-	neg	r3,r3		/* if so, make return code negative */
-1:	cmpwi	0,r3,0		/* parent or child? */
-	bne	2f		/* return if parent */
-	li	r0,0		/* make top-level stack frame */
-	stwu	r0,-16(r1)
-	mtlr	r30		/* fn addr in lr */
-	mr	r3,r31		/* load arg and call fn */
-	PPC440EP_ERR42
-	blrl
-	li	r0,__NR_exit	/* exit if function returns */
-	li	r3,0
-	sc
-2:	lwz	r30,8(r1)
-	lwz	r31,12(r1)
-	addi	r1,r1,16
-	blr
-
 #ifdef CONFIG_SMP
 _GLOBAL(start_secondary_resume)
 	/* Reset stack */
diff --git a/arch/powerpc/kernel/misc_64.S b/arch/powerpc/kernel/misc_64.S
index 565b78625a32..5cfa8008693b 100644
--- a/arch/powerpc/kernel/misc_64.S
+++ b/arch/powerpc/kernel/misc_64.S
@@ -406,40 +406,6 @@ _GLOBAL(scom970_write)
 #endif /* CONFIG_CPU_FREQ_PMAC64 || CONFIG_CPU_FREQ_MAPLE */
 
 
-/*
- * Create a kernel thread
- *   kernel_thread(fn, arg, flags)
- */
-_GLOBAL(kernel_thread)
-	std	r29,-24(r1)
-	std	r30,-16(r1)
-	stdu	r1,-STACK_FRAME_OVERHEAD(r1)
-	mr	r29,r3
-	mr	r30,r4
-	ori	r3,r5,CLONE_VM	/* flags */
-	oris	r3,r3,(CLONE_UNTRACED>>16)
-	li	r4,0		/* new sp (unused) */
-	li	r0,__NR_clone
-	sc
-	bns+	1f		/* did system call indicate error? */
-	neg	r3,r3		/* if so, make return code negative */
-1:	cmpdi	0,r3,0		/* parent or child? */
-	bne	2f		/* return if parent */
-	li	r0,0
-	stdu	r0,-STACK_FRAME_OVERHEAD(r1)
-	ld	r2,8(r29)
-	ld	r29,0(r29)
-	mtlr	r29              /* fn addr in lr */
-	mr	r3,r30	        /* load arg and call fn */
-	blrl
-	li	r0,__NR_exit	/* exit after child exits */
-        li	r3,0
-	sc
-2:	addi	r1,r1,STACK_FRAME_OVERHEAD
-	ld	r29,-24(r1)
-	ld	r30,-16(r1)
-	blr
-
 /*
  * disable_kernel_fp()
  * Disable the FPU.
diff --git a/arch/powerpc/kernel/ppc_ksyms.c b/arch/powerpc/kernel/ppc_ksyms.c
index 3e4031581c65..19e4288d8486 100644
--- a/arch/powerpc/kernel/ppc_ksyms.c
+++ b/arch/powerpc/kernel/ppc_ksyms.c
@@ -94,7 +94,6 @@ EXPORT_SYMBOL(pci_dram_offset);
 #endif /* CONFIG_PCI */
 
 EXPORT_SYMBOL(start_thread);
-EXPORT_SYMBOL(kernel_thread);
 
 EXPORT_SYMBOL(giveup_fpu);
 #ifdef CONFIG_ALTIVEC
diff --git a/arch/powerpc/kernel/process.c b/arch/powerpc/kernel/process.c
index 1a1f2ddfb581..3b06898fa175 100644
--- a/arch/powerpc/kernel/process.c
+++ b/arch/powerpc/kernel/process.c
@@ -734,30 +734,39 @@ int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src)
 extern unsigned long dscr_default; /* defined in arch/powerpc/kernel/sysfs.c */
 
 int copy_thread(unsigned long clone_flags, unsigned long usp,
-		unsigned long unused, struct task_struct *p,
+		unsigned long arg, struct task_struct *p,
 		struct pt_regs *regs)
 {
 	struct pt_regs *childregs, *kregs;
 	extern void ret_from_fork(void);
+	extern void ret_from_kernel_thread(void);
+	void (*f)(void);
 	unsigned long sp = (unsigned long)task_stack_page(p) + THREAD_SIZE;
 
-	CHECK_FULL_REGS(regs);
 	/* Copy registers */
 	sp -= sizeof(struct pt_regs);
 	childregs = (struct pt_regs *) sp;
-	*childregs = *regs;
-	if ((childregs->msr & MSR_PR) == 0) {
+	if (!regs) {
 		/* for kernel thread, set `current' and stackptr in new task */
+		memset(childregs, 0, sizeof(struct pt_regs));
 		childregs->gpr[1] = sp + sizeof(struct pt_regs);
-#ifdef CONFIG_PPC32
-		childregs->gpr[2] = (unsigned long) p;
-#else
+#ifdef CONFIG_PPC64
+		childregs->gpr[14] = *(unsigned long *)usp;
+		childregs->gpr[2] = ((unsigned long *)usp)[1],
 		clear_tsk_thread_flag(p, TIF_32BIT);
+#else
+		childregs->gpr[14] = usp;	/* function */
+		childregs->gpr[2] = (unsigned long) p;
 #endif
+		childregs->gpr[15] = arg;
 		p->thread.regs = NULL;	/* no user register state */
+		f = ret_from_kernel_thread;
 	} else {
+		CHECK_FULL_REGS(regs);
+		*childregs = *regs;
 		childregs->gpr[1] = usp;
 		p->thread.regs = childregs;
+		childregs->gpr[3] = 0;  /* Result from fork() */
 		if (clone_flags & CLONE_SETTLS) {
 #ifdef CONFIG_PPC64
 			if (!is_32bit_task())
@@ -766,8 +775,9 @@ int copy_thread(unsigned long clone_flags, unsigned long usp,
 #endif
 				childregs->gpr[2] = childregs->gpr[6];
 		}
+
+		f = ret_from_fork;
 	}
-	childregs->gpr[3] = 0;  /* Result from fork() */
 	sp -= STACK_FRAME_OVERHEAD;
 
 	/*
@@ -806,19 +816,17 @@ int copy_thread(unsigned long clone_flags, unsigned long usp,
 		p->thread.dscr = current->thread.dscr;
 	}
 #endif
-
 	/*
 	 * The PPC64 ABI makes use of a TOC to contain function 
 	 * pointers.  The function (ret_from_except) is actually a pointer
 	 * to the TOC entry.  The first entry is a pointer to the actual
 	 * function.
- 	 */
+	 */
 #ifdef CONFIG_PPC64
-	kregs->nip = *((unsigned long *)ret_from_fork);
+	kregs->nip = *((unsigned long *)f);
 #else
-	kregs->nip = (unsigned long)ret_from_fork;
+	kregs->nip = (unsigned long)f;
 #endif
-
 	return 0;
 }
 
-- 
cgit v1.2.3


From be6abfa769fa07ce89ac73273360b335ae978805 Mon Sep 17 00:00:00 2001
From: Al Viro <viro@zeniv.linux.org.uk>
Date: Fri, 31 Aug 2012 15:48:05 -0400
Subject: powerpc: switch to generic sys_execve()/kernel_execve()

the only non-obvious part is that current_pt_regs() is really needed
here - task_pt_regs() is NULL for kernel threads; it's OK for ptrace
uses (the thing task_pt_regs() is intended for), but not for us.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
---
 arch/powerpc/include/asm/ptrace.h   |  2 ++
 arch/powerpc/include/asm/syscalls.h |  3 ---
 arch/powerpc/include/asm/unistd.h   |  2 ++
 arch/powerpc/kernel/entry_32.S      |  5 +++++
 arch/powerpc/kernel/entry_64.S      |  6 ++++++
 arch/powerpc/kernel/misc.S          |  7 -------
 arch/powerpc/kernel/process.c       | 25 ++++++-------------------
 arch/powerpc/kernel/sys_ppc32.c     | 22 ----------------------
 8 files changed, 21 insertions(+), 51 deletions(-)

diff --git a/arch/powerpc/include/asm/ptrace.h b/arch/powerpc/include/asm/ptrace.h
index 9c21ed42aba6..f76b88c367d1 100644
--- a/arch/powerpc/include/asm/ptrace.h
+++ b/arch/powerpc/include/asm/ptrace.h
@@ -125,6 +125,8 @@ extern unsigned long ptrace_get_reg(struct task_struct *task, int regno);
 extern int ptrace_put_reg(struct task_struct *task, int regno,
 			  unsigned long data);
 
+#define current_pt_regs() \
+	((struct pt_regs *)((unsigned long)current_thread_info() + THREAD_SIZE) - 1)
 /*
  * We use the least-significant bit of the trap field to indicate
  * whether we have saved the full set of registers, or only a
diff --git a/arch/powerpc/include/asm/syscalls.h b/arch/powerpc/include/asm/syscalls.h
index 4084e567d28e..329db4ec12ca 100644
--- a/arch/powerpc/include/asm/syscalls.h
+++ b/arch/powerpc/include/asm/syscalls.h
@@ -17,9 +17,6 @@ asmlinkage unsigned long sys_mmap(unsigned long addr, size_t len,
 asmlinkage unsigned long sys_mmap2(unsigned long addr, size_t len,
 		unsigned long prot, unsigned long flags,
 		unsigned long fd, unsigned long pgoff);
-asmlinkage int sys_execve(unsigned long a0, unsigned long a1,
-		unsigned long a2, unsigned long a3, unsigned long a4,
-		unsigned long a5, struct pt_regs *regs);
 asmlinkage int sys_clone(unsigned long clone_flags, unsigned long usp,
 		int __user *parent_tidp, void __user *child_threadptr,
 		int __user *child_tidp, int p6, struct pt_regs *regs);
diff --git a/arch/powerpc/include/asm/unistd.h b/arch/powerpc/include/asm/unistd.h
index bd377a368611..26a6825909b6 100644
--- a/arch/powerpc/include/asm/unistd.h
+++ b/arch/powerpc/include/asm/unistd.h
@@ -420,6 +420,8 @@
 #define __ARCH_WANT_COMPAT_SYS_RT_SIGSUSPEND
 #define __ARCH_WANT_SYS_NEWFSTATAT
 #endif
+#define __ARCH_WANT_SYS_EXECVE
+#define __ARCH_WANT_KERNEL_EXECVE
 
 /*
  * "Conditional" syscalls
diff --git a/arch/powerpc/kernel/entry_32.S b/arch/powerpc/kernel/entry_32.S
index 6eb330a87c36..e6be75fc491a 100644
--- a/arch/powerpc/kernel/entry_32.S
+++ b/arch/powerpc/kernel/entry_32.S
@@ -446,6 +446,11 @@ ret_from_kernel_thread:
 	li	r3,0
 	b	do_exit		# no return
 
+	.globl	__ret_from_kernel_execve
+__ret_from_kernel_execve:
+	addi	r1,r3,-STACK_FRAME_OVERHEAD
+	b	ret_from_syscall
+
 /* Traced system call support */
 syscall_dotrace:
 	SAVE_NVGPRS(r1)
diff --git a/arch/powerpc/kernel/entry_64.S b/arch/powerpc/kernel/entry_64.S
index d7f4fafc7515..1ca3d9fa48c4 100644
--- a/arch/powerpc/kernel/entry_64.S
+++ b/arch/powerpc/kernel/entry_64.S
@@ -380,6 +380,12 @@ _GLOBAL(ret_from_kernel_thread)
 	li	r3,0
 	b	.do_exit	# no return
 
+_GLOBAL(__ret_from_kernel_execve)
+	addi	r1,r3,-STACK_FRAME_OVERHEAD
+	li	r10,1
+	std	r10,SOFTE(r1)
+	b	syscall_exit
+
 	.section	".toc","aw"
 DSCR_DEFAULT:
 	.tc dscr_default[TC],dscr_default
diff --git a/arch/powerpc/kernel/misc.S b/arch/powerpc/kernel/misc.S
index ba16874fe294..7ce26d45777e 100644
--- a/arch/powerpc/kernel/misc.S
+++ b/arch/powerpc/kernel/misc.S
@@ -54,13 +54,6 @@ _GLOBAL(add_reloc_offset)
 	.align	3
 2:	PPC_LONG 1b
 
-_GLOBAL(kernel_execve)
-	li	r0,__NR_execve
-	sc
-	bnslr
-	neg	r3,r3
-	blr
-
 _GLOBAL(setjmp)
 	mflr	r0
 	PPC_STL	r0,0(r3)
diff --git a/arch/powerpc/kernel/process.c b/arch/powerpc/kernel/process.c
index 3b06898fa175..6fdf044f475c 100644
--- a/arch/powerpc/kernel/process.c
+++ b/arch/powerpc/kernel/process.c
@@ -1064,26 +1064,13 @@ int sys_vfork(unsigned long p1, unsigned long p2, unsigned long p3,
 			regs, 0, NULL, NULL);
 }
 
-int sys_execve(unsigned long a0, unsigned long a1, unsigned long a2,
-	       unsigned long a3, unsigned long a4, unsigned long a5,
-	       struct pt_regs *regs)
+void __ret_from_kernel_execve(struct pt_regs *normal)
+__noreturn;
+
+void ret_from_kernel_execve(struct pt_regs *normal)
 {
-	int error;
-	char *filename;
-
-	filename = getname((const char __user *) a0);
-	error = PTR_ERR(filename);
-	if (IS_ERR(filename))
-		goto out;
-	flush_fp_to_thread(current);
-	flush_altivec_to_thread(current);
-	flush_spe_to_thread(current);
-	error = do_execve(filename,
-			  (const char __user *const __user *) a1,
-			  (const char __user *const __user *) a2, regs);
-	putname(filename);
-out:
-	return error;
+	set_thread_flag(TIF_RESTOREALL);
+	__ret_from_kernel_execve(normal);
 }
 
 static inline int valid_irq_stack(unsigned long sp, struct task_struct *p,
diff --git a/arch/powerpc/kernel/sys_ppc32.c b/arch/powerpc/kernel/sys_ppc32.c
index 81c570633ead..a1ae73a0f352 100644
--- a/arch/powerpc/kernel/sys_ppc32.c
+++ b/arch/powerpc/kernel/sys_ppc32.c
@@ -187,28 +187,6 @@ asmlinkage int compat_sys_sendfile64(int out_fd, int in_fd, compat_loff_t __user
 	return ret;
 }
 
-long compat_sys_execve(unsigned long a0, unsigned long a1, unsigned long a2,
-		  unsigned long a3, unsigned long a4, unsigned long a5,
-		  struct pt_regs *regs)
-{
-	int error;
-	char * filename;
-	
-	filename = getname((char __user *) a0);
-	error = PTR_ERR(filename);
-	if (IS_ERR(filename))
-		goto out;
-	flush_fp_to_thread(current);
-	flush_altivec_to_thread(current);
-
-	error = compat_do_execve(filename, compat_ptr(a1), compat_ptr(a2), regs);
-
-	putname(filename);
-
-out:
-	return error;
-}
-
 /* Note: it is necessary to treat option as an unsigned int, 
  * with the corresponding cast to a signed int to insure that the 
  * proper conversion (sign extension) between the register representation of a signed int (msr in 32-bit mode)
-- 
cgit v1.2.3


From 0973c687e05a802a757664722678d2b5016f1c1c Mon Sep 17 00:00:00 2001
From: Greg Ungerer <gerg@uclinux.org>
Date: Wed, 12 Sep 2012 05:13:19 -0400
Subject: m68k: always set stack frame format for ColdFire on thread start

The stack frame "format" field needs to be explicitly set on thread creation
on ColdFire. For a normal long word aligned user stack pointer the frame
format is 0x4.

We were doing this for non-MMU ColdFire, but not for the case with MMU enabled.
So fix it so we always do it if targeting ColdFire.

The old code happend to rely on the stack frame format being inhereted from
the process calling exec. Furture changes means that may not always work,
so we really do want to set it explicitly.

Signed-off-by: Greg Ungerer <gerg@uclinux.org>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
---
 arch/m68k/include/asm/processor.h | 23 ++++++++++++-----------
 1 file changed, 12 insertions(+), 11 deletions(-)

diff --git a/arch/m68k/include/asm/processor.h b/arch/m68k/include/asm/processor.h
index f17c42aff7ff..9b4c82c1ef47 100644
--- a/arch/m68k/include/asm/processor.h
+++ b/arch/m68k/include/asm/processor.h
@@ -100,6 +100,16 @@ struct thread_struct {
 	.fs	= __KERNEL_DS,						\
 }
 
+/*
+ * ColdFire stack format sbould be 0x4 for an aligned usp (will always be
+ * true on thread creation). We need to set this explicitly.
+ */
+#ifdef CONFIG_COLDFIRE
+#define setframeformat(_regs)	do { (_regs)->format = 0x4; } while(0)
+#else
+#define setframeformat(_regs)	do { } while (0)
+#endif
+
 #ifdef CONFIG_MMU
 /*
  * Do necessary setup to start up a newly executed thread.
@@ -109,6 +119,7 @@ static inline void start_thread(struct pt_regs * regs, unsigned long pc,
 {
 	regs->pc = pc;
 	regs->sr &= ~0x2000;
+	setframeformat(regs);
 	wrusp(usp);
 }
 
@@ -116,21 +127,11 @@ extern int handle_kernel_fault(struct pt_regs *regs);
 
 #else
 
-/*
- * Coldfire stacks need to be re-aligned on trap exit, conventional
- * 68k can handle this case cleanly.
- */
-#ifdef CONFIG_COLDFIRE
-#define reformat(_regs)		do { (_regs)->format = 0x4; } while(0)
-#else
-#define reformat(_regs)		do { } while (0)
-#endif
-
 #define start_thread(_regs, _pc, _usp)                  \
 do {                                                    \
 	(_regs)->pc = (_pc);                            \
 	((struct switch_stack *)(_regs))[-1].a6 = 0;    \
-	reformat(_regs);                                \
+	setframeformat(_regs);                          \
 	if (current->mm)                                \
 		(_regs)->d5 = current->mm->start_data;  \
 	(_regs)->sr &= ~0x2000;                         \
-- 
cgit v1.2.3


From 533e6903bea0440816a0f517b0845ccea4cc7917 Mon Sep 17 00:00:00 2001
From: Al Viro <viro@zeniv.linux.org.uk>
Date: Sun, 16 Sep 2012 12:05:09 -0400
Subject: m68k: split ret_from_fork(), simplify kernel_thread()

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
---
 arch/m68k/Kconfig                 |  1 +
 arch/m68k/include/asm/processor.h |  2 -
 arch/m68k/kernel/entry.S          | 11 +++++
 arch/m68k/kernel/process.c        | 84 +++++++++++----------------------------
 4 files changed, 36 insertions(+), 62 deletions(-)

diff --git a/arch/m68k/Kconfig b/arch/m68k/Kconfig
index b22df9410dce..ccda007ba40f 100644
--- a/arch/m68k/Kconfig
+++ b/arch/m68k/Kconfig
@@ -13,6 +13,7 @@ config M68K
 	select FPU if MMU
 	select ARCH_WANT_IPC_PARSE_VERSION
 	select ARCH_USES_GETTIMEOFFSET if MMU && !COLDFIRE
+	select GENERIC_KERNEL_THREAD
 
 config RWSEM_GENERIC_SPINLOCK
 	bool
diff --git a/arch/m68k/include/asm/processor.h b/arch/m68k/include/asm/processor.h
index 9b4c82c1ef47..ae700f49e51d 100644
--- a/arch/m68k/include/asm/processor.h
+++ b/arch/m68k/include/asm/processor.h
@@ -154,8 +154,6 @@ static inline void release_thread(struct task_struct *dead_task)
 {
 }
 
-extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
-
 /*
  * Free current thread data structures etc..
  */
diff --git a/arch/m68k/kernel/entry.S b/arch/m68k/kernel/entry.S
index 165ee9f9d5c9..8a01f580a024 100644
--- a/arch/m68k/kernel/entry.S
+++ b/arch/m68k/kernel/entry.S
@@ -111,6 +111,17 @@ ENTRY(ret_from_fork)
 	addql	#4,%sp
 	jra	ret_from_exception
 
+ENTRY(ret_from_kernel_thread)
+	| a3 contains the kernel thread payload, d7 - its argument
+	movel	%d1,%sp@-
+	jsr	schedule_tail
+	GET_CURRENT(%d0)
+	movel	%d7,(%sp)
+	jsr	%a3@
+	addql	#4,%sp
+	movel	%d0,(%sp)
+	jra	sys_exit
+
 #if defined(CONFIG_COLDFIRE) || !defined(CONFIG_MMU)
 
 #ifdef TRAP_DBG_INTERRUPT
diff --git a/arch/m68k/kernel/process.c b/arch/m68k/kernel/process.c
index c488e3cfab53..b3d4760c9750 100644
--- a/arch/m68k/kernel/process.c
+++ b/arch/m68k/kernel/process.c
@@ -34,6 +34,7 @@
 
 
 asmlinkage void ret_from_fork(void);
+asmlinkage void ret_from_kernel_thread(void);
 
 
 /*
@@ -120,51 +121,6 @@ void show_regs(struct pt_regs * regs)
 		printk("USP: %08lx\n", rdusp());
 }
 
-/*
- * Create a kernel thread
- */
-int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags)
-{
-	int pid;
-	mm_segment_t fs;
-
-	fs = get_fs();
-	set_fs (KERNEL_DS);
-
-	{
-	register long retval __asm__ ("d0");
-	register long clone_arg __asm__ ("d1") = flags | CLONE_VM | CLONE_UNTRACED;
-
-	retval = __NR_clone;
-	__asm__ __volatile__
-	  ("clrl %%d2\n\t"
-	   "trap #0\n\t"		/* Linux/m68k system call */
-	   "tstl %0\n\t"		/* child or parent */
-	   "jne 1f\n\t"			/* parent - jump */
-#ifdef CONFIG_MMU
-	   "lea %%sp@(%c7),%6\n\t"	/* reload current */
-	   "movel %6@,%6\n\t"
-#endif
-	   "movel %3,%%sp@-\n\t"	/* push argument */
-	   "jsr %4@\n\t"		/* call fn */
-	   "movel %0,%%d1\n\t"		/* pass exit value */
-	   "movel %2,%%d0\n\t"		/* exit */
-	   "trap #0\n"
-	   "1:"
-	   : "+d" (retval)
-	   : "i" (__NR_clone), "i" (__NR_exit),
-	     "r" (arg), "a" (fn), "d" (clone_arg), "r" (current),
-	     "i" (-THREAD_SIZE)
-	   : "d2");
-
-	pid = retval;
-	}
-
-	set_fs (fs);
-	return pid;
-}
-EXPORT_SYMBOL(kernel_thread);
-
 void flush_thread(void)
 {
 	current->thread.fs = __USER_DS;
@@ -216,30 +172,18 @@ asmlinkage int m68k_clone(struct pt_regs *regs)
 }
 
 int copy_thread(unsigned long clone_flags, unsigned long usp,
-		 unsigned long unused,
+		 unsigned long arg,
 		 struct task_struct * p, struct pt_regs * regs)
 {
 	struct pt_regs * childregs;
-	struct switch_stack * childstack, *stack;
-	unsigned long *retp;
+	struct switch_stack *childstack;
 
 	childregs = (struct pt_regs *) (task_stack_page(p) + THREAD_SIZE) - 1;
-
-	*childregs = *regs;
-	childregs->d0 = 0;
-
-	retp = ((unsigned long *) regs);
-	stack = ((struct switch_stack *) retp) - 1;
-
 	childstack = ((struct switch_stack *) childregs) - 1;
-	*childstack = *stack;
-	childstack->retpc = (unsigned long)ret_from_fork;
 
 	p->thread.usp = usp;
 	p->thread.ksp = (unsigned long)childstack;
-
-	if (clone_flags & CLONE_SETTLS)
-		task_thread_info(p)->tp_value = regs->d5;
+	p->thread.esp0 = (unsigned long)childregs;
 
 	/*
 	 * Must save the current SFC/DFC value, NOT the value when
@@ -247,6 +191,26 @@ int copy_thread(unsigned long clone_flags, unsigned long usp,
 	 */
 	p->thread.fs = get_fs().seg;
 
+	if (unlikely(!regs)) {
+		/* kernel thread */
+		memset(childstack, 0,
+			sizeof(struct switch_stack) + sizeof(struct pt_regs));
+		childregs->sr = PS_S;
+		childstack->a3 = usp; /* function */
+		childstack->d7 = arg;
+		childstack->retpc = (unsigned long)ret_from_kernel_thread;
+		p->thread.usp = 0;
+		return 0;
+	}
+	*childregs = *regs;
+	childregs->d0 = 0;
+
+	*childstack = ((struct switch_stack *) regs)[-1];
+	childstack->retpc = (unsigned long)ret_from_fork;
+
+	if (clone_flags & CLONE_SETTLS)
+		task_thread_info(p)->tp_value = regs->d5;
+
 #ifdef CONFIG_FPU
 	if (!FPU_IS_EMU) {
 		/* Copy the current fpu state */
-- 
cgit v1.2.3


From d878d6dacee2c862f02da20f7fa3e2c0e8820e71 Mon Sep 17 00:00:00 2001
From: Al Viro <viro@zeniv.linux.org.uk>
Date: Sun, 16 Sep 2012 12:06:34 -0400
Subject: m68k: switch to generic sys_execve()/kernel_execve()

The tricky part here is that task_pt_regs() on m68k works *only* for
process inside do_signal().  However, we need something much simpler -
pt_regs of a process inside do_signal() may be at different offsets
from the stack bottom, depending on the way we'd entered the kernel,
but for a task inside sys_execve() it *is* at constant offset.
Moreover, for a kernel thread about to become a userland process the
same location is also fine - setting sp to that will leave the kernel
stack pointer at the very bottom of the kernel stack when we finally
switch to userland.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
---
 arch/m68k/include/asm/ptrace.h |  2 ++
 arch/m68k/include/asm/unistd.h |  2 ++
 arch/m68k/kernel/entry.S       |  5 +++++
 arch/m68k/kernel/process.c     | 20 --------------------
 arch/m68k/kernel/sys_m68k.c    | 17 -----------------
 5 files changed, 9 insertions(+), 37 deletions(-)

diff --git a/arch/m68k/include/asm/ptrace.h b/arch/m68k/include/asm/ptrace.h
index 65322b17b6cf..5e08b597f012 100644
--- a/arch/m68k/include/asm/ptrace.h
+++ b/arch/m68k/include/asm/ptrace.h
@@ -85,6 +85,8 @@ struct switch_stack {
 #define user_mode(regs) (!((regs)->sr & PS_S))
 #define instruction_pointer(regs) ((regs)->pc)
 #define profile_pc(regs) instruction_pointer(regs)
+#define current_pt_regs() \
+	(struct pt_regs *)((char *)current_thread_info() + THREAD_SIZE) - 1
 
 #define arch_has_single_step()	(1)
 
diff --git a/arch/m68k/include/asm/unistd.h b/arch/m68k/include/asm/unistd.h
index 045cfd6a9e31..c702ad716791 100644
--- a/arch/m68k/include/asm/unistd.h
+++ b/arch/m68k/include/asm/unistd.h
@@ -382,6 +382,8 @@
 #define __ARCH_WANT_SYS_SIGPROCMASK
 #define __ARCH_WANT_SYS_RT_SIGACTION
 #define __ARCH_WANT_SYS_RT_SIGSUSPEND
+#define __ARCH_WANT_SYS_EXECVE
+#define __ARCH_WANT_KERNEL_EXECVE
 
 /*
  * "Conditional" syscalls
diff --git a/arch/m68k/kernel/entry.S b/arch/m68k/kernel/entry.S
index 8a01f580a024..946cb0187751 100644
--- a/arch/m68k/kernel/entry.S
+++ b/arch/m68k/kernel/entry.S
@@ -122,6 +122,11 @@ ENTRY(ret_from_kernel_thread)
 	movel	%d0,(%sp)
 	jra	sys_exit
 
+ENTRY(ret_from_kernel_execve)
+	movel	4(%sp), %sp
+	GET_CURRENT(%d0)
+	jra	ret_from_exception
+
 #if defined(CONFIG_COLDFIRE) || !defined(CONFIG_MMU)
 
 #ifdef TRAP_DBG_INTERRUPT
diff --git a/arch/m68k/kernel/process.c b/arch/m68k/kernel/process.c
index b3d4760c9750..4e54b4c03081 100644
--- a/arch/m68k/kernel/process.c
+++ b/arch/m68k/kernel/process.c
@@ -298,26 +298,6 @@ int dump_fpu (struct pt_regs *regs, struct user_m68kfp_struct *fpu)
 EXPORT_SYMBOL(dump_fpu);
 #endif /* CONFIG_FPU */
 
-/*
- * sys_execve() executes a new program.
- */
-asmlinkage int sys_execve(const char __user *name,
-			  const char __user *const __user *argv,
-			  const char __user *const __user *envp)
-{
-	int error;
-	char * filename;
-	struct pt_regs *regs = (struct pt_regs *) &name;
-
-	filename = getname(name);
-	error = PTR_ERR(filename);
-	if (IS_ERR(filename))
-		return error;
-	error = do_execve(filename, argv, envp, regs);
-	putname(filename);
-	return error;
-}
-
 unsigned long get_wchan(struct task_struct *p)
 {
 	unsigned long fp, pc;
diff --git a/arch/m68k/kernel/sys_m68k.c b/arch/m68k/kernel/sys_m68k.c
index 9a5932ec3689..3a480b3df0d6 100644
--- a/arch/m68k/kernel/sys_m68k.c
+++ b/arch/m68k/kernel/sys_m68k.c
@@ -549,23 +549,6 @@ asmlinkage int sys_getpagesize(void)
 	return PAGE_SIZE;
 }
 
-/*
- * Do a system call from kernel instead of calling sys_execve so we
- * end up with proper pt_regs.
- */
-int kernel_execve(const char *filename,
-		  const char *const argv[],
-		  const char *const envp[])
-{
-	register long __res asm ("%d0") = __NR_execve;
-	register long __a asm ("%d1") = (long)(filename);
-	register long __b asm ("%d2") = (long)(argv);
-	register long __c asm ("%d3") = (long)(envp);
-	asm volatile ("trap  #0" : "+d" (__res)
-			: "d" (__a), "d" (__b), "d" (__c));
-	return __res;
-}
-
 asmlinkage unsigned long sys_get_thread_area(void)
 {
 	return current_thread_info()->tp_value;
-- 
cgit v1.2.3


From 02ce496f152df87be081a64796498942c433a2fd Mon Sep 17 00:00:00 2001
From: Al Viro <viro@zeniv.linux.org.uk>
Date: Tue, 18 Sep 2012 22:18:51 -0400
Subject: frv: split ret_from_fork, simplify kernel_thread() a lot

Acked-by: David Howells <dhowells@redhat.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
---
 arch/frv/kernel/Makefile        |  2 +-
 arch/frv/kernel/entry.S         |  8 +++++
 arch/frv/kernel/frv_ksyms.c     |  1 -
 arch/frv/kernel/kernel_thread.S | 77 -----------------------------------------
 arch/frv/kernel/process.c       | 44 ++++++++++++-----------
 5 files changed, 32 insertions(+), 100 deletions(-)
 delete mode 100644 arch/frv/kernel/kernel_thread.S

diff --git a/arch/frv/kernel/Makefile b/arch/frv/kernel/Makefile
index ad4087b69968..7b10bc19106e 100644
--- a/arch/frv/kernel/Makefile
+++ b/arch/frv/kernel/Makefile
@@ -7,7 +7,7 @@ heads-$(CONFIG_MMU)		:= head-mmu-fr451.o
 
 extra-y:= head.o vmlinux.lds
 
-obj-y := $(heads-y) entry.o entry-table.o break.o switch_to.o kernel_thread.o \
+obj-y := $(heads-y) entry.o entry-table.o break.o switch_to.o \
 	 kernel_execve.o process.o traps.o ptrace.o signal.o dma.o \
 	 sys_frv.o time.o setup.o frv_ksyms.o \
 	 debug-stub.o irq.o sleep.o uaccess.o
diff --git a/arch/frv/kernel/entry.S b/arch/frv/kernel/entry.S
index 7d5e000fd32e..7a886130ca10 100644
--- a/arch/frv/kernel/entry.S
+++ b/arch/frv/kernel/entry.S
@@ -863,6 +863,14 @@ ret_from_fork:
 	setlos.p	#0,gr8
 	bra		__syscall_exit
 
+	.globl		ret_from_kernel_thread
+ret_from_kernel_thread:
+	lddi.p		@(gr28,#REG_GR(8)),gr20
+	call		schedule_tail
+	or.p		gr20,gr20,gr8
+	calll		@(gr21,gr0)
+	bra		sys_exit
+
 ###################################################################################################
 #
 # Return to user mode is not as complex as all this looks,
diff --git a/arch/frv/kernel/frv_ksyms.c b/arch/frv/kernel/frv_ksyms.c
index a89803b58b9a..86c516d96dcd 100644
--- a/arch/frv/kernel/frv_ksyms.c
+++ b/arch/frv/kernel/frv_ksyms.c
@@ -30,7 +30,6 @@ EXPORT_SYMBOL(ip_fast_csum);
 EXPORT_SYMBOL(local_irq_count);
 EXPORT_SYMBOL(local_bh_count);
 #endif
-EXPORT_SYMBOL(kernel_thread);
 
 EXPORT_SYMBOL(__res_bus_clock_speed_HZ);
 EXPORT_SYMBOL(__page_offset);
diff --git a/arch/frv/kernel/kernel_thread.S b/arch/frv/kernel/kernel_thread.S
deleted file mode 100644
index f0e52943f923..000000000000
--- a/arch/frv/kernel/kernel_thread.S
+++ /dev/null
@@ -1,77 +0,0 @@
-/* kernel_thread.S: kernel thread creation
- *
- * Copyright (C) 2003 Red Hat, Inc. All Rights Reserved.
- * Written by David Howells (dhowells@redhat.com)
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version
- * 2 of the License, or (at your option) any later version.
- */
-
-#include <linux/linkage.h>
-#include <linux/kern_levels.h>
-#include <asm/unistd.h>
-
-#define CLONE_VM	0x00000100	/* set if VM shared between processes */
-
-	.section .rodata
-kernel_thread_emsg:
-	.asciz	KERN_ERR "failed to create kernel thread: error=%d\n"
-
-	.text
-	.balign		4
-
-###############################################################################
-#
-# Create a kernel thread
-#
-# int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags)
-#
-###############################################################################
-	.globl		kernel_thread
-	.type		kernel_thread,@function
-kernel_thread:
-	or.p		gr8,gr0,gr4
-	or		gr9,gr0,gr5
-
-	# start by forking the current process, but with shared VM
-	setlos.p	#__NR_clone,gr7		; syscall number
-	ori		gr10,#CLONE_VM,gr8	; first syscall arg	[clone_flags]
-	sethi.p		#0xe4e4,gr9		; second syscall arg	[newsp]
-	setlo		#0xe4e4,gr9
-	setlos.p	#0,gr10			; third syscall arg	[parent_tidptr]
-	setlos		#0,gr11			; fourth syscall arg	[child_tidptr]
-	tira		gr0,#0
-	setlos.p	#4095,gr7
-	andcc		gr8,gr8,gr0,icc0
-	addcc.p		gr8,gr7,gr0,icc1
-	bnelr		icc0,#2
-	bc		icc1,#0,kernel_thread_error
-
-	# now invoke the work function
-	or		gr5,gr0,gr8
-	calll		@(gr4,gr0)
-
-	# and finally exit the thread
-	setlos		#__NR_exit,gr7		; syscall number
-	tira		gr0,#0
-
-kernel_thread_error:
-	subi		sp,#8,sp
-	movsg		lr,gr4
-	sti		gr8,@(sp,#0)
-	sti.p		gr4,@(sp,#4)
-
-	or		gr8,gr0,gr9
-	sethi.p		%hi(kernel_thread_emsg),gr8
-	setlo		%lo(kernel_thread_emsg),gr8
-
-	call		printk
-
-	ldi		@(sp,#4),gr4
-	ldi		@(sp,#0),gr8
-	subi		sp,#8,sp
-	jmpl		@(gr4,gr0)
-
-	.size		kernel_thread,.-kernel_thread
diff --git a/arch/frv/kernel/process.c b/arch/frv/kernel/process.c
index ff95f50efea5..0f02dee25e26 100644
--- a/arch/frv/kernel/process.c
+++ b/arch/frv/kernel/process.c
@@ -37,6 +37,7 @@
 #include "local.h"
 
 asmlinkage void ret_from_fork(void);
+asmlinkage void ret_from_kernel_thread(void);
 
 #include <asm/pgalloc.h>
 
@@ -172,29 +173,21 @@ int copy_thread(unsigned long clone_flags,
 		unsigned long usp, unsigned long topstk,
 		struct task_struct *p, struct pt_regs *regs)
 {
-	struct pt_regs *childregs0, *childregs, *regs0;
+	struct pt_regs *childregs;
 
-	regs0 = __kernel_frame0_ptr;
-	childregs0 = (struct pt_regs *)
+	childregs = (struct pt_regs *)
 		(task_stack_page(p) + THREAD_SIZE - FRV_FRAME0_SIZE);
-	childregs = childregs0;
 
 	/* set up the userspace frame (the only place that the USP is stored) */
-	*childregs0 = *regs0;
-
-	childregs0->gr8		= 0;
-	childregs0->sp		= usp;
-	childregs0->next_frame	= NULL;
-
-	/* set up the return kernel frame if called from kernel_thread() */
-	if (regs != regs0) {
-		childregs--;
-		*childregs = *regs;
-		childregs->sp = (unsigned long) childregs0;
-		childregs->next_frame = childregs0;
-		childregs->gr15 = (unsigned long) task_thread_info(p);
-		childregs->gr29 = (unsigned long) p;
-	}
+	*childregs = *regs;
+
+	childregs->sp		= usp;
+	childregs->next_frame	= NULL;
+
+	if (unlikely(!user_mode(regs)))
+		p->thread.pc = (unsigned long) ret_from_kernel_thread;
+	else
+		p->thread.pc = (unsigned long) ret_from_fork;
 
 	p->set_child_tid = p->clear_child_tid = NULL;
 
@@ -203,8 +196,7 @@ int copy_thread(unsigned long clone_flags,
 	p->thread.sp	 = (unsigned long) childregs;
 	p->thread.fp	 = 0;
 	p->thread.lr	 = 0;
-	p->thread.pc	 = (unsigned long) ret_from_fork;
-	p->thread.frame0 = childregs0;
+	p->thread.frame0 = childregs;
 
 	/* the new TLS pointer is passed in as arg #5 to sys_clone() */
 	if (clone_flags & CLONE_SETTLS)
@@ -347,3 +339,13 @@ int dump_fpu(struct pt_regs *regs, elf_fpregset_t *fpregs)
 	       sizeof(current->thread.user->f));
 	return 1;
 }
+
+int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags)
+{
+	struct pt_regs regs = {
+		.gr8 = (unsigned long)arg;
+		.gr9 = (unsigned long)fn;
+		.psr = PSR_S;
+	};
+	return do_fork(flags|CLONE_VM|CLONE_UNTRACED, 0, &regs, 0, NULL, NULL);
+}
-- 
cgit v1.2.3


From 460dabab73f2f60198c37ed7bf6d192d23eaa286 Mon Sep 17 00:00:00 2001
From: Al Viro <viro@zeniv.linux.org.uk>
Date: Tue, 18 Sep 2012 22:25:02 -0400
Subject: frv: switch to generic sys_execve()

current_pt_regs() here is simply __frame

Acked-by: David Howells <dhowells@redhat.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
---
 arch/frv/include/asm/ptrace.h |  1 +
 arch/frv/include/asm/unistd.h |  1 +
 arch/frv/kernel/process.c     | 19 -------------------
 3 files changed, 2 insertions(+), 19 deletions(-)

diff --git a/arch/frv/include/asm/ptrace.h b/arch/frv/include/asm/ptrace.h
index ef6635ca4ecb..bd534b2d0258 100644
--- a/arch/frv/include/asm/ptrace.h
+++ b/arch/frv/include/asm/ptrace.h
@@ -76,6 +76,7 @@ register struct pt_regs *__frame asm("gr28");
 #define user_mode(regs)			(!((regs)->psr & PSR_S))
 #define instruction_pointer(regs)	((regs)->pc)
 #define user_stack_pointer(regs)	((regs)->sp)
+#define current_pt_regs()		(__frame)
 
 extern unsigned long user_stack(const struct pt_regs *);
 #define profile_pc(regs) ((regs)->pc)
diff --git a/arch/frv/include/asm/unistd.h b/arch/frv/include/asm/unistd.h
index 67f23a311db6..24b64034866c 100644
--- a/arch/frv/include/asm/unistd.h
+++ b/arch/frv/include/asm/unistd.h
@@ -372,6 +372,7 @@
 #define __ARCH_WANT_SYS_SIGPROCMASK
 #define __ARCH_WANT_SYS_RT_SIGACTION
 #define __ARCH_WANT_SYS_RT_SIGSUSPEND
+#define __ARCH_WANT_SYS_EXECVE
 
 /*
  * "Conditional" syscalls
diff --git a/arch/frv/kernel/process.c b/arch/frv/kernel/process.c
index 0f02dee25e26..7ff4dbef0567 100644
--- a/arch/frv/kernel/process.c
+++ b/arch/frv/kernel/process.c
@@ -207,25 +207,6 @@ int copy_thread(unsigned long clone_flags,
 	return 0;
 } /* end copy_thread() */
 
-/*
- * sys_execve() executes a new program.
- */
-asmlinkage int sys_execve(const char __user *name,
-			  const char __user *const __user *argv,
-			  const char __user *const __user *envp)
-{
-	int error;
-	char * filename;
-
-	filename = getname(name);
-	error = PTR_ERR(filename);
-	if (IS_ERR(filename))
-		return error;
-	error = do_execve(filename, argv, envp, __frame);
-	putname(filename);
-	return error;
-}
-
 unsigned long get_wchan(struct task_struct *p)
 {
 	struct pt_regs *regs0;
-- 
cgit v1.2.3


From 019f96a345b6e23d4e0bc2c136ec5f7500b95834 Mon Sep 17 00:00:00 2001
From: Al Viro <viro@zeniv.linux.org.uk>
Date: Tue, 18 Sep 2012 22:33:44 -0400
Subject: frv: switch to generic kernel_execve

Acked-by: David Howells <dhowells@redhat.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
---
 arch/frv/include/asm/processor.h |  8 +++-----
 arch/frv/include/asm/unistd.h    |  1 +
 arch/frv/kernel/Makefile         |  2 +-
 arch/frv/kernel/entry.S          |  5 +++++
 arch/frv/kernel/kernel_execve.S  | 33 ---------------------------------
 5 files changed, 10 insertions(+), 39 deletions(-)
 delete mode 100644 arch/frv/kernel/kernel_execve.S

diff --git a/arch/frv/include/asm/processor.h b/arch/frv/include/asm/processor.h
index dccb9d162318..cc86e07a4119 100644
--- a/arch/frv/include/asm/processor.h
+++ b/arch/frv/include/asm/processor.h
@@ -92,14 +92,12 @@ extern struct task_struct *__kernel_current_task;
 
 /*
  * do necessary setup to start up a newly executed thread.
- * - need to discard the frame stacked by init() invoking the execve syscall
  */
 #define start_thread(_regs, _pc, _usp)			\
 do {							\
-	__frame = __kernel_frame0_ptr;			\
-	__frame->pc	= (_pc);			\
-	__frame->psr	&= ~PSR_S;			\
-	__frame->sp	= (_usp);			\
+	_regs->pc	= (_pc);			\
+	_regs->psr	&= ~PSR_S;			\
+	_regs->sp	= (_usp);			\
 } while(0)
 
 /* Free all resources held by a thread. */
diff --git a/arch/frv/include/asm/unistd.h b/arch/frv/include/asm/unistd.h
index 24b64034866c..b6b07e55e473 100644
--- a/arch/frv/include/asm/unistd.h
+++ b/arch/frv/include/asm/unistd.h
@@ -373,6 +373,7 @@
 #define __ARCH_WANT_SYS_RT_SIGACTION
 #define __ARCH_WANT_SYS_RT_SIGSUSPEND
 #define __ARCH_WANT_SYS_EXECVE
+#define __ARCH_WANT_KERNEL_EXECVE
 
 /*
  * "Conditional" syscalls
diff --git a/arch/frv/kernel/Makefile b/arch/frv/kernel/Makefile
index 7b10bc19106e..3cbb3294b9f9 100644
--- a/arch/frv/kernel/Makefile
+++ b/arch/frv/kernel/Makefile
@@ -8,7 +8,7 @@ heads-$(CONFIG_MMU)		:= head-mmu-fr451.o
 extra-y:= head.o vmlinux.lds
 
 obj-y := $(heads-y) entry.o entry-table.o break.o switch_to.o \
-	 kernel_execve.o process.o traps.o ptrace.o signal.o dma.o \
+	 process.o traps.o ptrace.o signal.o dma.o \
 	 sys_frv.o time.o setup.o frv_ksyms.o \
 	 debug-stub.o irq.o sleep.o uaccess.o
 
diff --git a/arch/frv/kernel/entry.S b/arch/frv/kernel/entry.S
index 7a886130ca10..002732960315 100644
--- a/arch/frv/kernel/entry.S
+++ b/arch/frv/kernel/entry.S
@@ -871,6 +871,11 @@ ret_from_kernel_thread:
 	calll		@(gr21,gr0)
 	bra		sys_exit
 
+	.globl		ret_from_kernel_execve
+ret_from_kernel_execve:
+	ori		gr28,0,sp
+	bra		__syscall_exit
+
 ###################################################################################################
 #
 # Return to user mode is not as complex as all this looks,
diff --git a/arch/frv/kernel/kernel_execve.S b/arch/frv/kernel/kernel_execve.S
deleted file mode 100644
index 9b074a16a052..000000000000
--- a/arch/frv/kernel/kernel_execve.S
+++ /dev/null
@@ -1,33 +0,0 @@
-/* in-kernel program execution
- *
- * Copyright (C) 2006 Red Hat, Inc. All Rights Reserved.
- * Written by David Howells (dhowells@redhat.com)
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version
- * 2 of the License, or (at your option) any later version.
- */
-
-#include <linux/linkage.h>
-#include <asm/unistd.h>
-
-###############################################################################
-#
-# Do a system call from kernel instead of calling sys_execve so we end up with
-# proper pt_regs.
-#
-# int kernel_execve(const char *filename, char *const argv[], char *const envp[])
-#
-# On entry: GR8/GR9/GR10: arguments to function
-# On return: GR8: syscall return.
-#
-###############################################################################
-	.globl		kernel_execve
-	.type		kernel_execve,@function
-kernel_execve:
-	setlos		__NR_execve,gr7
-	tira		gr0,#0
-	bralr
-
-	.size		kernel_execve,.-kernel_execve
-- 
cgit v1.2.3


From 49ed3398b75c98c087537a7d5a1a23f86a8c8746 Mon Sep 17 00:00:00 2001
From: Al Viro <viro@zeniv.linux.org.uk>
Date: Sat, 22 Sep 2012 18:10:15 -0400
Subject: frv: switch to generic kernel_thread()

---
 arch/frv/Kconfig                 |  1 +
 arch/frv/include/asm/processor.h |  1 -
 arch/frv/kernel/process.c        | 41 +++++++++++++++++++---------------------
 3 files changed, 20 insertions(+), 23 deletions(-)

diff --git a/arch/frv/Kconfig b/arch/frv/Kconfig
index 971c0a19facb..a27a1c6f8457 100644
--- a/arch/frv/Kconfig
+++ b/arch/frv/Kconfig
@@ -10,6 +10,7 @@ config FRV
 	select ARCH_HAVE_NMI_SAFE_CMPXCHG
 	select GENERIC_CPU_DEVICES
 	select ARCH_WANT_IPC_PARSE_VERSION
+	select GENERIC_KERNEL_THREAD
 
 config ZONE_DMA
 	bool
diff --git a/arch/frv/include/asm/processor.h b/arch/frv/include/asm/processor.h
index cc86e07a4119..a34f309e5801 100644
--- a/arch/frv/include/asm/processor.h
+++ b/arch/frv/include/asm/processor.h
@@ -105,7 +105,6 @@ static inline void release_thread(struct task_struct *dead_task)
 {
 }
 
-extern asmlinkage int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
 extern asmlinkage void save_user_regs(struct user_context *target);
 extern asmlinkage void *restore_user_regs(const struct user_context *target, ...);
 
diff --git a/arch/frv/kernel/process.c b/arch/frv/kernel/process.c
index 7ff4dbef0567..014f855362b9 100644
--- a/arch/frv/kernel/process.c
+++ b/arch/frv/kernel/process.c
@@ -170,7 +170,7 @@ asmlinkage int sys_clone(unsigned long clone_flags, unsigned long newsp,
  * set up the kernel stack and exception frames for a new process
  */
 int copy_thread(unsigned long clone_flags,
-		unsigned long usp, unsigned long topstk,
+		unsigned long usp, unsigned long arg,
 		struct task_struct *p, struct pt_regs *regs)
 {
 	struct pt_regs *childregs;
@@ -178,17 +178,6 @@ int copy_thread(unsigned long clone_flags,
 	childregs = (struct pt_regs *)
 		(task_stack_page(p) + THREAD_SIZE - FRV_FRAME0_SIZE);
 
-	/* set up the userspace frame (the only place that the USP is stored) */
-	*childregs = *regs;
-
-	childregs->sp		= usp;
-	childregs->next_frame	= NULL;
-
-	if (unlikely(!user_mode(regs)))
-		p->thread.pc = (unsigned long) ret_from_kernel_thread;
-	else
-		p->thread.pc = (unsigned long) ret_from_fork;
-
 	p->set_child_tid = p->clear_child_tid = NULL;
 
 	p->thread.frame	 = childregs;
@@ -198,6 +187,24 @@ int copy_thread(unsigned long clone_flags,
 	p->thread.lr	 = 0;
 	p->thread.frame0 = childregs;
 
+	if (unlikely(!regs)) {
+		memset(childregs, 0, sizeof(struct pt_regs));
+		childregs->gr9 = usp; /* function */
+		childregs->gr8 = arg;
+		chilregs->psr = PSR_S;
+		p->thread.pc = (unsigned long) ret_from_kernel_thread;
+		save_user_regs(p->thread.user);
+		return 0;
+	}
+
+	/* set up the userspace frame (the only place that the USP is stored) */
+	*childregs = *regs;
+
+	childregs->sp		= usp;
+	childregs->next_frame	= NULL;
+
+	p->thread.pc = (unsigned long) ret_from_fork;
+
 	/* the new TLS pointer is passed in as arg #5 to sys_clone() */
 	if (clone_flags & CLONE_SETTLS)
 		childregs->gr29 = childregs->gr12;
@@ -320,13 +327,3 @@ int dump_fpu(struct pt_regs *regs, elf_fpregset_t *fpregs)
 	       sizeof(current->thread.user->f));
 	return 1;
 }
-
-int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags)
-{
-	struct pt_regs regs = {
-		.gr8 = (unsigned long)arg;
-		.gr9 = (unsigned long)fn;
-		.psr = PSR_S;
-	};
-	return do_fork(flags|CLONE_VM|CLONE_UNTRACED, 0, &regs, 0, NULL, NULL);
-}
-- 
cgit v1.2.3


From 255461c53a91d34e2eddb8c8a2ba39e99065d7c1 Mon Sep 17 00:00:00 2001
From: Al Viro <viro@zeniv.linux.org.uk>
Date: Wed, 19 Sep 2012 13:05:49 -0400
Subject: mn10300: split ret_from_fork, simplify kernel_thread()

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
---
 arch/mn10300/kernel/Makefile   |  2 +-
 arch/mn10300/kernel/entry.S    |  7 ++++++
 arch/mn10300/kernel/internal.h |  6 +----
 arch/mn10300/kernel/kthread.S  | 31 -------------------------
 arch/mn10300/kernel/process.c  | 52 +++++++++++++++---------------------------
 5 files changed, 27 insertions(+), 71 deletions(-)
 delete mode 100644 arch/mn10300/kernel/kthread.S

diff --git a/arch/mn10300/kernel/Makefile b/arch/mn10300/kernel/Makefile
index d06749173d63..142c12906682 100644
--- a/arch/mn10300/kernel/Makefile
+++ b/arch/mn10300/kernel/Makefile
@@ -7,7 +7,7 @@ fpu-obj-y := fpu-nofpu.o fpu-nofpu-low.o
 fpu-obj-$(CONFIG_FPU) := fpu.o fpu-low.o
 
 obj-y   := process.o signal.o entry.o traps.o irq.o \
-	   ptrace.o setup.o time.o sys_mn10300.o io.o kthread.o \
+	   ptrace.o setup.o time.o sys_mn10300.o io.o \
 	   switch_to.o mn10300_ksyms.o kernel_execve.o $(fpu-obj-y) \
 	   csrc-mn10300.o cevt-mn10300.o
 
diff --git a/arch/mn10300/kernel/entry.S b/arch/mn10300/kernel/entry.S
index 8e11f9f48999..000f144230a5 100644
--- a/arch/mn10300/kernel/entry.S
+++ b/arch/mn10300/kernel/entry.S
@@ -55,6 +55,13 @@ ENTRY(ret_from_fork)
 	mov	d0,(REG_D0,fp)
 	jmp	syscall_exit
 
+ENTRY(ret_from_kernel_thread)
+	call	schedule_tail[],0
+	mov	(REG_D0,fp),d0
+	mov	(REG_A0,fp),a0
+	calls	(a0)
+	jmp	sys_exit
+
 ###############################################################################
 #
 # system call handler
diff --git a/arch/mn10300/kernel/internal.h b/arch/mn10300/kernel/internal.h
index 2df440105a80..561785581f6c 100644
--- a/arch/mn10300/kernel/internal.h
+++ b/arch/mn10300/kernel/internal.h
@@ -14,15 +14,11 @@
 struct clocksource;
 struct clock_event_device;
 
-/*
- * kthread.S
- */
-extern int kernel_thread_helper(int);
-
 /*
  * entry.S
  */
 extern void ret_from_fork(struct task_struct *) __attribute__((noreturn));
+extern void ret_from_kernel_thread(struct task_struct *) __attribute__((noreturn));
 
 /*
  * smp-low.S
diff --git a/arch/mn10300/kernel/kthread.S b/arch/mn10300/kernel/kthread.S
deleted file mode 100644
index b5ae467ac5ec..000000000000
--- a/arch/mn10300/kernel/kthread.S
+++ /dev/null
@@ -1,31 +0,0 @@
-/* MN10300 Kernel thread trampoline function
- *
- * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
- * Written by Mark Salter (msalter@redhat.com)
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public Licence
- * as published by the Free Software Foundation; either version
- * 2 of the Licence, or (at your option) any later version.
- */
-	.text
-
-###############################################################################
-#
-# kernel_thread_helper - trampoline for kernel_thread()
-#
-# On entry:
-#   A2 = address of function to call
-#   D2 = function argument
-#
-###############################################################################
-	.globl	kernel_thread_helper
-	.type	kernel_thread_helper,@function
-kernel_thread_helper:
-	mov	do_exit,d1
-	mov	d1,(sp)
-	mov	d1,mdr
-	mov	d2,d0
-	jmp	(a2)
-
-	.size	kernel_thread_helper,.-kernel_thread_helper
diff --git a/arch/mn10300/kernel/process.c b/arch/mn10300/kernel/process.c
index 7dab0cd36466..be87fbee4da5 100644
--- a/arch/mn10300/kernel/process.c
+++ b/arch/mn10300/kernel/process.c
@@ -166,13 +166,11 @@ void show_regs(struct pt_regs *regs)
  */
 int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags)
 {
-	struct pt_regs regs;
+	struct pt_regs regs = {
+		.a0 = (unsigned long) fn;
+		.d0 = (unsigned long) arg;
+	};
 
-	memset(&regs, 0, sizeof(regs));
-
-	regs.a2 = (unsigned long) fn;
-	regs.d2 = (unsigned long) arg;
-	regs.pc = (unsigned long) kernel_thread_helper;
 	local_save_flags(regs.epsw);
 	regs.epsw |= EPSW_IE | EPSW_IM_7;
 
@@ -180,7 +178,6 @@ int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags)
 	return do_fork(flags | CLONE_VM | CLONE_UNTRACED, 0, &regs, 0,
 		       NULL, NULL);
 }
-EXPORT_SYMBOL(kernel_thread);
 
 /*
  * free current thread data structures etc..
@@ -227,49 +224,36 @@ int copy_thread(unsigned long clone_flags,
 		struct task_struct *p, struct pt_regs *kregs)
 {
 	struct thread_info *ti = task_thread_info(p);
-	struct pt_regs *c_uregs, *c_kregs, *uregs;
+	struct pt_regs *c_regs;
 	unsigned long c_ksp;
 
-	uregs = current->thread.uregs;
-
 	c_ksp = (unsigned long) task_stack_page(p) + THREAD_SIZE;
 
 	/* allocate the userspace exception frame and set it up */
 	c_ksp -= sizeof(struct pt_regs);
-	c_uregs = (struct pt_regs *) c_ksp;
+	c_regs = (struct pt_regs *) c_ksp;
 
-	p->thread.uregs = c_uregs;
-	*c_uregs = *uregs;
-	c_uregs->sp = c_usp;
-	c_uregs->epsw &= ~EPSW_FE; /* my FPU */
+	p->thread.uregs = c_regs;
+	*c_regs = *kregs;
+	c_regs->sp = c_usp;
+	c_regs->epsw &= ~EPSW_FE; /* my FPU */
 
 	c_ksp -= 12; /* allocate function call ABI slack */
 
 	/* the new TLS pointer is passed in as arg #5 to sys_clone() */
 	if (clone_flags & CLONE_SETTLS)
-		c_uregs->e2 = current_frame()->d3;
-
-	/* set up the return kernel frame if called from kernel_thread() */
-	c_kregs = c_uregs;
-	if (kregs != uregs) {
-		c_ksp -= sizeof(struct pt_regs);
-		c_kregs = (struct pt_regs *) c_ksp;
-		*c_kregs = *kregs;
-		c_kregs->sp = c_usp;
-		c_kregs->next = c_uregs;
-#ifdef CONFIG_MN10300_CURRENT_IN_E2
-		c_kregs->e2 = (unsigned long) p; /* current */
-#endif
+		c_regs->e2 = current_frame()->d3;
 
-		c_ksp -= 12; /* allocate function call ABI slack */
-	}
+	if (unlikely(!user_mode(kregs)))
+		p->thread.pc	= (unsigned long) ret_from_kernel_thread;
+	else
+		p->thread.pc	= (unsigned long) ret_from_fork;
 
 	/* set up things up so the scheduler can start the new task */
-	ti->frame	= c_kregs;
-	p->thread.a3	= (unsigned long) c_kregs;
+	ti->frame	= c_regs;
+	p->thread.a3	= (unsigned long) c_regs;
 	p->thread.sp	= c_ksp;
-	p->thread.pc	= (unsigned long) ret_from_fork;
-	p->thread.wchan	= (unsigned long) ret_from_fork;
+	p->thread.wchan	= p->thread.pc;
 	p->thread.usp	= c_usp;
 
 	return 0;
-- 
cgit v1.2.3


From 8f1597e959a3cfeae8f5cfae26890710f9092443 Mon Sep 17 00:00:00 2001
From: Al Viro <viro@zeniv.linux.org.uk>
Date: Wed, 19 Sep 2012 13:08:13 -0400
Subject: mn10300: switch to generic sys_execve()

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
---
 arch/mn10300/include/asm/ptrace.h |  1 +
 arch/mn10300/include/asm/unistd.h |  1 +
 arch/mn10300/kernel/process.c     | 16 ----------------
 3 files changed, 2 insertions(+), 16 deletions(-)

diff --git a/arch/mn10300/include/asm/ptrace.h b/arch/mn10300/include/asm/ptrace.h
index 44251b974f1d..08ac856c053e 100644
--- a/arch/mn10300/include/asm/ptrace.h
+++ b/arch/mn10300/include/asm/ptrace.h
@@ -86,6 +86,7 @@ struct pt_regs {
 #define user_mode(regs)			(((regs)->epsw & EPSW_nSL) == EPSW_nSL)
 #define instruction_pointer(regs)	((regs)->pc)
 #define user_stack_pointer(regs)	((regs)->sp)
+#define current_pt_regs()		current_frame()
 
 #define arch_has_single_step()	(1)
 
diff --git a/arch/mn10300/include/asm/unistd.h b/arch/mn10300/include/asm/unistd.h
index 866eb14749d7..a965de47b2bd 100644
--- a/arch/mn10300/include/asm/unistd.h
+++ b/arch/mn10300/include/asm/unistd.h
@@ -382,6 +382,7 @@
 #define __ARCH_WANT_SYS_SIGPROCMASK
 #define __ARCH_WANT_SYS_RT_SIGACTION
 #define __ARCH_WANT_SYS_RT_SIGSUSPEND
+#define __ARCH_WANT_SYS_EXECVE
 
 /*
  * "Conditional" syscalls
diff --git a/arch/mn10300/kernel/process.c b/arch/mn10300/kernel/process.c
index be87fbee4da5..49af5ca89343 100644
--- a/arch/mn10300/kernel/process.c
+++ b/arch/mn10300/kernel/process.c
@@ -283,22 +283,6 @@ asmlinkage long sys_vfork(void)
 		       current_frame(), 0, NULL, NULL);
 }
 
-asmlinkage long sys_execve(const char __user *name,
-			   const char __user *const __user *argv,
-			   const char __user *const __user *envp)
-{
-	char *filename;
-	int error;
-
-	filename = getname(name);
-	error = PTR_ERR(filename);
-	if (IS_ERR(filename))
-		return error;
-	error = do_execve(filename, argv, envp, current_frame());
-	putname(filename);
-	return error;
-}
-
 unsigned long get_wchan(struct task_struct *p)
 {
 	return p->thread.wchan;
-- 
cgit v1.2.3


From 6e75421014cd02cc66298d35c4667e493da78914 Mon Sep 17 00:00:00 2001
From: Al Viro <viro@zeniv.linux.org.uk>
Date: Wed, 19 Sep 2012 13:18:20 -0400
Subject: mn10300: switch to generic kernel_execve()

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
---
 arch/mn10300/include/asm/frame.inc   |  2 +-
 arch/mn10300/include/asm/processor.h | 13 +++----------
 arch/mn10300/include/asm/unistd.h    |  1 +
 arch/mn10300/kernel/Makefile         |  2 +-
 arch/mn10300/kernel/entry.S          |  7 +++++++
 arch/mn10300/kernel/kernel_execve.S  | 37 ------------------------------------
 6 files changed, 13 insertions(+), 49 deletions(-)
 delete mode 100644 arch/mn10300/kernel/kernel_execve.S

diff --git a/arch/mn10300/include/asm/frame.inc b/arch/mn10300/include/asm/frame.inc
index 2ee58e3eb6b3..1c3eb4fda958 100644
--- a/arch/mn10300/include/asm/frame.inc
+++ b/arch/mn10300/include/asm/frame.inc
@@ -61,7 +61,7 @@
 ###############################################################################
 .macro RESTORE_ALL
 	# peel back the stack to the calling frame
-	# - this permits execve() to discard extra frames due to kernel syscalls
+	# - we need that when returning from interrupts to kernel mode
 	GET_THREAD_INFO a0
 	mov	(TI_frame,a0),fp
 	mov	fp,sp
diff --git a/arch/mn10300/include/asm/processor.h b/arch/mn10300/include/asm/processor.h
index 247928c9f549..0b844a254067 100644
--- a/arch/mn10300/include/asm/processor.h
+++ b/arch/mn10300/include/asm/processor.h
@@ -119,20 +119,13 @@ struct thread_struct {
 
 /*
  * do necessary setup to start up a newly executed thread
- * - need to discard the frame stacked by the kernel thread invoking the execve
- *   syscall (see RESTORE_ALL macro)
  */
 static inline void start_thread(struct pt_regs *regs,
 				unsigned long new_pc, unsigned long new_sp)
 {
-	struct thread_info *ti = current_thread_info();
-	struct pt_regs *frame0;
-
-	frame0 = thread_info_to_uregs(ti);
-	frame0->epsw = EPSW_nSL | EPSW_IE | EPSW_IM;
-	frame0->pc = new_pc;
-	frame0->sp = new_sp;
-	ti->frame = frame0;
+	regs->epsw = EPSW_nSL | EPSW_IE | EPSW_IM;
+	regs->pc = new_pc;
+	regs->sp = new_sp;
 }
 
 
diff --git a/arch/mn10300/include/asm/unistd.h b/arch/mn10300/include/asm/unistd.h
index a965de47b2bd..044c770adbb6 100644
--- a/arch/mn10300/include/asm/unistd.h
+++ b/arch/mn10300/include/asm/unistd.h
@@ -383,6 +383,7 @@
 #define __ARCH_WANT_SYS_RT_SIGACTION
 #define __ARCH_WANT_SYS_RT_SIGSUSPEND
 #define __ARCH_WANT_SYS_EXECVE
+#define __ARCH_WANT_KERNEL_EXECVE
 
 /*
  * "Conditional" syscalls
diff --git a/arch/mn10300/kernel/Makefile b/arch/mn10300/kernel/Makefile
index 142c12906682..561029f7fa44 100644
--- a/arch/mn10300/kernel/Makefile
+++ b/arch/mn10300/kernel/Makefile
@@ -8,7 +8,7 @@ fpu-obj-$(CONFIG_FPU) := fpu.o fpu-low.o
 
 obj-y   := process.o signal.o entry.o traps.o irq.o \
 	   ptrace.o setup.o time.o sys_mn10300.o io.o \
-	   switch_to.o mn10300_ksyms.o kernel_execve.o $(fpu-obj-y) \
+	   switch_to.o mn10300_ksyms.o $(fpu-obj-y) \
 	   csrc-mn10300.o cevt-mn10300.o
 
 obj-$(CONFIG_SMP) += smp.o smp-low.o
diff --git a/arch/mn10300/kernel/entry.S b/arch/mn10300/kernel/entry.S
index 000f144230a5..7dee5f6a1416 100644
--- a/arch/mn10300/kernel/entry.S
+++ b/arch/mn10300/kernel/entry.S
@@ -62,6 +62,13 @@ ENTRY(ret_from_kernel_thread)
 	calls	(a0)
 	jmp	sys_exit
 
+ENTRY(ret_from_kernel_execve)
+	add	-12,d0	/* pt_regs -> frame */
+	mov	d0,sp
+	GET_THREAD_INFO a2
+	clr	d0
+	jmp	syscall_exit
+
 ###############################################################################
 #
 # system call handler
diff --git a/arch/mn10300/kernel/kernel_execve.S b/arch/mn10300/kernel/kernel_execve.S
deleted file mode 100644
index 86039f105268..000000000000
--- a/arch/mn10300/kernel/kernel_execve.S
+++ /dev/null
@@ -1,37 +0,0 @@
-/* MN10300 In-kernel program execution
- *
- * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
- * Written by David Howells (dhowells@redhat.com)
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public Licence
- * as published by the Free Software Foundation; either version
- * 2 of the Licence, or (at your option) any later version.
- */
-#include <linux/linkage.h>
-#include <asm/unistd.h>
-
-###############################################################################
-#
-# Do a system call from kernel instead of calling sys_execve so we end up with
-# proper pt_regs.
-#
-# int kernel_execve(const char *filename, char *const argv[],
-#		    char *const envp[])
-#
-# On entry: D0/D1/8(SP): arguments to function
-# On return: D0: syscall return.
-#
-###############################################################################
-	.globl		kernel_execve
-	.type		kernel_execve,@function
-kernel_execve:
-	mov		a3,a1
-	mov		d0,a0
-	mov		(12,sp),a3
-	mov		+__NR_execve,d0
-	syscall		0
-	mov		a1,a3
-	rets
-
-	.size		kernel_execve,.-kernel_execve
-- 
cgit v1.2.3


From 61b7fbc3f4ebdcfd34f9438adfab8df936a19e33 Mon Sep 17 00:00:00 2001
From: Al Viro <viro@zeniv.linux.org.uk>
Date: Sat, 22 Sep 2012 18:18:23 -0400
Subject: mn10300: convert to generic kernel_thread()

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
---
 arch/mn10300/Kconfig                 |  1 +
 arch/mn10300/include/asm/processor.h |  5 ----
 arch/mn10300/kernel/process.c        | 49 +++++++++++++-----------------------
 3 files changed, 19 insertions(+), 36 deletions(-)

diff --git a/arch/mn10300/Kconfig b/arch/mn10300/Kconfig
index 5cfb086b3903..ddbdc33471a8 100644
--- a/arch/mn10300/Kconfig
+++ b/arch/mn10300/Kconfig
@@ -8,6 +8,7 @@ config MN10300
 	select HAVE_ARCH_KGDB
 	select HAVE_NMI_WATCHDOG if MN10300_WD_TIMER
 	select GENERIC_CLOCKEVENTS
+	select GENERIC_KERNEL_THREAD
 
 config AM33_2
 	def_bool n
diff --git a/arch/mn10300/include/asm/processor.h b/arch/mn10300/include/asm/processor.h
index 0b844a254067..8b80b19d0c8a 100644
--- a/arch/mn10300/include/asm/processor.h
+++ b/arch/mn10300/include/asm/processor.h
@@ -132,11 +132,6 @@ static inline void start_thread(struct pt_regs *regs,
 /* Free all resources held by a thread. */
 extern void release_thread(struct task_struct *);
 
-/*
- * create a kernel thread without removing it from tasklists
- */
-extern int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
-
 /*
  * Return saved PC of a blocked thread.
  */
diff --git a/arch/mn10300/kernel/process.c b/arch/mn10300/kernel/process.c
index 49af5ca89343..8ee09d828c43 100644
--- a/arch/mn10300/kernel/process.c
+++ b/arch/mn10300/kernel/process.c
@@ -161,24 +161,6 @@ void show_regs(struct pt_regs *regs)
 {
 }
 
-/*
- * create a kernel thread
- */
-int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags)
-{
-	struct pt_regs regs = {
-		.a0 = (unsigned long) fn;
-		.d0 = (unsigned long) arg;
-	};
-
-	local_save_flags(regs.epsw);
-	regs.epsw |= EPSW_IE | EPSW_IM_7;
-
-	/* Ok, create the new process.. */
-	return do_fork(flags | CLONE_VM | CLONE_UNTRACED, 0, &regs, 0,
-		       NULL, NULL);
-}
-
 /*
  * free current thread data structures etc..
  */
@@ -232,29 +214,34 @@ int copy_thread(unsigned long clone_flags,
 	/* allocate the userspace exception frame and set it up */
 	c_ksp -= sizeof(struct pt_regs);
 	c_regs = (struct pt_regs *) c_ksp;
+	c_ksp -= 12; /* allocate function call ABI slack */
 
+	/* set up things up so the scheduler can start the new task */
 	p->thread.uregs = c_regs;
+	ti->frame	= c_regs;
+	p->thread.a3	= (unsigned long) c_regs;
+	p->thread.sp	= c_ksp;
+	p->thread.wchan	= p->thread.pc;
+	p->thread.usp	= c_usp;
+
+	if (unlikely(!kregs)) {
+		memset(c_regs, 0, sizeof(struct pt_regs));
+		c_regs->a0 = c_usp; /* function */
+		c_regs->d0 = ustk_size; /* argument */
+		local_save_flags(c_regs->epsw);
+		c_regs->epsw |= EPSW_IE | EPSW_IM_7;
+		p->thread.pc	= (unsigned long) ret_from_kernel_thread;
+		return 0;
+	}
 	*c_regs = *kregs;
 	c_regs->sp = c_usp;
 	c_regs->epsw &= ~EPSW_FE; /* my FPU */
 
-	c_ksp -= 12; /* allocate function call ABI slack */
-
 	/* the new TLS pointer is passed in as arg #5 to sys_clone() */
 	if (clone_flags & CLONE_SETTLS)
 		c_regs->e2 = current_frame()->d3;
 
-	if (unlikely(!user_mode(kregs)))
-		p->thread.pc	= (unsigned long) ret_from_kernel_thread;
-	else
-		p->thread.pc	= (unsigned long) ret_from_fork;
-
-	/* set up things up so the scheduler can start the new task */
-	ti->frame	= c_regs;
-	p->thread.a3	= (unsigned long) c_regs;
-	p->thread.sp	= c_ksp;
-	p->thread.wchan	= p->thread.pc;
-	p->thread.usp	= c_usp;
+	p->thread.pc	= (unsigned long) ret_from_fork;
 
 	return 0;
 }
-- 
cgit v1.2.3


From 46f15067c020a0ce712cb2d3ef38c0589a521c15 Mon Sep 17 00:00:00 2001
From: Mark Salter <msalter@redhat.com>
Date: Fri, 21 Sep 2012 12:26:37 -0400
Subject: c6x: add ret_from_kernel_thread(), simplify kernel_thread()

Signed-off-by: Mark Salter <msalter@redhat.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
---
 arch/c6x/kernel/entry.S   | 20 ++++++++++++++++++++
 arch/c6x/kernel/process.c | 38 ++++++++++++--------------------------
 2 files changed, 32 insertions(+), 26 deletions(-)

diff --git a/arch/c6x/kernel/entry.S b/arch/c6x/kernel/entry.S
index 30b37e5f4a61..6e6bd9d3d9cc 100644
--- a/arch/c6x/kernel/entry.S
+++ b/arch/c6x/kernel/entry.S
@@ -400,6 +400,26 @@ ret_from_fork_2:
 	STW	.D2T2	B0,*+SP(REGS_A4+8)
 ENDPROC(ret_from_fork)
 
+ENTRY(ret_from_kernel_thread)
+#ifdef CONFIG_C6X_BIG_KERNEL
+	MVKL	.S1	schedule_tail,A0
+	MVKH	.S1	schedule_tail,A0
+	B	.S2X	A0
+#else
+	B	.S2	schedule_tail
+#endif
+	LDW	.D2T2	*+SP(REGS_A0+8),B10 /* get fn  */
+	ADDKPC	.S2	0f,B3,3
+0:
+	B	.S2	B10		   /* call fn */
+	LDW	.D2T1	*+SP(REGS_A1+8),A4 /* get arg */
+	MVKL	.S2	sys_exit,B11
+	MVKH	.S2	sys_exit,B11
+	ADDKPC	.S2	0f,B3,1
+0:
+	BNOP	.S2	B11,5	/* jump to sys_exit */
+ENDPROC(ret_from_kernel_thread)
+
 	;;
 	;; These are the interrupt handlers, responsible for calling __do_IRQ()
 	;; int6 is used for syscalls (see _system_call entry)
diff --git a/arch/c6x/kernel/process.c b/arch/c6x/kernel/process.c
index 45e924a636a0..d2ffc9bdaba1 100644
--- a/arch/c6x/kernel/process.c
+++ b/arch/c6x/kernel/process.c
@@ -25,6 +25,7 @@ void	(*c6x_restart)(void);
 void	(*c6x_halt)(void);
 
 extern asmlinkage void ret_from_fork(void);
+extern asmlinkage void ret_from_kernel_thread(void);
 
 /*
  * power off function, if any
@@ -103,36 +104,21 @@ void machine_power_off(void)
 	halt_loop();
 }
 
-static void kernel_thread_helper(int dummy, void *arg, int (*fn)(void *))
-{
-	do_exit(fn(arg));
-}
-
 /*
  * Create a kernel thread
  */
 int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags)
 {
-	struct pt_regs regs;
-
-	/*
-	 * copy_thread sets a4 to zero (child return from fork)
-	 * so we can't just set things up to directly return to
-	 * fn.
-	 */
-	memset(&regs, 0, sizeof(regs));
-	regs.b4 = (unsigned long) arg;
-	regs.a6 = (unsigned long) fn;
-	regs.pc = (unsigned long) kernel_thread_helper;
-	local_save_flags(regs.csr);
-	regs.csr |= 1;
-	regs.tsr = 5; /* Set GEE and GIE in TSR */
+	struct pt_regs regs = {
+		.a0 = (unsigned long)fn,
+		.a1 = (unsigned long)arg,
+		.tsr = 0, /* kernel mode */
+	};
 
 	/* Ok, create the new process.. */
 	return do_fork(flags | CLONE_VM | CLONE_UNTRACED, -1, &regs,
 		       0, NULL, NULL);
 }
-EXPORT_SYMBOL(kernel_thread);
 
 void flush_thread(void)
 {
@@ -192,21 +178,21 @@ int copy_thread(unsigned long clone_flags, unsigned long usp,
 	childregs = task_pt_regs(p);
 
 	*childregs = *regs;
-	childregs->a4 = 0;
 
-	if (usp == -1)
+	if (usp == -1) {
 		/* case of  __kernel_thread: we return to supervisor space */
 		childregs->sp = (unsigned long)(childregs + 1);
-	else
+		p->thread.pc = (unsigned long) ret_from_kernel_thread;
+	} else {
 		/* Otherwise use the given stack */
 		childregs->sp = usp;
+		p->thread.pc = (unsigned long) ret_from_fork;
+	}
 
 	/* Set usp/ksp */
 	p->thread.usp = childregs->sp;
-	/* switch_to uses stack to save/restore 14 callee-saved regs */
 	thread_saved_ksp(p) = (unsigned long)childregs - 8;
-	p->thread.pc = (unsigned int) ret_from_fork;
-	p->thread.wchan	= (unsigned long) ret_from_fork;
+	p->thread.wchan	= p->thread.pc;
 #ifdef __DSBT__
 	{
 		unsigned long dp;
-- 
cgit v1.2.3


From 39fcf44099dd64679c232c4a7bb81cf469e4e43c Mon Sep 17 00:00:00 2001
From: Mark Salter <msalter@redhat.com>
Date: Fri, 21 Sep 2012 12:26:38 -0400
Subject: c6x: switch to generic kernel_execve

Signed-off-by: Mark Salter <msalter@redhat.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
---
 arch/c6x/include/asm/unistd.h |  2 ++
 arch/c6x/kernel/entry.S       | 13 ++++++-------
 2 files changed, 8 insertions(+), 7 deletions(-)

diff --git a/arch/c6x/include/asm/unistd.h b/arch/c6x/include/asm/unistd.h
index 6d54ea4262eb..1ce3a6f2372b 100644
--- a/arch/c6x/include/asm/unistd.h
+++ b/arch/c6x/include/asm/unistd.h
@@ -16,6 +16,8 @@
 #if !defined(_ASM_C6X_UNISTD_H) || defined(__SYSCALL)
 #define _ASM_C6X_UNISTD_H
 
+#define __ARCH_WANT_KERNEL_EXECVE
+
 /* Use the standard ABI for syscalls. */
 #include <asm-generic/unistd.h>
 
diff --git a/arch/c6x/kernel/entry.S b/arch/c6x/kernel/entry.S
index 6e6bd9d3d9cc..32e3683da718 100644
--- a/arch/c6x/kernel/entry.S
+++ b/arch/c6x/kernel/entry.S
@@ -420,6 +420,12 @@ ENTRY(ret_from_kernel_thread)
 	BNOP	.S2	B11,5	/* jump to sys_exit */
 ENDPROC(ret_from_kernel_thread)
 
+ENTRY(ret_from_kernel_execve)
+	GET_THREAD_INFO A12
+	BNOP	.S2	syscall_exit,4
+	ADD	.D2X	A4,-8,SP
+ENDPROC(ret_from_kernel_execve)
+
 	;;
 	;; These are the interrupt handlers, responsible for calling __do_IRQ()
 	;; int6 is used for syscalls (see _system_call entry)
@@ -613,13 +619,6 @@ ENTRY(sys_sigaltstack)
 	NOP	4
 ENDPROC(sys_sigaltstack)
 
-	;; kernel_execve
-ENTRY(kernel_execve)
-	MVK	.S2	__NR_execve,B0
-	SWE
-	BNOP	.S2	B3,5
-ENDPROC(kernel_execve)
-
 	;;
 	;; Special system calls
 	;; return address is in B3
-- 
cgit v1.2.3


From 680a14535c330481517d3f95b2277353a14b8442 Mon Sep 17 00:00:00 2001
From: Mark Salter <msalter@redhat.com>
Date: Fri, 21 Sep 2012 12:26:39 -0400
Subject: c6x: switch to generic sys_execve

Signed-off-by: Mark Salter <msalter@redhat.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
---
 arch/c6x/include/asm/syscalls.h |  5 -----
 arch/c6x/include/asm/unistd.h   |  1 +
 arch/c6x/kernel/entry.S         | 23 -----------------------
 arch/c6x/kernel/process.c       | 22 ----------------------
 4 files changed, 1 insertion(+), 50 deletions(-)

diff --git a/arch/c6x/include/asm/syscalls.h b/arch/c6x/include/asm/syscalls.h
index aed53da703c9..e7b8991dc07c 100644
--- a/arch/c6x/include/asm/syscalls.h
+++ b/arch/c6x/include/asm/syscalls.h
@@ -44,11 +44,6 @@ extern int sys_cache_sync(unsigned long s, unsigned long e);
 struct pt_regs;
 
 extern asmlinkage long sys_c6x_clone(struct pt_regs *regs);
-extern asmlinkage long sys_c6x_execve(const char __user *name,
-				      const char __user *const __user *argv,
-				      const char __user *const __user *envp,
-				      struct pt_regs *regs);
-
 
 #include <asm-generic/syscalls.h>
 
diff --git a/arch/c6x/include/asm/unistd.h b/arch/c6x/include/asm/unistd.h
index 1ce3a6f2372b..3c131d5888c1 100644
--- a/arch/c6x/include/asm/unistd.h
+++ b/arch/c6x/include/asm/unistd.h
@@ -17,6 +17,7 @@
 #define _ASM_C6X_UNISTD_H
 
 #define __ARCH_WANT_KERNEL_EXECVE
+#define __ARCH_WANT_SYS_EXECVE
 
 /* Use the standard ABI for syscalls. */
 #include <asm-generic/unistd.h>
diff --git a/arch/c6x/kernel/entry.S b/arch/c6x/kernel/entry.S
index 32e3683da718..5449c36018fe 100644
--- a/arch/c6x/kernel/entry.S
+++ b/arch/c6x/kernel/entry.S
@@ -647,29 +647,6 @@ ENTRY(sys_rt_sigreturn)
 #endif
 ENDPROC(sys_rt_sigreturn)
 
-ENTRY(sys_execve)
-	ADDAW	.D2	SP,2,B6		; put regs addr in 4th parameter
-					; & adjust regs stack addr
-	LDW	.D2T2	*+SP(REGS_B4+8),B4
-
-	;; c6x_execve(char *name, char **argv,
-	;;            char **envp, struct pt_regs *regs)
-#ifdef CONFIG_C6X_BIG_KERNEL
- ||	MVKL	.S1	sys_c6x_execve,A0
-	MVKH	.S1	sys_c6x_execve,A0
-	B	.S2X	A0
-#else
- ||	B	.S2	sys_c6x_execve
-#endif
-	STW	.D2T2	B3,*SP--[2]
-	ADDKPC	.S2	ret_from_c6x_execve,B3,3
-
-ret_from_c6x_execve:
-	LDW	.D2T2	*++SP[2],B3
-	NOP	4
-	BNOP	.S2	B3,5
-ENDPROC(sys_execve)
-
 ENTRY(sys_pread_c6x)
 	MV	.D2X	A8,B7
 #ifdef CONFIG_C6X_BIG_KERNEL
diff --git a/arch/c6x/kernel/process.c b/arch/c6x/kernel/process.c
index d2ffc9bdaba1..f98616d92f2d 100644
--- a/arch/c6x/kernel/process.c
+++ b/arch/c6x/kernel/process.c
@@ -207,28 +207,6 @@ int copy_thread(unsigned long clone_flags, unsigned long usp,
 	return 0;
 }
 
-/*
- * c6x_execve() executes a new program.
- */
-SYSCALL_DEFINE4(c6x_execve, const char __user *, name,
-		const char __user *const __user *, argv,
-		const char __user *const __user *, envp,
-		struct pt_regs *, regs)
-{
-	int error;
-	char *filename;
-
-	filename = getname(name);
-	error = PTR_ERR(filename);
-	if (IS_ERR(filename))
-		goto out;
-
-	error = do_execve(filename, argv, envp, regs);
-	putname(filename);
-out:
-	return error;
-}
-
 unsigned long get_wchan(struct task_struct *p)
 {
 	return p->thread.wchan;
-- 
cgit v1.2.3


From 5687580bcb758ddc95be9894f592a65034e77401 Mon Sep 17 00:00:00 2001
From: Al Viro <viro@zeniv.linux.org.uk>
Date: Sat, 22 Sep 2012 18:23:49 -0400
Subject: c6x: switch to generic kernel_thread()

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
---
 arch/c6x/Kconfig                 |  1 +
 arch/c6x/include/asm/processor.h |  2 --
 arch/c6x/kernel/process.c        | 24 +++++-------------------
 3 files changed, 6 insertions(+), 21 deletions(-)

diff --git a/arch/c6x/Kconfig b/arch/c6x/Kconfig
index 983c859e40b7..45268b50c0c8 100644
--- a/arch/c6x/Kconfig
+++ b/arch/c6x/Kconfig
@@ -17,6 +17,7 @@ config C6X
 	select OF
 	select OF_EARLY_FLATTREE
 	select GENERIC_CLOCKEVENTS
+	select GENERIC_KERNEL_THREAD
 
 config MMU
 	def_bool n
diff --git a/arch/c6x/include/asm/processor.h b/arch/c6x/include/asm/processor.h
index c50af7ef1c96..b9eb3da7f278 100644
--- a/arch/c6x/include/asm/processor.h
+++ b/arch/c6x/include/asm/processor.h
@@ -92,8 +92,6 @@ static inline void release_thread(struct task_struct *dead_task)
 {
 }
 
-extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
-
 #define copy_segments(tsk, mm)		do { } while (0)
 #define release_segments(mm)		do { } while (0)
 
diff --git a/arch/c6x/kernel/process.c b/arch/c6x/kernel/process.c
index f98616d92f2d..2770d9a9a84e 100644
--- a/arch/c6x/kernel/process.c
+++ b/arch/c6x/kernel/process.c
@@ -104,22 +104,6 @@ void machine_power_off(void)
 	halt_loop();
 }
 
-/*
- * Create a kernel thread
- */
-int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags)
-{
-	struct pt_regs regs = {
-		.a0 = (unsigned long)fn,
-		.a1 = (unsigned long)arg,
-		.tsr = 0, /* kernel mode */
-	};
-
-	/* Ok, create the new process.. */
-	return do_fork(flags | CLONE_VM | CLONE_UNTRACED, -1, &regs,
-		       0, NULL, NULL);
-}
-
 void flush_thread(void)
 {
 }
@@ -177,14 +161,16 @@ int copy_thread(unsigned long clone_flags, unsigned long usp,
 
 	childregs = task_pt_regs(p);
 
-	*childregs = *regs;
-
-	if (usp == -1) {
+	if (!regs) {
 		/* case of  __kernel_thread: we return to supervisor space */
+		memset(childregs, 0, sizeof(struct pt_regs));
 		childregs->sp = (unsigned long)(childregs + 1);
 		p->thread.pc = (unsigned long) ret_from_kernel_thread;
+		childregs->a0 = usp;		/* function */
+		childregs->a1 = ustk_size;	/* argument */
 	} else {
 		/* Otherwise use the given stack */
+		*childregs = *regs;
 		childregs->sp = usp;
 		p->thread.pc = (unsigned long) ret_from_fork;
 	}
-- 
cgit v1.2.3


From 13d112ed32e66742a1795819b76752e8f7166848 Mon Sep 17 00:00:00 2001
From: Al Viro <viro@zeniv.linux.org.uk>
Date: Sat, 28 Apr 2012 22:42:43 -0400
Subject: xtensa: can't get to do_notify_resume() when user_mode(regs) is not
 true

asm glue checks that

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
---
 arch/xtensa/kernel/signal.c | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/arch/xtensa/kernel/signal.c b/arch/xtensa/kernel/signal.c
index efe4e854b3cd..0cbe67a2248a 100644
--- a/arch/xtensa/kernel/signal.c
+++ b/arch/xtensa/kernel/signal.c
@@ -527,9 +527,6 @@ static void do_signal(struct pt_regs *regs)
 
 void do_notify_resume(struct pt_regs *regs)
 {
-	if (!user_mode(regs))
-		return;
-
 	if (test_thread_flag(TIF_SIGPENDING))
 		do_signal(regs);
 
-- 
cgit v1.2.3


From 6fdb6fbecbf1ca939699f09376e35169615a3678 Mon Sep 17 00:00:00 2001
From: Al Viro <viro@zeniv.linux.org.uk>
Date: Mon, 30 Apr 2012 19:49:23 -0400
Subject: mn10300: get rid of calling do_notify_resume() when returning to
 kernel mode

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
---
 arch/mn10300/kernel/entry.S  | 4 ++++
 arch/mn10300/kernel/signal.c | 5 -----
 2 files changed, 4 insertions(+), 5 deletions(-)

diff --git a/arch/mn10300/kernel/entry.S b/arch/mn10300/kernel/entry.S
index 7dee5f6a1416..0c631d34c8d7 100644
--- a/arch/mn10300/kernel/entry.S
+++ b/arch/mn10300/kernel/entry.S
@@ -108,6 +108,10 @@ restore_all:
 ###############################################################################
 	ALIGN
 syscall_exit_work:
+	mov	(REG_EPSW,fp),d0
+	and	EPSW_nSL,d0
+	beq	resume_kernel		# returning to supervisor mode
+
 	btst	_TIF_SYSCALL_TRACE,d2
 	beq	work_pending
 	LOCAL_IRQ_ENABLE		# could let syscall_trace_exit() call
diff --git a/arch/mn10300/kernel/signal.c b/arch/mn10300/kernel/signal.c
index 4d584ae29ae1..b2c0ac715128 100644
--- a/arch/mn10300/kernel/signal.c
+++ b/arch/mn10300/kernel/signal.c
@@ -475,11 +475,6 @@ static void do_signal(struct pt_regs *regs)
 	siginfo_t info;
 	int signr;
 
-	/* we want the common case to go fast, which is why we may in certain
-	 * cases get here from kernel mode */
-	if (!user_mode(regs))
-		return;
-
 	signr = get_signal_to_deliver(&info, &ka, regs, NULL);
 	if (signr > 0) {
 		if (handle_signal(signr, &info, &ka, regs) == 0) {
-- 
cgit v1.2.3


From af445f45ed64fb0276c0f29bf30d7586e0b8d5f2 Mon Sep 17 00:00:00 2001
From: Al Viro <viro@zeniv.linux.org.uk>
Date: Mon, 30 Apr 2012 23:37:41 -0400
Subject: score: fix bogus restarts on sigreturn()

we *really* don't want to have restart logics hit when we are returning from
sigreturn() - random replacement of %r4 with -4 just because a signal had
been noticed from timer interrupt that came when %r4 happened to contain
-514 is not nice at all.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
---
 arch/score/kernel/signal.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/score/kernel/signal.c b/arch/score/kernel/signal.c
index e382c52ca0d9..c268bbf8b410 100644
--- a/arch/score/kernel/signal.c
+++ b/arch/score/kernel/signal.c
@@ -174,6 +174,7 @@ score_rt_sigreturn(struct pt_regs *regs)
 	/* It is more difficult to avoid calling this function than to
 	   call it and ignore errors.  */
 	do_sigaltstack((stack_t __user *)&st, NULL, regs->regs[0]);
+	regs->is_syscall = 0;
 
 	__asm__ __volatile__(
 		"mv\tr0, %0\n\t"
-- 
cgit v1.2.3


From cf880248c56495a5e616cde226d7c85972a3218c Mon Sep 17 00:00:00 2001
From: Al Viro <viro@zeniv.linux.org.uk>
Date: Tue, 1 May 2012 18:37:16 -0400
Subject: ia64: can't reach do_signal() when returning to kernel mode

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
---
 arch/ia64/kernel/signal.c | 8 --------
 1 file changed, 8 deletions(-)

diff --git a/arch/ia64/kernel/signal.c b/arch/ia64/kernel/signal.c
index a199be1fe619..19f89c09d40d 100644
--- a/arch/ia64/kernel/signal.c
+++ b/arch/ia64/kernel/signal.c
@@ -437,14 +437,6 @@ ia64_do_signal (struct sigscratch *scr, long in_syscall)
 	long restart = in_syscall;
 	long errno = scr->pt.r8;
 
-	/*
-	 * In the ia64_leave_kernel code path, we want the common case to go fast, which
-	 * is why we may in certain cases get here from kernel mode. Just return without
-	 * doing anything if so.
-	 */
-	if (!user_mode(&scr->pt))
-		return;
-
 	/*
 	 * This only loops in the rare cases of handle_signal() failing, in which case we
 	 * need to push through a forced SIGSEGV.
-- 
cgit v1.2.3


From bfc83647bbbb2aaf748a582ed7d45fb1408d4671 Mon Sep 17 00:00:00 2001
From: Al Viro <viro@zeniv.linux.org.uk>
Date: Wed, 2 May 2012 21:45:12 -0400
Subject: mips: prevent hitting do_notify_resume() with !user_mode(regs)

too late to do anything there...

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
---
 arch/mips/kernel/entry.S  | 3 +++
 arch/mips/kernel/signal.c | 8 --------
 2 files changed, 3 insertions(+), 8 deletions(-)

diff --git a/arch/mips/kernel/entry.S b/arch/mips/kernel/entry.S
index 37acfa036d44..4b0937f19862 100644
--- a/arch/mips/kernel/entry.S
+++ b/arch/mips/kernel/entry.S
@@ -167,6 +167,9 @@ work_notifysig:				# deal with pending signals and
 FEXPORT(syscall_exit_work_partial)
 	SAVE_STATIC
 syscall_exit_work:
+	LONG_L	t0, PT_STATUS(sp)		# returning to kernel mode?
+	andi	t0, t0, KU_USER
+	beqz	t0, resume_kernel
 	li	t0, _TIF_WORK_SYSCALL_EXIT
 	and	t0, a2			# a2 is preloaded with TI_FLAGS
 	beqz	t0, work_pending	# trace bit set?
diff --git a/arch/mips/kernel/signal.c b/arch/mips/kernel/signal.c
index f2c09cfc60ac..0e1a5b8ae817 100644
--- a/arch/mips/kernel/signal.c
+++ b/arch/mips/kernel/signal.c
@@ -560,14 +560,6 @@ static void do_signal(struct pt_regs *regs)
 	siginfo_t info;
 	int signr;
 
-	/*
-	 * We want the common case to go fast, which is why we may in certain
-	 * cases get here from kernel mode. Just return without doing anything
-	 * if so.
-	 */
-	if (!user_mode(regs))
-		return;
-
 	signr = get_signal_to_deliver(&info, &ka, regs, NULL);
 	if (signr > 0) {
 		/* Whee!  Actually deliver the signal.  */
-- 
cgit v1.2.3


From f925725d91895fe6ca293c6838cc8bd821488fcf Mon Sep 17 00:00:00 2001
From: Al Viro <viro@zeniv.linux.org.uk>
Date: Sat, 5 May 2012 15:57:00 -0400
Subject: mips: unobfuscate _TIF..._MASK

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
---
 arch/mips/include/asm/thread_info.h | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/arch/mips/include/asm/thread_info.h b/arch/mips/include/asm/thread_info.h
index ca97e0ecb64b..6bd02dbba452 100644
--- a/arch/mips/include/asm/thread_info.h
+++ b/arch/mips/include/asm/thread_info.h
@@ -139,10 +139,11 @@ register struct thread_info *__current_thread_info __asm__("$28");
 #define _TIF_WORK_SYSCALL_EXIT	(_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT)
 
 /* work to do on interrupt/exception return */
-#define _TIF_WORK_MASK		(0x0000ffef &				\
-					~(_TIF_SECCOMP | _TIF_SYSCALL_AUDIT))
+#define _TIF_WORK_MASK		\
+	(_TIF_SIGPENDING | _TIF_NEED_RESCHED | _TIF_NOTIFY_RESUME | \
+	 _TIF_RESTORE_SIGMASK)
 /* work to do on any return to u-space */
-#define _TIF_ALLWORK_MASK	(0x8000ffff & ~_TIF_SECCOMP)
+#define _TIF_ALLWORK_MASK	(_TIF_WORK_MASK | _TIF_WORK_SYSCALL_EXIT)
 
 #endif /* __KERNEL__ */
 
-- 
cgit v1.2.3


From 45111b5398fd500a14b6048a347c37f3f959945a Mon Sep 17 00:00:00 2001
From: Al Viro <viro@zeniv.linux.org.uk>
Date: Sat, 5 May 2012 16:11:35 -0400
Subject: mips: merge the identical "return from syscall" per-ABI code

No need to keep 4 copies of that stuff; merged and taken to
entry.S, unused public symbols there killed off.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
---
 arch/mips/kernel/entry.S       | 12 +++++++++---
 arch/mips/kernel/scall32-o32.S | 13 +------------
 arch/mips/kernel/scall64-64.S  | 13 +------------
 arch/mips/kernel/scall64-n32.S | 13 +------------
 arch/mips/kernel/scall64-o32.S | 13 +------------
 5 files changed, 13 insertions(+), 51 deletions(-)

diff --git a/arch/mips/kernel/entry.S b/arch/mips/kernel/entry.S
index 4b0937f19862..a6c133212003 100644
--- a/arch/mips/kernel/entry.S
+++ b/arch/mips/kernel/entry.S
@@ -77,7 +77,7 @@ FEXPORT(syscall_exit)
 	and	t0, a2, t0
 	bnez	t0, syscall_exit_work
 
-FEXPORT(restore_all)			# restore full frame
+restore_all:				# restore full frame
 #ifdef CONFIG_MIPS_MT_SMTC
 #ifdef CONFIG_MIPS_MT_SMTC_IM_BACKSTOP
 /* Re-arm any temporarily masked interrupts not explicitly "acked" */
@@ -117,7 +117,7 @@ FEXPORT(restore_all)			# restore full frame
 	RESTORE_TEMP
 	RESTORE_AT
 	RESTORE_STATIC
-FEXPORT(restore_partial)		# restore partial frame
+restore_partial:		# restore partial frame
 #ifdef CONFIG_TRACE_IRQFLAGS
 	SAVE_STATIC
 	SAVE_AT
@@ -164,7 +164,13 @@ work_notifysig:				# deal with pending signals and
 	jal	do_notify_resume	# a2 already loaded
 	j	resume_userspace
 
-FEXPORT(syscall_exit_work_partial)
+FEXPORT(syscall_exit_partial)
+	local_irq_disable		# make sure need_resched doesn't
+					# change between and return
+	LONG_L	a2, TI_FLAGS($28)	# current->work
+	li	t0, _TIF_ALLWORK_MASK
+	and	t0, a2
+	beqz	t0, restore_partial
 	SAVE_STATIC
 syscall_exit_work:
 	LONG_L	t0, PT_STATUS(sp)		# returning to kernel mode?
diff --git a/arch/mips/kernel/scall32-o32.S b/arch/mips/kernel/scall32-o32.S
index a632bc144efa..dfd47dcbd96c 100644
--- a/arch/mips/kernel/scall32-o32.S
+++ b/arch/mips/kernel/scall32-o32.S
@@ -69,18 +69,7 @@ stack_done:
 1:	sw	v0, PT_R2(sp)		# result
 
 o32_syscall_exit:
-	local_irq_disable		# make sure need_resched and
-					# signals dont change between
-					# sampling and return
-	lw	a2, TI_FLAGS($28)	# current->work
-	li	t0, _TIF_ALLWORK_MASK
-	and	t0, a2
-	bnez	t0, o32_syscall_exit_work
-
-	j	restore_partial
-
-o32_syscall_exit_work:
-	j	syscall_exit_work_partial
+	j	syscall_exit_partial
 
 /* ------------------------------------------------------------------------ */
 
diff --git a/arch/mips/kernel/scall64-64.S b/arch/mips/kernel/scall64-64.S
index 3b5a5e9ae49c..b83dc8b2832c 100644
--- a/arch/mips/kernel/scall64-64.S
+++ b/arch/mips/kernel/scall64-64.S
@@ -72,18 +72,7 @@ NESTED(handle_sys64, PT_SIZE, sp)
 1:	sd	v0, PT_R2(sp)		# result
 
 n64_syscall_exit:
-	local_irq_disable		# make sure need_resched and
-					# signals dont change between
-					# sampling and return
-	LONG_L	a2, TI_FLAGS($28)	# current->work
-	li	t0, _TIF_ALLWORK_MASK
-	and	t0, a2, t0
-	bnez	t0, n64_syscall_exit_work
-
-	j	restore_partial
-
-n64_syscall_exit_work:
-	j	syscall_exit_work_partial
+	j	syscall_exit_partial
 
 /* ------------------------------------------------------------------------ */
 
diff --git a/arch/mips/kernel/scall64-n32.S b/arch/mips/kernel/scall64-n32.S
index 6be6f7020923..0cff8a30475e 100644
--- a/arch/mips/kernel/scall64-n32.S
+++ b/arch/mips/kernel/scall64-n32.S
@@ -70,18 +70,7 @@ NESTED(handle_sysn32, PT_SIZE, sp)
 	sd	t1, PT_R0(sp)		# save it for syscall restarting
 1:	sd	v0, PT_R2(sp)		# result
 
-	local_irq_disable		# make sure need_resched and
-					# signals dont change between
-					# sampling and return
-	LONG_L  a2, TI_FLAGS($28)	# current->work
-	li	t0, _TIF_ALLWORK_MASK
-	and	t0, a2, t0
-	bnez	t0, n32_syscall_exit_work
-
-	j	restore_partial
-
-n32_syscall_exit_work:
-	j	syscall_exit_work_partial
+	j	syscall_exit_partial
 
 /* ------------------------------------------------------------------------ */
 
diff --git a/arch/mips/kernel/scall64-o32.S b/arch/mips/kernel/scall64-o32.S
index 54228553691d..9b040e4b84d4 100644
--- a/arch/mips/kernel/scall64-o32.S
+++ b/arch/mips/kernel/scall64-o32.S
@@ -99,18 +99,7 @@ NESTED(handle_sys, PT_SIZE, sp)
 1:	sd	v0, PT_R2(sp)		# result
 
 o32_syscall_exit:
-	local_irq_disable		# make need_resched and
-					# signals dont change between
-					# sampling and return
-	LONG_L	a2, TI_FLAGS($28)
-	li	t0, _TIF_ALLWORK_MASK
-	and	t0, a2, t0
-	bnez	t0, o32_syscall_exit_work
-
-	j	restore_partial
-
-o32_syscall_exit_work:
-	j	syscall_exit_work_partial
+	j	syscall_exit_partial
 
 /* ------------------------------------------------------------------------ */
 
-- 
cgit v1.2.3


From ac19fe5bf1db7a6fda2d7c5a92df08083f184c08 Mon Sep 17 00:00:00 2001
From: Al Viro <viro@zeniv.linux.org.uk>
Date: Sat, 5 May 2012 16:24:40 -0400
Subject: mips: NOTIFY_RESUME is not needed in TIF masks

If it's set, SIGPENDING is also set.  And SIGPENDING is present in
the masks...

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
---
 arch/mips/include/asm/thread_info.h | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/arch/mips/include/asm/thread_info.h b/arch/mips/include/asm/thread_info.h
index 6bd02dbba452..946e010f2018 100644
--- a/arch/mips/include/asm/thread_info.h
+++ b/arch/mips/include/asm/thread_info.h
@@ -140,8 +140,7 @@ register struct thread_info *__current_thread_info __asm__("$28");
 
 /* work to do on interrupt/exception return */
 #define _TIF_WORK_MASK		\
-	(_TIF_SIGPENDING | _TIF_NEED_RESCHED | _TIF_NOTIFY_RESUME | \
-	 _TIF_RESTORE_SIGMASK)
+	(_TIF_SIGPENDING | _TIF_NEED_RESCHED | _TIF_NOTIFY_RESUME)
 /* work to do on any return to u-space */
 #define _TIF_ALLWORK_MASK	(_TIF_WORK_MASK | _TIF_WORK_SYSCALL_EXIT)
 
-- 
cgit v1.2.3


From 87b0e714dee438309efca998616a2dbb064ca1a0 Mon Sep 17 00:00:00 2001
From: Al Viro <viro@zeniv.linux.org.uk>
Date: Sat, 5 May 2012 18:29:41 -0400
Subject: unicore32: unobfuscate _TIF_WORK_MASK

bits 3..7 in flags are never set there, so this 0xff is pointless

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
---
 arch/unicore32/include/asm/thread_info.h | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/unicore32/include/asm/thread_info.h b/arch/unicore32/include/asm/thread_info.h
index 89f7557583b8..bf1c3e01197b 100644
--- a/arch/unicore32/include/asm/thread_info.h
+++ b/arch/unicore32/include/asm/thread_info.h
@@ -146,7 +146,8 @@ static inline struct thread_info *current_thread_info(void)
 /*
  * Change these and you break ASM code in entry-common.S
  */
-#define _TIF_WORK_MASK		0x000000ff
+#define _TIF_WORK_MASK \
+	(_TIF_SIGPENDING | _TIF_NEED_RESCHED | _TIF_NOTIFY_RESUME)
 
 #endif /* __KERNEL__ */
 #endif /* __UNICORE_THREAD_INFO_H__ */
-- 
cgit v1.2.3


From 8af4efac26e1805c76144ad44118157239308d35 Mon Sep 17 00:00:00 2001
From: Al Viro <viro@zeniv.linux.org.uk>
Date: Fri, 1 Jun 2012 14:21:16 -0400
Subject: bury _TIF_RESTORE_SIGMASK

never used...

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
---
 arch/alpha/include/asm/thread_info.h     | 1 -
 arch/avr32/include/asm/thread_info.h     | 1 -
 arch/blackfin/include/asm/thread_info.h  | 1 -
 arch/cris/include/asm/thread_info.h      | 1 -
 arch/frv/include/asm/thread_info.h       | 1 -
 arch/h8300/include/asm/thread_info.h     | 1 -
 arch/hexagon/include/asm/thread_info.h   | 1 -
 arch/m32r/include/asm/thread_info.h      | 1 -
 arch/mips/include/asm/thread_info.h      | 1 -
 arch/mn10300/include/asm/thread_info.h   | 1 -
 arch/openrisc/include/asm/thread_info.h  | 1 -
 arch/parisc/include/asm/thread_info.h    | 1 -
 arch/s390/include/asm/thread_info.h      | 1 -
 arch/score/include/asm/thread_info.h     | 1 -
 arch/sparc/include/asm/thread_info_32.h  | 1 -
 arch/unicore32/include/asm/thread_info.h | 1 -
 arch/xtensa/include/asm/thread_info.h    | 1 -
 17 files changed, 17 deletions(-)

diff --git a/arch/alpha/include/asm/thread_info.h b/arch/alpha/include/asm/thread_info.h
index 28335bd40e40..2601c8e338da 100644
--- a/arch/alpha/include/asm/thread_info.h
+++ b/arch/alpha/include/asm/thread_info.h
@@ -84,7 +84,6 @@ register struct thread_info *__current_thread_info __asm__("$8");
 #define _TIF_SIGPENDING		(1<<TIF_SIGPENDING)
 #define _TIF_NEED_RESCHED	(1<<TIF_NEED_RESCHED)
 #define _TIF_POLLING_NRFLAG	(1<<TIF_POLLING_NRFLAG)
-#define _TIF_RESTORE_SIGMASK	(1<<TIF_RESTORE_SIGMASK)
 #define _TIF_NOTIFY_RESUME	(1<<TIF_NOTIFY_RESUME)
 
 /* Work to do on interrupt/exception return.  */
diff --git a/arch/avr32/include/asm/thread_info.h b/arch/avr32/include/asm/thread_info.h
index e5deda4691db..a32c88cb2601 100644
--- a/arch/avr32/include/asm/thread_info.h
+++ b/arch/avr32/include/asm/thread_info.h
@@ -94,7 +94,6 @@ static inline struct thread_info *current_thread_info(void)
 #define _TIF_POLLING_NRFLAG	(1 << TIF_POLLING_NRFLAG)
 #define _TIF_SINGLE_STEP	(1 << TIF_SINGLE_STEP)
 #define _TIF_MEMDIE		(1 << TIF_MEMDIE)
-#define _TIF_RESTORE_SIGMASK	(1 << TIF_RESTORE_SIGMASK)
 #define _TIF_CPU_GOING_TO_SLEEP (1 << TIF_CPU_GOING_TO_SLEEP)
 #define _TIF_NOTIFY_RESUME	(1 << TIF_NOTIFY_RESUME)
 
diff --git a/arch/blackfin/include/asm/thread_info.h b/arch/blackfin/include/asm/thread_info.h
index 53ad10005ae3..f9a8731b7e81 100644
--- a/arch/blackfin/include/asm/thread_info.h
+++ b/arch/blackfin/include/asm/thread_info.h
@@ -109,7 +109,6 @@ static inline struct thread_info *current_thread_info(void)
 #define _TIF_SIGPENDING		(1<<TIF_SIGPENDING)
 #define _TIF_NEED_RESCHED	(1<<TIF_NEED_RESCHED)
 #define _TIF_POLLING_NRFLAG	(1<<TIF_POLLING_NRFLAG)
-#define _TIF_RESTORE_SIGMASK	(1<<TIF_RESTORE_SIGMASK)
 #define _TIF_IRQ_SYNC		(1<<TIF_IRQ_SYNC)
 #define _TIF_NOTIFY_RESUME	(1<<TIF_NOTIFY_RESUME)
 #define _TIF_SINGLESTEP		(1<<TIF_SINGLESTEP)
diff --git a/arch/cris/include/asm/thread_info.h b/arch/cris/include/asm/thread_info.h
index 5b1c448df5c0..0e0b52d3e22a 100644
--- a/arch/cris/include/asm/thread_info.h
+++ b/arch/cris/include/asm/thread_info.h
@@ -85,7 +85,6 @@ struct thread_info {
 #define _TIF_NOTIFY_RESUME	(1<<TIF_NOTIFY_RESUME)
 #define _TIF_SIGPENDING		(1<<TIF_SIGPENDING)
 #define _TIF_NEED_RESCHED	(1<<TIF_NEED_RESCHED)
-#define _TIF_RESTORE_SIGMASK	(1<<TIF_RESTORE_SIGMASK)
 #define _TIF_POLLING_NRFLAG	(1<<TIF_POLLING_NRFLAG)
 
 #define _TIF_WORK_MASK		0x0000FFFE	/* work to do on interrupt/exception return */
diff --git a/arch/frv/include/asm/thread_info.h b/arch/frv/include/asm/thread_info.h
index 0ff03a33c81e..5108ede011a5 100644
--- a/arch/frv/include/asm/thread_info.h
+++ b/arch/frv/include/asm/thread_info.h
@@ -102,7 +102,6 @@ register struct thread_info *__current_thread_info asm("gr15");
 #define _TIF_SIGPENDING		(1 << TIF_SIGPENDING)
 #define _TIF_NEED_RESCHED	(1 << TIF_NEED_RESCHED)
 #define _TIF_SINGLESTEP		(1 << TIF_SINGLESTEP)
-#define _TIF_RESTORE_SIGMASK	(1 << TIF_RESTORE_SIGMASK)
 #define _TIF_POLLING_NRFLAG	(1 << TIF_POLLING_NRFLAG)
 
 /* work to do on interrupt/exception return */
diff --git a/arch/h8300/include/asm/thread_info.h b/arch/h8300/include/asm/thread_info.h
index 9c126e0c09aa..aa0406bf0206 100644
--- a/arch/h8300/include/asm/thread_info.h
+++ b/arch/h8300/include/asm/thread_info.h
@@ -96,7 +96,6 @@ static inline struct thread_info *current_thread_info(void)
 #define _TIF_SIGPENDING		(1<<TIF_SIGPENDING)
 #define _TIF_NEED_RESCHED	(1<<TIF_NEED_RESCHED)
 #define _TIF_POLLING_NRFLAG	(1<<TIF_POLLING_NRFLAG)
-#define _TIF_RESTORE_SIGMASK	(1<<TIF_RESTORE_SIGMASK)
 #define _TIF_NOTIFY_RESUME	(1 << TIF_NOTIFY_RESUME)
 
 #define _TIF_WORK_MASK		0x0000FFFE	/* work to do on interrupt/exception return */
diff --git a/arch/hexagon/include/asm/thread_info.h b/arch/hexagon/include/asm/thread_info.h
index 4f936a7ee847..b5a6d43411c0 100644
--- a/arch/hexagon/include/asm/thread_info.h
+++ b/arch/hexagon/include/asm/thread_info.h
@@ -132,7 +132,6 @@ register struct thread_info *__current_thread_info asm(QUOTED_THREADINFO_REG);
 #define _TIF_NEED_RESCHED       (1 << TIF_NEED_RESCHED)
 #define _TIF_SINGLESTEP         (1 << TIF_SINGLESTEP)
 #define _TIF_IRET               (1 << TIF_IRET)
-#define _TIF_RESTORE_SIGMASK    (1 << TIF_RESTORE_SIGMASK)
 #define _TIF_POLLING_NRFLAG     (1 << TIF_POLLING_NRFLAG)
 
 /* work to do on interrupt/exception return - All but TIF_SYSCALL_TRACE */
diff --git a/arch/m32r/include/asm/thread_info.h b/arch/m32r/include/asm/thread_info.h
index c083f6073ef4..18b058457d31 100644
--- a/arch/m32r/include/asm/thread_info.h
+++ b/arch/m32r/include/asm/thread_info.h
@@ -132,7 +132,6 @@ static inline unsigned int get_thread_fault_code(void)
 #define _TIF_SINGLESTEP		(1<<TIF_SINGLESTEP)
 #define _TIF_IRET		(1<<TIF_IRET)
 #define _TIF_NOTIFY_RESUME	(1<<TIF_NOTIFY_RESUME)
-#define _TIF_RESTORE_SIGMASK	(1<<TIF_RESTORE_SIGMASK)
 #define _TIF_USEDFPU		(1<<TIF_USEDFPU)
 #define _TIF_POLLING_NRFLAG	(1<<TIF_POLLING_NRFLAG)
 
diff --git a/arch/mips/include/asm/thread_info.h b/arch/mips/include/asm/thread_info.h
index 946e010f2018..a75a11abf7b0 100644
--- a/arch/mips/include/asm/thread_info.h
+++ b/arch/mips/include/asm/thread_info.h
@@ -125,7 +125,6 @@ register struct thread_info *__current_thread_info __asm__("$28");
 #define _TIF_SYSCALL_AUDIT	(1<<TIF_SYSCALL_AUDIT)
 #define _TIF_SECCOMP		(1<<TIF_SECCOMP)
 #define _TIF_NOTIFY_RESUME	(1<<TIF_NOTIFY_RESUME)
-#define _TIF_RESTORE_SIGMASK	(1<<TIF_RESTORE_SIGMASK)
 #define _TIF_USEDFPU		(1<<TIF_USEDFPU)
 #define _TIF_POLLING_NRFLAG	(1<<TIF_POLLING_NRFLAG)
 #define _TIF_FIXADE		(1<<TIF_FIXADE)
diff --git a/arch/mn10300/include/asm/thread_info.h b/arch/mn10300/include/asm/thread_info.h
index ac519bbd42ff..224b4262486d 100644
--- a/arch/mn10300/include/asm/thread_info.h
+++ b/arch/mn10300/include/asm/thread_info.h
@@ -160,7 +160,6 @@ void arch_release_thread_info(struct thread_info *ti);
 #define _TIF_SIGPENDING		+(1 << TIF_SIGPENDING)
 #define _TIF_NEED_RESCHED	+(1 << TIF_NEED_RESCHED)
 #define _TIF_SINGLESTEP		+(1 << TIF_SINGLESTEP)
-#define _TIF_RESTORE_SIGMASK	+(1 << TIF_RESTORE_SIGMASK)
 #define _TIF_POLLING_NRFLAG	+(1 << TIF_POLLING_NRFLAG)
 
 #define _TIF_WORK_MASK		0x0000FFFE	/* work to do on interrupt/exception return */
diff --git a/arch/openrisc/include/asm/thread_info.h b/arch/openrisc/include/asm/thread_info.h
index 07a8bc080ef2..d797acc901e4 100644
--- a/arch/openrisc/include/asm/thread_info.h
+++ b/arch/openrisc/include/asm/thread_info.h
@@ -121,7 +121,6 @@ register struct thread_info *current_thread_info_reg asm("r10");
 #define _TIF_SIGPENDING		(1<<TIF_SIGPENDING)
 #define _TIF_NEED_RESCHED	(1<<TIF_NEED_RESCHED)
 #define _TIF_SINGLESTEP		(1<<TIF_SINGLESTEP)
-#define _TIF_RESTORE_SIGMASK     (1<<TIF_RESTORE_SIGMASK)
 #define _TIF_POLLING_NRFLAG	(1<<TIF_POLLING_NRFLAG)
 
 
diff --git a/arch/parisc/include/asm/thread_info.h b/arch/parisc/include/asm/thread_info.h
index 22b4726dee49..255630808d63 100644
--- a/arch/parisc/include/asm/thread_info.h
+++ b/arch/parisc/include/asm/thread_info.h
@@ -68,7 +68,6 @@ struct thread_info {
 #define _TIF_NEED_RESCHED	(1 << TIF_NEED_RESCHED)
 #define _TIF_POLLING_NRFLAG	(1 << TIF_POLLING_NRFLAG)
 #define _TIF_32BIT		(1 << TIF_32BIT)
-#define _TIF_RESTORE_SIGMASK	(1 << TIF_RESTORE_SIGMASK)
 #define _TIF_NOTIFY_RESUME	(1 << TIF_NOTIFY_RESUME)
 #define _TIF_SINGLESTEP		(1 << TIF_SINGLESTEP)
 #define _TIF_BLOCKSTEP		(1 << TIF_BLOCKSTEP)
diff --git a/arch/s390/include/asm/thread_info.h b/arch/s390/include/asm/thread_info.h
index bb08e2afc5de..4b4f6ffc8611 100644
--- a/arch/s390/include/asm/thread_info.h
+++ b/arch/s390/include/asm/thread_info.h
@@ -100,7 +100,6 @@ static inline struct thread_info *current_thread_info(void)
 
 #define _TIF_SYSCALL		(1<<TIF_SYSCALL)
 #define _TIF_NOTIFY_RESUME	(1<<TIF_NOTIFY_RESUME)
-#define _TIF_RESTORE_SIGMASK	(1<<TIF_RESTORE_SIGMASK)
 #define _TIF_SIGPENDING		(1<<TIF_SIGPENDING)
 #define _TIF_NEED_RESCHED	(1<<TIF_NEED_RESCHED)
 #define _TIF_PER_TRAP		(1<<TIF_PER_TRAP)
diff --git a/arch/score/include/asm/thread_info.h b/arch/score/include/asm/thread_info.h
index a18006e97f1c..9322a9190286 100644
--- a/arch/score/include/asm/thread_info.h
+++ b/arch/score/include/asm/thread_info.h
@@ -94,7 +94,6 @@ register struct thread_info *__current_thread_info __asm__("r28");
 #define _TIF_SIGPENDING		(1<<TIF_SIGPENDING)
 #define _TIF_NEED_RESCHED	(1<<TIF_NEED_RESCHED)
 #define _TIF_NOTIFY_RESUME	(1<<TIF_NOTIFY_RESUME)
-#define _TIF_RESTORE_SIGMASK	(1<<TIF_RESTORE_SIGMASK)
 #define _TIF_POLLING_NRFLAG	(1<<TIF_POLLING_NRFLAG)
 
 #define _TIF_WORK_MASK		(0x0000ffff)
diff --git a/arch/sparc/include/asm/thread_info_32.h b/arch/sparc/include/asm/thread_info_32.h
index e6cd224506a9..dd3807599bb9 100644
--- a/arch/sparc/include/asm/thread_info_32.h
+++ b/arch/sparc/include/asm/thread_info_32.h
@@ -126,7 +126,6 @@ register struct thread_info *current_thread_info_reg asm("g6");
 #define _TIF_NOTIFY_RESUME	(1<<TIF_NOTIFY_RESUME)
 #define _TIF_SIGPENDING		(1<<TIF_SIGPENDING)
 #define _TIF_NEED_RESCHED	(1<<TIF_NEED_RESCHED)
-#define _TIF_RESTORE_SIGMASK	(1<<TIF_RESTORE_SIGMASK)
 #define _TIF_USEDFPU		(1<<TIF_USEDFPU)
 #define _TIF_POLLING_NRFLAG	(1<<TIF_POLLING_NRFLAG)
 
diff --git a/arch/unicore32/include/asm/thread_info.h b/arch/unicore32/include/asm/thread_info.h
index bf1c3e01197b..818b4a1edb5b 100644
--- a/arch/unicore32/include/asm/thread_info.h
+++ b/arch/unicore32/include/asm/thread_info.h
@@ -141,7 +141,6 @@ static inline struct thread_info *current_thread_info(void)
 #define _TIF_NEED_RESCHED	(1 << TIF_NEED_RESCHED)
 #define _TIF_NOTIFY_RESUME	(1 << TIF_NOTIFY_RESUME)
 #define _TIF_SYSCALL_TRACE	(1 << TIF_SYSCALL_TRACE)
-#define _TIF_RESTORE_SIGMASK	(1 << TIF_RESTORE_SIGMASK)
 
 /*
  * Change these and you break ASM code in entry-common.S
diff --git a/arch/xtensa/include/asm/thread_info.h b/arch/xtensa/include/asm/thread_info.h
index 81abfd5d01ac..a27bc8ce5eff 100644
--- a/arch/xtensa/include/asm/thread_info.h
+++ b/arch/xtensa/include/asm/thread_info.h
@@ -140,7 +140,6 @@ static inline struct thread_info *current_thread_info(void)
 #define _TIF_SINGLESTEP		(1<<TIF_SINGLESTEP)
 #define _TIF_IRET		(1<<TIF_IRET)
 #define _TIF_POLLING_NRFLAG	(1<<TIF_POLLING_NRFLAG)
-#define _TIF_RESTORE_SIGMASK	(1<<TIF_RESTORE_SIGMASK)
 
 #define _TIF_WORK_MASK		0x0000FFFE	/* work to do on interrupt/exception return */
 #define _TIF_ALLWORK_MASK	0x0000FFFF	/* work to do on any return to u-space */
-- 
cgit v1.2.3


From 16a8016372c42c7628eb4a39d75386a461e8c5d0 Mon Sep 17 00:00:00 2001
From: Al Viro <viro@zeniv.linux.org.uk>
Date: Fri, 1 Jun 2012 14:22:01 -0400
Subject: sanitize tsk_is_polling()

Make default just return 0.  The current default (checking
TIF_POLLING_NRFLAG) is taken to architectures that need it;
ones that don't do polling in their idle threads don't need
to defined TIF_POLLING_NRFLAG at all.

ia64 defined both TS_POLLING (used by its tsk_is_polling())
and TIF_POLLING_NRFLAG (not used at all).  Killed the latter...

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
---
 arch/alpha/include/asm/thread_info.h      | 2 ++
 arch/arm/include/asm/thread_info.h        | 2 --
 arch/avr32/include/asm/thread_info.h      | 4 ----
 arch/blackfin/include/asm/thread_info.h   | 3 ---
 arch/c6x/include/asm/thread_info.h        | 1 -
 arch/c6x/kernel/asm-offsets.c             | 1 -
 arch/cris/include/asm/thread_info.h       | 2 --
 arch/frv/include/asm/thread_info.h        | 2 --
 arch/h8300/include/asm/thread_info.h      | 3 ---
 arch/hexagon/include/asm/thread_info.h    | 2 --
 arch/ia64/include/asm/thread_info.h       | 2 --
 arch/m32r/include/asm/thread_info.h       | 2 --
 arch/microblaze/include/asm/thread_info.h | 1 +
 arch/mips/include/asm/thread_info.h       | 2 --
 arch/mn10300/include/asm/thread_info.h    | 2 ++
 arch/openrisc/include/asm/thread_info.h   | 2 ++
 arch/parisc/include/asm/thread_info.h     | 2 ++
 arch/powerpc/include/asm/thread_info.h    | 2 ++
 arch/s390/include/asm/thread_info.h       | 3 ---
 arch/score/include/asm/thread_info.h      | 3 ---
 arch/sh/include/asm/thread_info.h         | 3 +++
 arch/sparc/include/asm/thread_info_32.h   | 2 ++
 arch/sparc/include/asm/thread_info_64.h   | 3 +++
 arch/um/include/asm/thread_info.h         | 3 ---
 arch/xtensa/include/asm/thread_info.h     | 2 --
 kernel/sched/core.c                       | 2 +-
 26 files changed, 20 insertions(+), 38 deletions(-)

diff --git a/arch/alpha/include/asm/thread_info.h b/arch/alpha/include/asm/thread_info.h
index 2601c8e338da..4554ecbff7c6 100644
--- a/arch/alpha/include/asm/thread_info.h
+++ b/arch/alpha/include/asm/thread_info.h
@@ -116,5 +116,7 @@ register struct thread_info *__current_thread_info __asm__("$8");
 		 (int __user *)(value));				\
 	})
 
+#define tsk_is_polling(t) test_tsk_thread_flag(t, TIF_POLLING_NRFLAG)
+
 #endif /* __KERNEL__ */
 #endif /* _ALPHA_THREAD_INFO_H */
diff --git a/arch/arm/include/asm/thread_info.h b/arch/arm/include/asm/thread_info.h
index af7b0bda3355..b2d6b412172d 100644
--- a/arch/arm/include/asm/thread_info.h
+++ b/arch/arm/include/asm/thread_info.h
@@ -148,7 +148,6 @@ extern int vfp_restore_user_hwstate(struct user_vfp __user *,
 #define TIF_NOTIFY_RESUME	2	/* callback before returning to user */
 #define TIF_SYSCALL_TRACE	8
 #define TIF_SYSCALL_AUDIT	9
-#define TIF_POLLING_NRFLAG	16
 #define TIF_USING_IWMMXT	17
 #define TIF_MEMDIE		18	/* is terminating due to OOM killer */
 #define TIF_RESTORE_SIGMASK	20
@@ -160,7 +159,6 @@ extern int vfp_restore_user_hwstate(struct user_vfp __user *,
 #define _TIF_NOTIFY_RESUME	(1 << TIF_NOTIFY_RESUME)
 #define _TIF_SYSCALL_TRACE	(1 << TIF_SYSCALL_TRACE)
 #define _TIF_SYSCALL_AUDIT	(1 << TIF_SYSCALL_AUDIT)
-#define _TIF_POLLING_NRFLAG	(1 << TIF_POLLING_NRFLAG)
 #define _TIF_USING_IWMMXT	(1 << TIF_USING_IWMMXT)
 #define _TIF_SECCOMP		(1 << TIF_SECCOMP)
 
diff --git a/arch/avr32/include/asm/thread_info.h b/arch/avr32/include/asm/thread_info.h
index a32c88cb2601..dc0c45721499 100644
--- a/arch/avr32/include/asm/thread_info.h
+++ b/arch/avr32/include/asm/thread_info.h
@@ -77,8 +77,6 @@ static inline struct thread_info *current_thread_info(void)
 #define TIF_SYSCALL_TRACE       0       /* syscall trace active */
 #define TIF_SIGPENDING          1       /* signal pending */
 #define TIF_NEED_RESCHED        2       /* rescheduling necessary */
-#define TIF_POLLING_NRFLAG      3       /* true if poll_idle() is polling
-					   TIF_NEED_RESCHED */
 #define TIF_BREAKPOINT		4	/* enter monitor mode on return */
 #define TIF_SINGLE_STEP		5	/* single step in progress */
 #define TIF_MEMDIE		6	/* is terminating due to OOM killer */
@@ -91,7 +89,6 @@ static inline struct thread_info *current_thread_info(void)
 #define _TIF_SYSCALL_TRACE	(1 << TIF_SYSCALL_TRACE)
 #define _TIF_SIGPENDING		(1 << TIF_SIGPENDING)
 #define _TIF_NEED_RESCHED	(1 << TIF_NEED_RESCHED)
-#define _TIF_POLLING_NRFLAG	(1 << TIF_POLLING_NRFLAG)
 #define _TIF_SINGLE_STEP	(1 << TIF_SINGLE_STEP)
 #define _TIF_MEMDIE		(1 << TIF_MEMDIE)
 #define _TIF_CPU_GOING_TO_SLEEP (1 << TIF_CPU_GOING_TO_SLEEP)
@@ -104,7 +101,6 @@ static inline struct thread_info *current_thread_info(void)
 	((1 << TIF_SIGPENDING)			\
 	 | _TIF_NOTIFY_RESUME			\
 	 | (1 << TIF_NEED_RESCHED)		\
-	 | (1 << TIF_POLLING_NRFLAG)		\
 	 | (1 << TIF_BREAKPOINT)		\
 	 | (1 << TIF_RESTORE_SIGMASK))
 
diff --git a/arch/blackfin/include/asm/thread_info.h b/arch/blackfin/include/asm/thread_info.h
index f9a8731b7e81..3894005337ba 100644
--- a/arch/blackfin/include/asm/thread_info.h
+++ b/arch/blackfin/include/asm/thread_info.h
@@ -96,8 +96,6 @@ static inline struct thread_info *current_thread_info(void)
 #define TIF_SYSCALL_TRACE	0	/* syscall trace active */
 #define TIF_SIGPENDING		1	/* signal pending */
 #define TIF_NEED_RESCHED	2	/* rescheduling necessary */
-#define TIF_POLLING_NRFLAG	3	/* true if poll_idle() is polling
-					   TIF_NEED_RESCHED */
 #define TIF_MEMDIE		4	/* is terminating due to OOM killer */
 #define TIF_RESTORE_SIGMASK	5	/* restore signal mask in do_signal() */
 #define TIF_IRQ_SYNC		7	/* sync pipeline stage */
@@ -108,7 +106,6 @@ static inline struct thread_info *current_thread_info(void)
 #define _TIF_SYSCALL_TRACE	(1<<TIF_SYSCALL_TRACE)
 #define _TIF_SIGPENDING		(1<<TIF_SIGPENDING)
 #define _TIF_NEED_RESCHED	(1<<TIF_NEED_RESCHED)
-#define _TIF_POLLING_NRFLAG	(1<<TIF_POLLING_NRFLAG)
 #define _TIF_IRQ_SYNC		(1<<TIF_IRQ_SYNC)
 #define _TIF_NOTIFY_RESUME	(1<<TIF_NOTIFY_RESUME)
 #define _TIF_SINGLESTEP		(1<<TIF_SINGLESTEP)
diff --git a/arch/c6x/include/asm/thread_info.h b/arch/c6x/include/asm/thread_info.h
index 1710bcbb8d09..4c8dc562bd90 100644
--- a/arch/c6x/include/asm/thread_info.h
+++ b/arch/c6x/include/asm/thread_info.h
@@ -97,7 +97,6 @@ struct thread_info *current_thread_info(void)
 #define TIF_NEED_RESCHED	3	/* rescheduling necessary */
 #define TIF_RESTORE_SIGMASK	4	/* restore signal mask in do_signal() */
 
-#define TIF_POLLING_NRFLAG	16	/* true if polling TIF_NEED_RESCHED */
 #define TIF_MEMDIE		17	/* OOM killer killed process */
 
 #define TIF_WORK_MASK		0x00007FFE /* work on irq/exception return */
diff --git a/arch/c6x/kernel/asm-offsets.c b/arch/c6x/kernel/asm-offsets.c
index 759ad6d207b6..60f1e437745d 100644
--- a/arch/c6x/kernel/asm-offsets.c
+++ b/arch/c6x/kernel/asm-offsets.c
@@ -116,7 +116,6 @@ void foo(void)
 	DEFINE(_TIF_NOTIFY_RESUME, (1<<TIF_NOTIFY_RESUME));
 	DEFINE(_TIF_SIGPENDING, (1<<TIF_SIGPENDING));
 	DEFINE(_TIF_NEED_RESCHED, (1<<TIF_NEED_RESCHED));
-	DEFINE(_TIF_POLLING_NRFLAG, (1<<TIF_POLLING_NRFLAG));
 
 	DEFINE(_TIF_ALLWORK_MASK, TIF_ALLWORK_MASK);
 	DEFINE(_TIF_WORK_MASK, TIF_WORK_MASK);
diff --git a/arch/cris/include/asm/thread_info.h b/arch/cris/include/asm/thread_info.h
index 0e0b52d3e22a..07c8c40c52b3 100644
--- a/arch/cris/include/asm/thread_info.h
+++ b/arch/cris/include/asm/thread_info.h
@@ -78,14 +78,12 @@ struct thread_info {
 #define TIF_SIGPENDING		2	/* signal pending */
 #define TIF_NEED_RESCHED	3	/* rescheduling necessary */
 #define TIF_RESTORE_SIGMASK	9	/* restore signal mask in do_signal() */
-#define TIF_POLLING_NRFLAG	16	/* true if poll_idle() is polling TIF_NEED_RESCHED */
 #define TIF_MEMDIE		17	/* is terminating due to OOM killer */
 
 #define _TIF_SYSCALL_TRACE	(1<<TIF_SYSCALL_TRACE)
 #define _TIF_NOTIFY_RESUME	(1<<TIF_NOTIFY_RESUME)
 #define _TIF_SIGPENDING		(1<<TIF_SIGPENDING)
 #define _TIF_NEED_RESCHED	(1<<TIF_NEED_RESCHED)
-#define _TIF_POLLING_NRFLAG	(1<<TIF_POLLING_NRFLAG)
 
 #define _TIF_WORK_MASK		0x0000FFFE	/* work to do on interrupt/exception return */
 #define _TIF_ALLWORK_MASK	0x0000FFFF	/* work to do on any return to u-space */
diff --git a/arch/frv/include/asm/thread_info.h b/arch/frv/include/asm/thread_info.h
index 5108ede011a5..bebd7eadc772 100644
--- a/arch/frv/include/asm/thread_info.h
+++ b/arch/frv/include/asm/thread_info.h
@@ -94,7 +94,6 @@ register struct thread_info *__current_thread_info asm("gr15");
 #define TIF_NEED_RESCHED	3	/* rescheduling necessary */
 #define TIF_SINGLESTEP		4	/* restore singlestep on return to user mode */
 #define TIF_RESTORE_SIGMASK	5	/* restore signal mask in do_signal() */
-#define TIF_POLLING_NRFLAG	6	/* true if poll_idle() is polling TIF_NEED_RESCHED */
 #define TIF_MEMDIE		7	/* is terminating due to OOM killer */
 
 #define _TIF_SYSCALL_TRACE	(1 << TIF_SYSCALL_TRACE)
@@ -102,7 +101,6 @@ register struct thread_info *__current_thread_info asm("gr15");
 #define _TIF_SIGPENDING		(1 << TIF_SIGPENDING)
 #define _TIF_NEED_RESCHED	(1 << TIF_NEED_RESCHED)
 #define _TIF_SINGLESTEP		(1 << TIF_SINGLESTEP)
-#define _TIF_POLLING_NRFLAG	(1 << TIF_POLLING_NRFLAG)
 
 /* work to do on interrupt/exception return */
 #define _TIF_WORK_MASK		\
diff --git a/arch/h8300/include/asm/thread_info.h b/arch/h8300/include/asm/thread_info.h
index aa0406bf0206..63cc298edb67 100644
--- a/arch/h8300/include/asm/thread_info.h
+++ b/arch/h8300/include/asm/thread_info.h
@@ -85,8 +85,6 @@ static inline struct thread_info *current_thread_info(void)
 #define TIF_SYSCALL_TRACE	0	/* syscall trace active */
 #define TIF_SIGPENDING		1	/* signal pending */
 #define TIF_NEED_RESCHED	2	/* rescheduling necessary */
-#define TIF_POLLING_NRFLAG	3	/* true if poll_idle() is polling
-					   TIF_NEED_RESCHED */
 #define TIF_MEMDIE		4	/* is terminating due to OOM killer */
 #define TIF_RESTORE_SIGMASK	5	/* restore signal mask in do_signal() */
 #define TIF_NOTIFY_RESUME	6	/* callback before returning to user */
@@ -95,7 +93,6 @@ static inline struct thread_info *current_thread_info(void)
 #define _TIF_SYSCALL_TRACE	(1<<TIF_SYSCALL_TRACE)
 #define _TIF_SIGPENDING		(1<<TIF_SIGPENDING)
 #define _TIF_NEED_RESCHED	(1<<TIF_NEED_RESCHED)
-#define _TIF_POLLING_NRFLAG	(1<<TIF_POLLING_NRFLAG)
 #define _TIF_NOTIFY_RESUME	(1 << TIF_NOTIFY_RESUME)
 
 #define _TIF_WORK_MASK		0x0000FFFE	/* work to do on interrupt/exception return */
diff --git a/arch/hexagon/include/asm/thread_info.h b/arch/hexagon/include/asm/thread_info.h
index b5a6d43411c0..7f33f1677119 100644
--- a/arch/hexagon/include/asm/thread_info.h
+++ b/arch/hexagon/include/asm/thread_info.h
@@ -123,7 +123,6 @@ register struct thread_info *__current_thread_info asm(QUOTED_THREADINFO_REG);
 #define TIF_IRET                5       /* return with iret */
 #define TIF_RESTORE_SIGMASK     6       /* restore sig mask in do_signal() */
 /* true if poll_idle() is polling TIF_NEED_RESCHED */
-#define TIF_POLLING_NRFLAG      16
 #define TIF_MEMDIE              17      /* OOM killer killed process */
 
 #define _TIF_SYSCALL_TRACE      (1 << TIF_SYSCALL_TRACE)
@@ -132,7 +131,6 @@ register struct thread_info *__current_thread_info asm(QUOTED_THREADINFO_REG);
 #define _TIF_NEED_RESCHED       (1 << TIF_NEED_RESCHED)
 #define _TIF_SINGLESTEP         (1 << TIF_SINGLESTEP)
 #define _TIF_IRET               (1 << TIF_IRET)
-#define _TIF_POLLING_NRFLAG     (1 << TIF_POLLING_NRFLAG)
 
 /* work to do on interrupt/exception return - All but TIF_SYSCALL_TRACE */
 #define _TIF_WORK_MASK          (0x0000FFFF & ~_TIF_SYSCALL_TRACE)
diff --git a/arch/ia64/include/asm/thread_info.h b/arch/ia64/include/asm/thread_info.h
index f7ee85378311..ff2ae4136584 100644
--- a/arch/ia64/include/asm/thread_info.h
+++ b/arch/ia64/include/asm/thread_info.h
@@ -106,7 +106,6 @@ struct thread_info {
 #define TIF_SYSCALL_AUDIT	3	/* syscall auditing active */
 #define TIF_SINGLESTEP		4	/* restore singlestep on return to user mode */
 #define TIF_NOTIFY_RESUME	6	/* resumption notification requested */
-#define TIF_POLLING_NRFLAG	16	/* true if poll_idle() is polling TIF_NEED_RESCHED */
 #define TIF_MEMDIE		17	/* is terminating due to OOM killer */
 #define TIF_MCA_INIT		18	/* this task is processing MCA or INIT */
 #define TIF_DB_DISABLED		19	/* debug trap disabled for fsyscall */
@@ -119,7 +118,6 @@ struct thread_info {
 #define _TIF_NOTIFY_RESUME	(1 << TIF_NOTIFY_RESUME)
 #define _TIF_SIGPENDING		(1 << TIF_SIGPENDING)
 #define _TIF_NEED_RESCHED	(1 << TIF_NEED_RESCHED)
-#define _TIF_POLLING_NRFLAG	(1 << TIF_POLLING_NRFLAG)
 #define _TIF_MCA_INIT		(1 << TIF_MCA_INIT)
 #define _TIF_DB_DISABLED	(1 << TIF_DB_DISABLED)
 #define _TIF_RESTORE_RSE	(1 << TIF_RESTORE_RSE)
diff --git a/arch/m32r/include/asm/thread_info.h b/arch/m32r/include/asm/thread_info.h
index 18b058457d31..763e8aec5ea5 100644
--- a/arch/m32r/include/asm/thread_info.h
+++ b/arch/m32r/include/asm/thread_info.h
@@ -123,7 +123,6 @@ static inline unsigned int get_thread_fault_code(void)
 #define TIF_NOTIFY_RESUME	5	/* callback before returning to user */
 #define TIF_RESTORE_SIGMASK	8	/* restore signal mask in do_signal() */
 #define TIF_USEDFPU		16	/* FPU was used by this task this quantum (SMP) */
-#define TIF_POLLING_NRFLAG	17	/* true if poll_idle() is polling TIF_NEED_RESCHED */
 #define TIF_MEMDIE		18	/* is terminating due to OOM killer */
 
 #define _TIF_SYSCALL_TRACE	(1<<TIF_SYSCALL_TRACE)
@@ -133,7 +132,6 @@ static inline unsigned int get_thread_fault_code(void)
 #define _TIF_IRET		(1<<TIF_IRET)
 #define _TIF_NOTIFY_RESUME	(1<<TIF_NOTIFY_RESUME)
 #define _TIF_USEDFPU		(1<<TIF_USEDFPU)
-#define _TIF_POLLING_NRFLAG	(1<<TIF_POLLING_NRFLAG)
 
 #define _TIF_WORK_MASK		0x0000FFFE	/* work to do on interrupt/exception return */
 #define _TIF_ALLWORK_MASK	0x0000FFFF	/* work to do on any return to u-space */
diff --git a/arch/microblaze/include/asm/thread_info.h b/arch/microblaze/include/asm/thread_info.h
index 6c610234ffab..a2565347a39d 100644
--- a/arch/microblaze/include/asm/thread_info.h
+++ b/arch/microblaze/include/asm/thread_info.h
@@ -184,6 +184,7 @@ static inline bool test_and_clear_restore_sigmask(void)
 	ti->status &= ~TS_RESTORE_SIGMASK;
 	return true;
 }
+#define tsk_is_polling(t) test_tsk_thread_flag(t, TIF_POLLING_NRFLAG)
 #endif
 
 #endif /* __KERNEL__ */
diff --git a/arch/mips/include/asm/thread_info.h b/arch/mips/include/asm/thread_info.h
index a75a11abf7b0..8debe9e91754 100644
--- a/arch/mips/include/asm/thread_info.h
+++ b/arch/mips/include/asm/thread_info.h
@@ -103,7 +103,6 @@ register struct thread_info *__current_thread_info __asm__("$28");
 #define TIF_NOTIFY_RESUME	5	/* callback before returning to user */
 #define TIF_RESTORE_SIGMASK	9	/* restore signal mask in do_signal() */
 #define TIF_USEDFPU		16	/* FPU was used by this task this quantum (SMP) */
-#define TIF_POLLING_NRFLAG	17	/* true if poll_idle() is polling TIF_NEED_RESCHED */
 #define TIF_MEMDIE		18	/* is terminating due to OOM killer */
 #define TIF_FIXADE		20	/* Fix address errors in software */
 #define TIF_LOGADE		21	/* Log address errors to syslog */
@@ -126,7 +125,6 @@ register struct thread_info *__current_thread_info __asm__("$28");
 #define _TIF_SECCOMP		(1<<TIF_SECCOMP)
 #define _TIF_NOTIFY_RESUME	(1<<TIF_NOTIFY_RESUME)
 #define _TIF_USEDFPU		(1<<TIF_USEDFPU)
-#define _TIF_POLLING_NRFLAG	(1<<TIF_POLLING_NRFLAG)
 #define _TIF_FIXADE		(1<<TIF_FIXADE)
 #define _TIF_LOGADE		(1<<TIF_LOGADE)
 #define _TIF_32BIT_REGS		(1<<TIF_32BIT_REGS)
diff --git a/arch/mn10300/include/asm/thread_info.h b/arch/mn10300/include/asm/thread_info.h
index 224b4262486d..f90062b0622d 100644
--- a/arch/mn10300/include/asm/thread_info.h
+++ b/arch/mn10300/include/asm/thread_info.h
@@ -165,6 +165,8 @@ void arch_release_thread_info(struct thread_info *ti);
 #define _TIF_WORK_MASK		0x0000FFFE	/* work to do on interrupt/exception return */
 #define _TIF_ALLWORK_MASK	0x0000FFFF	/* work to do on any return to u-space */
 
+#define tsk_is_polling(t) test_tsk_thread_flag(t, TIF_POLLING_NRFLAG)
+
 #endif /* __KERNEL__ */
 
 #endif /* _ASM_THREAD_INFO_H */
diff --git a/arch/openrisc/include/asm/thread_info.h b/arch/openrisc/include/asm/thread_info.h
index d797acc901e4..07f3212422ad 100644
--- a/arch/openrisc/include/asm/thread_info.h
+++ b/arch/openrisc/include/asm/thread_info.h
@@ -128,6 +128,8 @@ register struct thread_info *current_thread_info_reg asm("r10");
 /* For OpenRISC, this is anything in the LSW other than syscall trace */
 #define _TIF_WORK_MASK (0xff & ~(_TIF_SYSCALL_TRACE|_TIF_SINGLESTEP))
 
+#define tsk_is_polling(t) test_tsk_thread_flag(t, TIF_POLLING_NRFLAG)
+
 #endif /* __KERNEL__ */
 
 #endif /* _ASM_THREAD_INFO_H */
diff --git a/arch/parisc/include/asm/thread_info.h b/arch/parisc/include/asm/thread_info.h
index 255630808d63..d0e2fe7d54a6 100644
--- a/arch/parisc/include/asm/thread_info.h
+++ b/arch/parisc/include/asm/thread_info.h
@@ -75,6 +75,8 @@ struct thread_info {
 #define _TIF_USER_WORK_MASK     (_TIF_SIGPENDING | _TIF_NOTIFY_RESUME | \
                                  _TIF_NEED_RESCHED)
 
+#define tsk_is_polling(t) test_tsk_thread_flag(t, TIF_POLLING_NRFLAG)
+
 #endif /* __KERNEL__ */
 
 #endif /* _ASM_PARISC_THREAD_INFO_H */
diff --git a/arch/powerpc/include/asm/thread_info.h b/arch/powerpc/include/asm/thread_info.h
index faf93529cbf0..5b1974f651c0 100644
--- a/arch/powerpc/include/asm/thread_info.h
+++ b/arch/powerpc/include/asm/thread_info.h
@@ -177,6 +177,8 @@ static inline bool test_thread_local_flags(unsigned int flags)
 #define is_32bit_task()	(1)
 #endif
 
+#define tsk_is_polling(t) test_tsk_thread_flag(t, TIF_POLLING_NRFLAG)
+
 #endif	/* !__ASSEMBLY__ */
 
 #endif /* __KERNEL__ */
diff --git a/arch/s390/include/asm/thread_info.h b/arch/s390/include/asm/thread_info.h
index 4b4f6ffc8611..9e2cfe0349c3 100644
--- a/arch/s390/include/asm/thread_info.h
+++ b/arch/s390/include/asm/thread_info.h
@@ -91,8 +91,6 @@ static inline struct thread_info *current_thread_info(void)
 #define TIF_SYSCALL_AUDIT	9	/* syscall auditing active */
 #define TIF_SECCOMP		10	/* secure computing */
 #define TIF_SYSCALL_TRACEPOINT	11	/* syscall tracepoint instrumentation */
-#define TIF_POLLING_NRFLAG	16	/* true if poll_idle() is polling
-					   TIF_NEED_RESCHED */
 #define TIF_31BIT		17	/* 32bit process */
 #define TIF_MEMDIE		18	/* is terminating due to OOM killer */
 #define TIF_RESTORE_SIGMASK	19	/* restore signal mask in do_signal() */
@@ -108,7 +106,6 @@ static inline struct thread_info *current_thread_info(void)
 #define _TIF_SYSCALL_AUDIT	(1<<TIF_SYSCALL_AUDIT)
 #define _TIF_SECCOMP		(1<<TIF_SECCOMP)
 #define _TIF_SYSCALL_TRACEPOINT	(1<<TIF_SYSCALL_TRACEPOINT)
-#define _TIF_POLLING_NRFLAG	(1<<TIF_POLLING_NRFLAG)
 #define _TIF_31BIT		(1<<TIF_31BIT)
 #define _TIF_SINGLE_STEP	(1<<TIF_SINGLE_STEP)
 
diff --git a/arch/score/include/asm/thread_info.h b/arch/score/include/asm/thread_info.h
index 9322a9190286..1425cc034872 100644
--- a/arch/score/include/asm/thread_info.h
+++ b/arch/score/include/asm/thread_info.h
@@ -86,15 +86,12 @@ register struct thread_info *__current_thread_info __asm__("r28");
 #define TIF_NEED_RESCHED	2	/* rescheduling necessary */
 #define TIF_NOTIFY_RESUME	5	/* callback before returning to user */
 #define TIF_RESTORE_SIGMASK	9	/* restore signal mask in do_signal() */
-#define TIF_POLLING_NRFLAG	17	/* true if poll_idle() is polling
-						 TIF_NEED_RESCHED */
 #define TIF_MEMDIE		18	/* is terminating due to OOM killer */
 
 #define _TIF_SYSCALL_TRACE	(1<<TIF_SYSCALL_TRACE)
 #define _TIF_SIGPENDING		(1<<TIF_SIGPENDING)
 #define _TIF_NEED_RESCHED	(1<<TIF_NEED_RESCHED)
 #define _TIF_NOTIFY_RESUME	(1<<TIF_NOTIFY_RESUME)
-#define _TIF_POLLING_NRFLAG	(1<<TIF_POLLING_NRFLAG)
 
 #define _TIF_WORK_MASK		(0x0000ffff)
 
diff --git a/arch/sh/include/asm/thread_info.h b/arch/sh/include/asm/thread_info.h
index bc13b57cdc83..7d5ac4e48485 100644
--- a/arch/sh/include/asm/thread_info.h
+++ b/arch/sh/include/asm/thread_info.h
@@ -206,6 +206,9 @@ static inline bool test_and_clear_restore_sigmask(void)
 	ti->status &= ~TS_RESTORE_SIGMASK;
 	return true;
 }
+
+#define tsk_is_polling(t) test_tsk_thread_flag(t, TIF_POLLING_NRFLAG)
+
 #endif	/* !__ASSEMBLY__ */
 
 #endif /* __KERNEL__ */
diff --git a/arch/sparc/include/asm/thread_info_32.h b/arch/sparc/include/asm/thread_info_32.h
index dd3807599bb9..25849ae3e900 100644
--- a/arch/sparc/include/asm/thread_info_32.h
+++ b/arch/sparc/include/asm/thread_info_32.h
@@ -132,6 +132,8 @@ register struct thread_info *current_thread_info_reg asm("g6");
 #define _TIF_DO_NOTIFY_RESUME_MASK	(_TIF_NOTIFY_RESUME | \
 					 _TIF_SIGPENDING)
 
+#define tsk_is_polling(t) test_tsk_thread_flag(t, TIF_POLLING_NRFLAG)
+
 #endif /* __KERNEL__ */
 
 #endif /* _ASM_THREAD_INFO_H */
diff --git a/arch/sparc/include/asm/thread_info_64.h b/arch/sparc/include/asm/thread_info_64.h
index cfa8c38fb9c8..4e2276631081 100644
--- a/arch/sparc/include/asm/thread_info_64.h
+++ b/arch/sparc/include/asm/thread_info_64.h
@@ -256,6 +256,9 @@ static inline bool test_and_clear_restore_sigmask(void)
 	ti->status &= ~TS_RESTORE_SIGMASK;
 	return true;
 }
+
+#define tsk_is_polling(t) test_tsk_thread_flag(t, TIF_POLLING_NRFLAG)
+
 #endif	/* !__ASSEMBLY__ */
 
 #endif /* __KERNEL__ */
diff --git a/arch/um/include/asm/thread_info.h b/arch/um/include/asm/thread_info.h
index c04e5ab68f56..2c8eeb2df8b4 100644
--- a/arch/um/include/asm/thread_info.h
+++ b/arch/um/include/asm/thread_info.h
@@ -65,8 +65,6 @@ static inline struct thread_info *current_thread_info(void)
 #define TIF_SYSCALL_TRACE	0	/* syscall trace active */
 #define TIF_SIGPENDING		1	/* signal pending */
 #define TIF_NEED_RESCHED	2	/* rescheduling necessary */
-#define TIF_POLLING_NRFLAG      3       /* true if poll_idle() is polling
-					 * TIF_NEED_RESCHED */
 #define TIF_RESTART_BLOCK	4
 #define TIF_MEMDIE		5	/* is terminating due to OOM killer */
 #define TIF_SYSCALL_AUDIT	6
@@ -76,7 +74,6 @@ static inline struct thread_info *current_thread_info(void)
 #define _TIF_SYSCALL_TRACE	(1 << TIF_SYSCALL_TRACE)
 #define _TIF_SIGPENDING		(1 << TIF_SIGPENDING)
 #define _TIF_NEED_RESCHED	(1 << TIF_NEED_RESCHED)
-#define _TIF_POLLING_NRFLAG     (1 << TIF_POLLING_NRFLAG)
 #define _TIF_MEMDIE		(1 << TIF_MEMDIE)
 #define _TIF_SYSCALL_AUDIT	(1 << TIF_SYSCALL_AUDIT)
 
diff --git a/arch/xtensa/include/asm/thread_info.h b/arch/xtensa/include/asm/thread_info.h
index a27bc8ce5eff..214be732b2b2 100644
--- a/arch/xtensa/include/asm/thread_info.h
+++ b/arch/xtensa/include/asm/thread_info.h
@@ -132,14 +132,12 @@ static inline struct thread_info *current_thread_info(void)
 #define TIF_MEMDIE		5	/* is terminating due to OOM killer */
 #define TIF_RESTORE_SIGMASK	6	/* restore signal mask in do_signal() */
 #define TIF_NOTIFY_RESUME	7	/* callback before returning to user */
-#define TIF_POLLING_NRFLAG	16	/* true if poll_idle() is polling TIF_NEED_RESCHED */
 
 #define _TIF_SYSCALL_TRACE	(1<<TIF_SYSCALL_TRACE)
 #define _TIF_SIGPENDING		(1<<TIF_SIGPENDING)
 #define _TIF_NEED_RESCHED	(1<<TIF_NEED_RESCHED)
 #define _TIF_SINGLESTEP		(1<<TIF_SINGLESTEP)
 #define _TIF_IRET		(1<<TIF_IRET)
-#define _TIF_POLLING_NRFLAG	(1<<TIF_POLLING_NRFLAG)
 
 #define _TIF_WORK_MASK		0x0000FFFE	/* work to do on interrupt/exception return */
 #define _TIF_ALLWORK_MASK	0x0000FFFF	/* work to do on any return to u-space */
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 649c9f876cb1..9dcf93c24d10 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -505,7 +505,7 @@ static inline void init_hrtick(void)
 #ifdef CONFIG_SMP
 
 #ifndef tsk_is_polling
-#define tsk_is_polling(t) test_tsk_thread_flag(t, TIF_POLLING_NRFLAG)
+#define tsk_is_polling(t) 0
 #endif
 
 void resched_task(struct task_struct *p)
-- 
cgit v1.2.3


From 8ca8230b71322bfe45fc78090019a5bb20cd7439 Mon Sep 17 00:00:00 2001
From: Al Viro <viro@zeniv.linux.org.uk>
Date: Mon, 7 May 2012 17:37:26 -0400
Subject: bury the rest of TIF_IRET

Some architectures had blindly copied it for no reason whatsoever.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
---
 arch/hexagon/include/asm/thread_info.h    | 2 --
 arch/m32r/include/asm/thread_info.h       | 2 --
 arch/m32r/kernel/signal.c                 | 2 --
 arch/microblaze/include/asm/thread_info.h | 2 --
 arch/xtensa/include/asm/thread_info.h     | 2 --
 5 files changed, 10 deletions(-)

diff --git a/arch/hexagon/include/asm/thread_info.h b/arch/hexagon/include/asm/thread_info.h
index 7f33f1677119..e4a0aad69cbb 100644
--- a/arch/hexagon/include/asm/thread_info.h
+++ b/arch/hexagon/include/asm/thread_info.h
@@ -120,7 +120,6 @@ register struct thread_info *__current_thread_info asm(QUOTED_THREADINFO_REG);
 #define TIF_SIGPENDING          2       /* signal pending */
 #define TIF_NEED_RESCHED        3       /* rescheduling necessary */
 #define TIF_SINGLESTEP          4       /* restore ss @ return to usr mode */
-#define TIF_IRET                5       /* return with iret */
 #define TIF_RESTORE_SIGMASK     6       /* restore sig mask in do_signal() */
 /* true if poll_idle() is polling TIF_NEED_RESCHED */
 #define TIF_MEMDIE              17      /* OOM killer killed process */
@@ -130,7 +129,6 @@ register struct thread_info *__current_thread_info asm(QUOTED_THREADINFO_REG);
 #define _TIF_SIGPENDING         (1 << TIF_SIGPENDING)
 #define _TIF_NEED_RESCHED       (1 << TIF_NEED_RESCHED)
 #define _TIF_SINGLESTEP         (1 << TIF_SINGLESTEP)
-#define _TIF_IRET               (1 << TIF_IRET)
 
 /* work to do on interrupt/exception return - All but TIF_SYSCALL_TRACE */
 #define _TIF_WORK_MASK          (0x0000FFFF & ~_TIF_SYSCALL_TRACE)
diff --git a/arch/m32r/include/asm/thread_info.h b/arch/m32r/include/asm/thread_info.h
index 763e8aec5ea5..aad1c3a913d9 100644
--- a/arch/m32r/include/asm/thread_info.h
+++ b/arch/m32r/include/asm/thread_info.h
@@ -119,7 +119,6 @@ static inline unsigned int get_thread_fault_code(void)
 #define TIF_SIGPENDING		1	/* signal pending */
 #define TIF_NEED_RESCHED	2	/* rescheduling necessary */
 #define TIF_SINGLESTEP		3	/* restore singlestep on return to user mode */
-#define TIF_IRET		4	/* return with iret */
 #define TIF_NOTIFY_RESUME	5	/* callback before returning to user */
 #define TIF_RESTORE_SIGMASK	8	/* restore signal mask in do_signal() */
 #define TIF_USEDFPU		16	/* FPU was used by this task this quantum (SMP) */
@@ -129,7 +128,6 @@ static inline unsigned int get_thread_fault_code(void)
 #define _TIF_SIGPENDING		(1<<TIF_SIGPENDING)
 #define _TIF_NEED_RESCHED	(1<<TIF_NEED_RESCHED)
 #define _TIF_SINGLESTEP		(1<<TIF_SINGLESTEP)
-#define _TIF_IRET		(1<<TIF_IRET)
 #define _TIF_NOTIFY_RESUME	(1<<TIF_NOTIFY_RESUME)
 #define _TIF_USEDFPU		(1<<TIF_USEDFPU)
 
diff --git a/arch/m32r/kernel/signal.c b/arch/m32r/kernel/signal.c
index d0f60b97bbc5..c5101911b49a 100644
--- a/arch/m32r/kernel/signal.c
+++ b/arch/m32r/kernel/signal.c
@@ -366,6 +366,4 @@ void do_notify_resume(struct pt_regs *regs, __u32 thread_info_flags)
 		clear_thread_flag(TIF_NOTIFY_RESUME);
 		tracehook_notify_resume(regs);
 	}
-
-	clear_thread_flag(TIF_IRET);
 }
diff --git a/arch/microblaze/include/asm/thread_info.h b/arch/microblaze/include/asm/thread_info.h
index a2565347a39d..008f30433d22 100644
--- a/arch/microblaze/include/asm/thread_info.h
+++ b/arch/microblaze/include/asm/thread_info.h
@@ -121,7 +121,6 @@ static inline struct thread_info *current_thread_info(void)
 #define TIF_NEED_RESCHED	3 /* rescheduling necessary */
 /* restore singlestep on return to user mode */
 #define TIF_SINGLESTEP		4
-#define TIF_IRET		5 /* return with iret */
 #define TIF_MEMDIE		6	/* is terminating due to OOM killer */
 #define TIF_SYSCALL_AUDIT	9       /* syscall auditing active */
 #define TIF_SECCOMP		10      /* secure computing */
@@ -134,7 +133,6 @@ static inline struct thread_info *current_thread_info(void)
 #define _TIF_SIGPENDING		(1 << TIF_SIGPENDING)
 #define _TIF_NEED_RESCHED	(1 << TIF_NEED_RESCHED)
 #define _TIF_SINGLESTEP		(1 << TIF_SINGLESTEP)
-#define _TIF_IRET		(1 << TIF_IRET)
 #define _TIF_POLLING_NRFLAG	(1 << TIF_POLLING_NRFLAG)
 #define _TIF_SYSCALL_AUDIT	(1 << TIF_SYSCALL_AUDIT)
 #define _TIF_SECCOMP		(1 << TIF_SECCOMP)
diff --git a/arch/xtensa/include/asm/thread_info.h b/arch/xtensa/include/asm/thread_info.h
index 214be732b2b2..9481004ac119 100644
--- a/arch/xtensa/include/asm/thread_info.h
+++ b/arch/xtensa/include/asm/thread_info.h
@@ -128,7 +128,6 @@ static inline struct thread_info *current_thread_info(void)
 #define TIF_SIGPENDING		1	/* signal pending */
 #define TIF_NEED_RESCHED	2	/* rescheduling necessary */
 #define TIF_SINGLESTEP		3	/* restore singlestep on return to user mode */
-#define TIF_IRET		4	/* return with iret */
 #define TIF_MEMDIE		5	/* is terminating due to OOM killer */
 #define TIF_RESTORE_SIGMASK	6	/* restore signal mask in do_signal() */
 #define TIF_NOTIFY_RESUME	7	/* callback before returning to user */
@@ -137,7 +136,6 @@ static inline struct thread_info *current_thread_info(void)
 #define _TIF_SIGPENDING		(1<<TIF_SIGPENDING)
 #define _TIF_NEED_RESCHED	(1<<TIF_NEED_RESCHED)
 #define _TIF_SINGLESTEP		(1<<TIF_SINGLESTEP)
-#define _TIF_IRET		(1<<TIF_IRET)
 
 #define _TIF_WORK_MASK		0x0000FFFE	/* work to do on interrupt/exception return */
 #define _TIF_ALLWORK_MASK	0x0000FFFF	/* work to do on any return to u-space */
-- 
cgit v1.2.3


From 00df111e7eb505558c54f23861e9341e56dd5fb0 Mon Sep 17 00:00:00 2001
From: Al Viro <viro@zeniv.linux.org.uk>
Date: Sat, 19 May 2012 00:29:22 -0400
Subject: parisc: fix double restarts

Don't bother restoring r28 on syscall restarts; it's clobbered by
syscall anyway.  Reuse (now unused) ->orig_r28 as "no restarts allowed"
flag.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
---
 arch/parisc/hpux/gate.S      |  2 +-
 arch/parisc/kernel/signal.c  | 16 ++++++++--------
 arch/parisc/kernel/syscall.S |  2 +-
 3 files changed, 10 insertions(+), 10 deletions(-)

diff --git a/arch/parisc/hpux/gate.S b/arch/parisc/hpux/gate.S
index 38a1c1b8d4e8..011468857e98 100644
--- a/arch/parisc/hpux/gate.S
+++ b/arch/parisc/hpux/gate.S
@@ -71,7 +71,7 @@ ENTRY(hpux_gateway_page)
 	STREG	%r26, TASK_PT_GR26(%r1)	 	/* 1st argument */
 	STREG	%r27, TASK_PT_GR27(%r1)		/* user dp */
 	STREG   %r28, TASK_PT_GR28(%r1)         /* return value 0 */
-	STREG   %r28, TASK_PT_ORIG_R28(%r1)     /* return value 0 (saved for signals) */
+	STREG   %r0, TASK_PT_ORIG_R28(%r1)     /* don't prohibit restarts */
 	STREG   %r29, TASK_PT_GR29(%r1)         /* 8th argument */
 	STREG	%r31, TASK_PT_GR31(%r1)		/* preserve syscall return ptr */
 	
diff --git a/arch/parisc/kernel/signal.c b/arch/parisc/kernel/signal.c
index 594459bde14e..3790a3237172 100644
--- a/arch/parisc/kernel/signal.c
+++ b/arch/parisc/kernel/signal.c
@@ -113,6 +113,8 @@ sys_rt_sigreturn(struct pt_regs *regs, int in_syscall)
 		(usp - sigframe_size);
 	DBG(2,"sys_rt_sigreturn: frame is %p\n", frame);
 
+	regs->orig_r28 = 1; /* no restarts for sigreturn */
+
 #ifdef CONFIG_64BIT
 	compat_frame = (struct compat_rt_sigframe __user *)frame;
 	
@@ -462,6 +464,9 @@ handle_signal(unsigned long sig, siginfo_t *info, struct k_sigaction *ka,
 static inline void
 syscall_restart(struct pt_regs *regs, struct k_sigaction *ka)
 {
+	if (regs->orig_r28)
+		return;
+	regs->orig_r28 = 1; /* no more restarts */
 	/* Check the return code */
 	switch (regs->gr[28]) {
 	case -ERESTART_RESTARTBLOCK:
@@ -482,8 +487,6 @@ syscall_restart(struct pt_regs *regs, struct k_sigaction *ka)
 		 * we have to do is fiddle the return pointer.
 		 */
 		regs->gr[31] -= 8; /* delayed branching */
-		/* Preserve original r28. */
-		regs->gr[28] = regs->orig_r28;
 		break;
 	}
 }
@@ -491,6 +494,9 @@ syscall_restart(struct pt_regs *regs, struct k_sigaction *ka)
 static inline void
 insert_restart_trampoline(struct pt_regs *regs)
 {
+	if (regs->orig_r28)
+		return;
+	regs->orig_r28 = 1; /* no more restarts */
 	switch(regs->gr[28]) {
 	case -ERESTART_RESTARTBLOCK: {
 		/* Restart the system call - no handlers present */
@@ -525,9 +531,6 @@ insert_restart_trampoline(struct pt_regs *regs)
 		flush_user_icache_range(regs->gr[30], regs->gr[30] + 4);
 
 		regs->gr[31] = regs->gr[30] + 8;
-		/* Preserve original r28. */
-		regs->gr[28] = regs->orig_r28;
-
 		return;
 	}
 	case -ERESTARTNOHAND:
@@ -539,9 +542,6 @@ insert_restart_trampoline(struct pt_regs *regs)
 		 * slot of the branch external instruction.
 		 */
 		regs->gr[31] -= 8;
-		/* Preserve original r28. */
-		regs->gr[28] = regs->orig_r28;
-
 		return;
 	}
 	default:
diff --git a/arch/parisc/kernel/syscall.S b/arch/parisc/kernel/syscall.S
index 82a52b2fb13f..54a9cbfc08ad 100644
--- a/arch/parisc/kernel/syscall.S
+++ b/arch/parisc/kernel/syscall.S
@@ -156,7 +156,7 @@ linux_gateway_entry:
 	STREG	%r26, TASK_PT_GR26(%r1)	 	/* 1st argument */
 	STREG	%r27, TASK_PT_GR27(%r1)		/* user dp */
 	STREG   %r28, TASK_PT_GR28(%r1)         /* return value 0 */
-	STREG   %r28, TASK_PT_ORIG_R28(%r1)     /* return value 0 (saved for signals) */
+	STREG   %r0, TASK_PT_ORIG_R28(%r1)      /* don't prohibit restarts */
 	STREG	%r29, TASK_PT_GR29(%r1)		/* return value 1 */
 	STREG	%r31, TASK_PT_GR31(%r1)		/* preserve syscall return ptr */
 	
-- 
cgit v1.2.3


From e3b880c6ee55e8858a75e3dcf6c3dda04d5e3605 Mon Sep 17 00:00:00 2001
From: Al Viro <viro@zeniv.linux.org.uk>
Date: Sat, 19 May 2012 01:13:01 -0400
Subject: parisc: don't bother looping in do_signal()

entry.S code had been looping until no pending signals are left
since 2005 anyway; no need to bother with that in do_signal()
itself.  If the failure to set a sigframe up raises SIGSEGV,
we'll just pick it up the next time around the loop(s) in entry.S
anyway.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
---
 arch/parisc/kernel/signal.c | 29 +++++++----------------------
 1 file changed, 7 insertions(+), 22 deletions(-)

diff --git a/arch/parisc/kernel/signal.c b/arch/parisc/kernel/signal.c
index 3790a3237172..537996955998 100644
--- a/arch/parisc/kernel/signal.c
+++ b/arch/parisc/kernel/signal.c
@@ -439,7 +439,7 @@ give_sigsegv:
  * OK, we're invoking a handler.
  */	
 
-static long
+static void
 handle_signal(unsigned long sig, siginfo_t *info, struct k_sigaction *ka,
 		struct pt_regs *regs, int in_syscall)
 {
@@ -449,7 +449,7 @@ handle_signal(unsigned long sig, siginfo_t *info, struct k_sigaction *ka,
 	
 	/* Set up the stack frame */
 	if (!setup_rt_frame(sig, ka, info, oldset, regs, in_syscall))
-		return 0;
+		return;
 
 	signal_delivered(sig, info, ka, regs, 
 		test_thread_flag(TIF_SINGLESTEP) ||
@@ -457,8 +457,6 @@ handle_signal(unsigned long sig, siginfo_t *info, struct k_sigaction *ka,
 
 	DBG(1,KERN_DEBUG "do_signal: Exit (success), regs->gr[28] = %ld\n",
 		regs->gr[28]);
-
-	return 1;
 }
 
 static inline void
@@ -570,30 +568,17 @@ do_signal(struct pt_regs *regs, long in_syscall)
 	DBG(1,"\ndo_signal: regs=0x%p, sr7 %#lx, in_syscall=%d\n",
 	       regs, regs->sr[7], in_syscall);
 
-	/* Everyone else checks to see if they are in kernel mode at
-	   this point and exits if that's the case.  I'm not sure why
-	   we would be called in that case, but for some reason we
-	   are. */
-
-	/* May need to force signal if handle_signal failed to deliver */
-	while (1) {
-		signr = get_signal_to_deliver(&info, &ka, regs, NULL);
-		DBG(3,"do_signal: signr = %d, regs->gr[28] = %ld\n", signr, regs->gr[28]); 
+	signr = get_signal_to_deliver(&info, &ka, regs, NULL);
+	DBG(3,"do_signal: signr = %d, regs->gr[28] = %ld\n", signr, regs->gr[28]); 
 	
-		if (signr <= 0)
-		  break;
-		
+	if (signr > 0) {
 		/* Restart a system call if necessary. */
 		if (in_syscall)
 			syscall_restart(regs, &ka);
 
-		/* Whee!  Actually deliver the signal.  If the
-		   delivery failed, we need to continue to iterate in
-		   this loop so we can deliver the SIGSEGV... */
-		if (handle_signal(signr, &info, &ka, regs, in_syscall))
-			return;
+		handle_signal(signr, &info, &ka, regs, in_syscall);
+		return;
 	}
-	/* end of while(1) looping forever if we can't force a signal */
 
 	/* Did we come from a system call? */
 	if (in_syscall)
-- 
cgit v1.2.3


From 64482bd8ef1700e98d96fb6e240c501d68c8371c Mon Sep 17 00:00:00 2001
From: Al Viro <viro@zeniv.linux.org.uk>
Date: Sun, 20 May 2012 11:59:03 -0400
Subject: parisc: decide whether to go to slow path (tracesys) based on thread
 flags

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
---
 arch/parisc/include/asm/thread_info.h | 2 ++
 arch/parisc/kernel/syscall.S          | 7 ++++---
 2 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/arch/parisc/include/asm/thread_info.h b/arch/parisc/include/asm/thread_info.h
index d0e2fe7d54a6..d1fb79a36f3d 100644
--- a/arch/parisc/include/asm/thread_info.h
+++ b/arch/parisc/include/asm/thread_info.h
@@ -74,6 +74,8 @@ struct thread_info {
 
 #define _TIF_USER_WORK_MASK     (_TIF_SIGPENDING | _TIF_NOTIFY_RESUME | \
                                  _TIF_NEED_RESCHED)
+#define _TIF_SYSCALL_TRACE_MASK (_TIF_SYSCALL_TRACE | _TIF_SINGLESTEP |	\
+				 _TIF_BLOCKSTEP)
 
 #define tsk_is_polling(t) test_tsk_thread_flag(t, TIF_POLLING_NRFLAG)
 
diff --git a/arch/parisc/kernel/syscall.S b/arch/parisc/kernel/syscall.S
index 54a9cbfc08ad..86742df0b194 100644
--- a/arch/parisc/kernel/syscall.S
+++ b/arch/parisc/kernel/syscall.S
@@ -180,9 +180,10 @@ linux_gateway_entry:
 
 	/* Are we being ptraced? */
 	mfctl	%cr30, %r1
-	LDREG	TI_TASK(%r1),%r1
-	ldw	TASK_PTRACE(%r1), %r1
-	bb,<,n	%r1,31,.Ltracesys
+	LDREG	TI_FLAGS(%r1),%r1
+	ldi	_TIF_SYSCALL_TRACE_MASK, %r19
+	and,COND(=) %r1, %r19, %r0
+	b,n	.Ltracesys
 	
 	/* Note!  We cannot use the syscall table that is mapped
 	nearby since the gateway page is mapped execute-only. */
-- 
cgit v1.2.3


From ff893577be5f56c97692678a7a3e3397c35e3cec Mon Sep 17 00:00:00 2001
From: Al Viro <viro@zeniv.linux.org.uk>
Date: Thu, 24 May 2012 03:12:25 -0400
Subject: h8300: trim _TIF_WORK_MASK

Only the three usual flags (NEED_RESCHED/SIGPENDING/NOTIFY_RESUME)
are looked at in the code checking _TIF_WORK_MASK on that one.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
---
 arch/h8300/include/asm/thread_info.h | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/h8300/include/asm/thread_info.h b/arch/h8300/include/asm/thread_info.h
index 63cc298edb67..ec2f7777c65a 100644
--- a/arch/h8300/include/asm/thread_info.h
+++ b/arch/h8300/include/asm/thread_info.h
@@ -95,7 +95,8 @@ static inline struct thread_info *current_thread_info(void)
 #define _TIF_NEED_RESCHED	(1<<TIF_NEED_RESCHED)
 #define _TIF_NOTIFY_RESUME	(1 << TIF_NOTIFY_RESUME)
 
-#define _TIF_WORK_MASK		0x0000FFFE	/* work to do on interrupt/exception return */
+#define _TIF_WORK_MASK		(_TIF_SIGPENDING | _TIF_NEED_RESCHED | \
+				 _TIF_NOTIFY_RESUME)
 
 #endif /* __KERNEL__ */
 
-- 
cgit v1.2.3


From fe9d7feab567085112ca02b238c839ca1b4cd9c5 Mon Sep 17 00:00:00 2001
From: Al Viro <viro@zeniv.linux.org.uk>
Date: Sat, 26 May 2012 00:25:15 -0400
Subject: unicore32: remove pointless test

we can get into work_pending only if at least one of NEED_RESCHED,
SIGPENDING or NOTIFY_RESUME is set.  So once we'd found no NEED_RESCHED,
there's no need to check that one of the other two is set.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
---
 arch/unicore32/kernel/entry.S | 2 --
 1 file changed, 2 deletions(-)

diff --git a/arch/unicore32/kernel/entry.S b/arch/unicore32/kernel/entry.S
index 00a259f9819e..dcb87ab19ddd 100644
--- a/arch/unicore32/kernel/entry.S
+++ b/arch/unicore32/kernel/entry.S
@@ -544,8 +544,6 @@ fast_work_pending:
 work_pending:
 	cand.a	r1, #_TIF_NEED_RESCHED
 	bne	work_resched
-	cand.a	r1, #_TIF_SIGPENDING|_TIF_NOTIFY_RESUME
-	beq	no_work_pending
 	mov	r0, sp				@ 'regs'
 	mov	r2, why				@ 'syscall'
 	cand.a	r1, #_TIF_SIGPENDING		@ delivering a signal?
-- 
cgit v1.2.3


From 969ae0bfb079de892a95aa4ca1e8ac76c4beb57c Mon Sep 17 00:00:00 2001
From: Al Viro <viro@zeniv.linux.org.uk>
Date: Sat, 26 May 2012 01:07:39 -0400
Subject: x86: get rid of duplicate code in case of CONFIG_VM86

no need to have the call of do_notify_resume() + checks around it
duplicated for vm86 case - a bit of rearranging of ifdefs and we'll
have a perfectly fine copy to jump back to.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
---
 arch/x86/kernel/entry_32.S | 17 ++++++-----------
 1 file changed, 6 insertions(+), 11 deletions(-)

diff --git a/arch/x86/kernel/entry_32.S b/arch/x86/kernel/entry_32.S
index b6bb69239296..fe4cc305d8da 100644
--- a/arch/x86/kernel/entry_32.S
+++ b/arch/x86/kernel/entry_32.S
@@ -618,6 +618,10 @@ work_notifysig:				# deal with pending signals and
 	movl %esp, %eax
 	jne work_notifysig_v86		# returning to kernel-space or
 					# vm86-space
+1:
+#else
+	movl %esp, %eax
+#endif
 	TRACE_IRQS_ON
 	ENABLE_INTERRUPTS(CLBR_NONE)
 	movb PT_CS(%esp), %bl
@@ -628,24 +632,15 @@ work_notifysig:				# deal with pending signals and
 	call do_notify_resume
 	jmp resume_userspace
 
+#ifdef CONFIG_VM86
 	ALIGN
 work_notifysig_v86:
 	pushl_cfi %ecx			# save ti_flags for do_notify_resume
 	call save_v86_state		# %eax contains pt_regs pointer
 	popl_cfi %ecx
 	movl %eax, %esp
-#else
-	movl %esp, %eax
+	jmp 1b
 #endif
-	TRACE_IRQS_ON
-	ENABLE_INTERRUPTS(CLBR_NONE)
-	movb PT_CS(%esp), %bl
-	andb $SEGMENT_RPL_MASK, %bl
-	cmpb $USER_RPL, %bl
-	jb resume_kernel
-	xorl %edx, %edx
-	call do_notify_resume
-	jmp resume_userspace
 END(work_pending)
 
 	# perform syscall exit tracing
-- 
cgit v1.2.3


From 7fa6239dac3f6695393578f8f840b9cd11aa5476 Mon Sep 17 00:00:00 2001
From: Al Viro <viro@zeniv.linux.org.uk>
Date: Sat, 26 May 2012 22:17:47 -0400
Subject: frv: no need to raise SIGTRAP in setup_frame()

signal_delivered() will do it in the same case...

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
---
 arch/frv/kernel/signal.c | 8 --------
 1 file changed, 8 deletions(-)

diff --git a/arch/frv/kernel/signal.c b/arch/frv/kernel/signal.c
index 864c2f0d497b..a03e3cccd98d 100644
--- a/arch/frv/kernel/signal.c
+++ b/arch/frv/kernel/signal.c
@@ -298,10 +298,6 @@ static int setup_frame(int sig, struct k_sigaction *ka, sigset_t *set)
 	__frame->lr   = (unsigned long) &frame->retcode;
 	__frame->gr8  = sig;
 
-	/* the tracer may want to single-step inside the handler */
-	if (test_thread_flag(TIF_SINGLESTEP))
-		ptrace_notify(SIGTRAP);
-
 #if DEBUG_SIG
 	printk("SIG deliver %d (%s:%d): sp=%p pc=%lx ra=%p\n",
 	       sig, current->comm, current->pid, frame, __frame->pc,
@@ -400,10 +396,6 @@ static int setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
 	__frame->gr8 = sig;
 	__frame->gr9 = (unsigned long) &frame->info;
 
-	/* the tracer may want to single-step inside the handler */
-	if (test_thread_flag(TIF_SINGLESTEP))
-		ptrace_notify(SIGTRAP);
-
 #if DEBUG_SIG
 	printk("SIG deliver %d (%s:%d): sp=%p pc=%lx ra=%p\n",
 	       sig, current->comm, current->pid, frame, __frame->pc,
-- 
cgit v1.2.3


From 548916e9f59ba35174122e33c48ac744410973fa Mon Sep 17 00:00:00 2001
From: Al Viro <viro@zeniv.linux.org.uk>
Date: Sat, 26 May 2012 22:20:22 -0400
Subject: mn10300: don't bother with SIGTRAP in setup_frame()

... just tell signal_delivered() to do it.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
---
 arch/mn10300/kernel/signal.c | 8 --------
 1 file changed, 8 deletions(-)

diff --git a/arch/mn10300/kernel/signal.c b/arch/mn10300/kernel/signal.c
index b2c0ac715128..f570b3085ef9 100644
--- a/arch/mn10300/kernel/signal.c
+++ b/arch/mn10300/kernel/signal.c
@@ -317,10 +317,6 @@ static int setup_frame(int sig, struct k_sigaction *ka, sigset_t *set,
 	regs->d0 = sig;
 	regs->d1 = (unsigned long) &frame->sc;
 
-	/* the tracer may want to single-step inside the handler */
-	if (test_thread_flag(TIF_SINGLESTEP))
-		ptrace_notify(SIGTRAP);
-
 #if DEBUG_SIG
 	printk(KERN_DEBUG "SIG deliver %d (%s:%d): sp=%p pc=%lx ra=%p\n",
 	       sig, current->comm, current->pid, frame, regs->pc,
@@ -398,10 +394,6 @@ static int setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
 	regs->d0 = sig;
 	regs->d1 = (long) &frame->info;
 
-	/* the tracer may want to single-step inside the handler */
-	if (test_thread_flag(TIF_SINGLESTEP))
-		ptrace_notify(SIGTRAP);
-
 #if DEBUG_SIG
 	printk(KERN_DEBUG "SIG deliver %d (%s:%d): sp=%p pc=%lx ra=%p\n",
 	       sig, current->comm, current->pid, frame, regs->pc,
-- 
cgit v1.2.3


From 7f1c6168259f8d75c08f64aae3c8c93b2801eb37 Mon Sep 17 00:00:00 2001
From: Al Viro <viro@zeniv.linux.org.uk>
Date: Mon, 17 Sep 2012 18:42:01 -0400
Subject: microblaze: don't bother with SIGTRAP in setup_rt_frame()

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
---
 arch/microblaze/kernel/signal.c | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

diff --git a/arch/microblaze/kernel/signal.c b/arch/microblaze/kernel/signal.c
index 76b9722557db..0d27fdbb30fd 100644
--- a/arch/microblaze/kernel/signal.c
+++ b/arch/microblaze/kernel/signal.c
@@ -254,10 +254,6 @@ static int setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
 
 	set_fs(USER_DS);
 
-	/* the tracer may want to single-step inside the handler */
-	if (test_thread_flag(TIF_SINGLESTEP))
-		ptrace_notify(SIGTRAP);
-
 #ifdef DEBUG_SIG
 	printk(KERN_INFO "SIG deliver (%s:%d): sp=%p pc=%08lx\n",
 		current->comm, current->pid, frame, regs->pc);
@@ -323,7 +319,8 @@ handle_signal(unsigned long sig, struct k_sigaction *ka,
 	if (ret)
 		return;
 
-	signal_delivered(sig, info, ka, regs, 0);
+	signal_delivered(sig, info, ka, regs,
+			test_thread_flag(TIF_SINGLESTEP));
 }
 
 /*
-- 
cgit v1.2.3


From a925328de88af2f93dbe189fdac436c389d2e5d5 Mon Sep 17 00:00:00 2001
From: Al Viro <viro@zeniv.linux.org.uk>
Date: Sat, 26 May 2012 22:22:53 -0400
Subject: tile: don't bother with SIGTRAP in setup_frame

Tell signal_delivered() to do it instead.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
---
 arch/tile/kernel/compat_signal.c |  9 ---------
 arch/tile/kernel/signal.c        | 12 ++----------
 2 files changed, 2 insertions(+), 19 deletions(-)

diff --git a/arch/tile/kernel/compat_signal.c b/arch/tile/kernel/compat_signal.c
index 474571b84085..3690f0199f09 100644
--- a/arch/tile/kernel/compat_signal.c
+++ b/arch/tile/kernel/compat_signal.c
@@ -411,15 +411,6 @@ int compat_setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
 	regs->regs[1] = ptr_to_compat_reg(&frame->info);
 	regs->regs[2] = ptr_to_compat_reg(&frame->uc);
 	regs->flags |= PT_FLAGS_CALLER_SAVES;
-
-	/*
-	 * Notify any tracer that was single-stepping it.
-	 * The tracer may want to single-step inside the
-	 * handler too.
-	 */
-	if (test_thread_flag(TIF_SINGLESTEP))
-		ptrace_notify(SIGTRAP);
-
 	return 0;
 
 give_sigsegv:
diff --git a/arch/tile/kernel/signal.c b/arch/tile/kernel/signal.c
index e29b0553211d..67efb656d104 100644
--- a/arch/tile/kernel/signal.c
+++ b/arch/tile/kernel/signal.c
@@ -219,15 +219,6 @@ static int setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
 	regs->regs[1] = (unsigned long) &frame->info;
 	regs->regs[2] = (unsigned long) &frame->uc;
 	regs->flags |= PT_FLAGS_CALLER_SAVES;
-
-	/*
-	 * Notify any tracer that was single-stepping it.
-	 * The tracer may want to single-step inside the
-	 * handler too.
-	 */
-	if (test_thread_flag(TIF_SINGLESTEP))
-		ptrace_notify(SIGTRAP);
-
 	return 0;
 
 give_sigsegv:
@@ -278,7 +269,8 @@ static void handle_signal(unsigned long sig, siginfo_t *info,
 		ret = setup_rt_frame(sig, ka, info, oldset, regs);
 	if (ret)
 		return;
-	signal_delivered(sig, info, ka, regs, 0);
+	signal_delivered(sig, info, ka, regs,
+			test_thread_flag(TIF_SINGLESTEP));
 }
 
 /*
-- 
cgit v1.2.3


From 971ceb17dc702fa93fe4b4b7b293248c160bf880 Mon Sep 17 00:00:00 2001
From: Al Viro <viro@zeniv.linux.org.uk>
Date: Thu, 31 May 2012 22:24:57 -0400
Subject: avr32: trim masks

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
---
 arch/avr32/include/asm/thread_info.h | 13 ++++++-------
 1 file changed, 6 insertions(+), 7 deletions(-)

diff --git a/arch/avr32/include/asm/thread_info.h b/arch/avr32/include/asm/thread_info.h
index dc0c45721499..6dc62e1f94c7 100644
--- a/arch/avr32/include/asm/thread_info.h
+++ b/arch/avr32/include/asm/thread_info.h
@@ -89,6 +89,7 @@ static inline struct thread_info *current_thread_info(void)
 #define _TIF_SYSCALL_TRACE	(1 << TIF_SYSCALL_TRACE)
 #define _TIF_SIGPENDING		(1 << TIF_SIGPENDING)
 #define _TIF_NEED_RESCHED	(1 << TIF_NEED_RESCHED)
+#define _TIF_BREAKPOINT		(1 << TIF_BREAKPOINT)
 #define _TIF_SINGLE_STEP	(1 << TIF_SINGLE_STEP)
 #define _TIF_MEMDIE		(1 << TIF_MEMDIE)
 #define _TIF_CPU_GOING_TO_SLEEP (1 << TIF_CPU_GOING_TO_SLEEP)
@@ -98,16 +99,14 @@ static inline struct thread_info *current_thread_info(void)
 
 /* work to do on interrupt/exception return */
 #define _TIF_WORK_MASK				\
-	((1 << TIF_SIGPENDING)			\
+	(_TIF_SIGPENDING			\
 	 | _TIF_NOTIFY_RESUME			\
-	 | (1 << TIF_NEED_RESCHED)		\
-	 | (1 << TIF_BREAKPOINT)		\
-	 | (1 << TIF_RESTORE_SIGMASK))
+	 | _TIF_NEED_RESCHED			\
+	 | _TIF_BREAKPOINT)
 
 /* work to do on any return to userspace */
-#define _TIF_ALLWORK_MASK	(_TIF_WORK_MASK | (1 << TIF_SYSCALL_TRACE) | \
-				 _TIF_NOTIFY_RESUME)
+#define _TIF_ALLWORK_MASK	(_TIF_WORK_MASK | _TIF_SYSCALL_TRACE)
 /* work to do on return from debug mode */
-#define _TIF_DBGWORK_MASK	(_TIF_WORK_MASK & ~(1 << TIF_BREAKPOINT))
+#define _TIF_DBGWORK_MASK	(_TIF_WORK_MASK & ~_TIF_BREAKPOINT)
 
 #endif /* __ASM_AVR32_THREAD_INFO_H */
-- 
cgit v1.2.3


From d70745bb43d9dba979a26e166463b330fa1ef470 Mon Sep 17 00:00:00 2001
From: Al Viro <viro@zeniv.linux.org.uk>
Date: Thu, 31 May 2012 22:25:28 -0400
Subject: m32r: trim masks

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
---
 arch/m32r/include/asm/thread_info.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/m32r/include/asm/thread_info.h b/arch/m32r/include/asm/thread_info.h
index aad1c3a913d9..c074f4c2e858 100644
--- a/arch/m32r/include/asm/thread_info.h
+++ b/arch/m32r/include/asm/thread_info.h
@@ -131,8 +131,8 @@ static inline unsigned int get_thread_fault_code(void)
 #define _TIF_NOTIFY_RESUME	(1<<TIF_NOTIFY_RESUME)
 #define _TIF_USEDFPU		(1<<TIF_USEDFPU)
 
-#define _TIF_WORK_MASK		0x0000FFFE	/* work to do on interrupt/exception return */
-#define _TIF_ALLWORK_MASK	0x0000FFFF	/* work to do on any return to u-space */
+#define _TIF_WORK_MASK		(_TIF_SIGPENDING | _TIF_NEED_RESCHED | _TIF_NOTIFY_RESUME)
+#define _TIF_ALLWORK_MASK	(_TIF_WORK_MASK | _TIF_SYSCALL_TRACE)
 
 /*
  * Thread-synchronous status.
-- 
cgit v1.2.3


From 3cffdc8c3a4445bb3a4b1b31b10867edeb9fa288 Mon Sep 17 00:00:00 2001
From: Richard Weinberger <richard@nod.at>
Date: Sat, 26 May 2012 01:57:10 +0200
Subject: Uninclude linux/freezer.h

This include is no longer needed.
(seems to be a leftover from try_to_freeze())

Signed-off-by: Richard Weinberger <richard@nod.at>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
---
 arch/arm/kernel/signal.c        | 1 -
 arch/avr32/kernel/signal.c      | 1 -
 arch/blackfin/kernel/signal.c   | 1 -
 arch/frv/kernel/signal.c        | 1 -
 arch/h8300/kernel/signal.c      | 1 -
 arch/hexagon/kernel/signal.c    | 1 -
 arch/m32r/kernel/signal.c       | 1 -
 arch/powerpc/kernel/signal_32.c | 1 -
 arch/sh/kernel/signal_32.c      | 1 -
 arch/sh/kernel/signal_64.c      | 1 -
 arch/unicore32/kernel/signal.c  | 1 -
 arch/xtensa/kernel/signal.c     | 1 -
 12 files changed, 12 deletions(-)

diff --git a/arch/arm/kernel/signal.c b/arch/arm/kernel/signal.c
index f27789e4e38a..56f72d257ebd 100644
--- a/arch/arm/kernel/signal.c
+++ b/arch/arm/kernel/signal.c
@@ -10,7 +10,6 @@
 #include <linux/errno.h>
 #include <linux/signal.h>
 #include <linux/personality.h>
-#include <linux/freezer.h>
 #include <linux/uaccess.h>
 #include <linux/tracehook.h>
 
diff --git a/arch/avr32/kernel/signal.c b/arch/avr32/kernel/signal.c
index d552a854dacc..5e01c3a40ced 100644
--- a/arch/avr32/kernel/signal.c
+++ b/arch/avr32/kernel/signal.c
@@ -15,7 +15,6 @@
 #include <linux/errno.h>
 #include <linux/ptrace.h>
 #include <linux/unistd.h>
-#include <linux/freezer.h>
 #include <linux/tracehook.h>
 
 #include <asm/uaccess.h>
diff --git a/arch/blackfin/kernel/signal.c b/arch/blackfin/kernel/signal.c
index 6682b73a8523..6ed20a1a4af9 100644
--- a/arch/blackfin/kernel/signal.c
+++ b/arch/blackfin/kernel/signal.c
@@ -10,7 +10,6 @@
 #include <linux/tty.h>
 #include <linux/personality.h>
 #include <linux/binfmts.h>
-#include <linux/freezer.h>
 #include <linux/uaccess.h>
 #include <linux/tracehook.h>
 
diff --git a/arch/frv/kernel/signal.c b/arch/frv/kernel/signal.c
index a03e3cccd98d..535810a3217a 100644
--- a/arch/frv/kernel/signal.c
+++ b/arch/frv/kernel/signal.c
@@ -20,7 +20,6 @@
 #include <linux/ptrace.h>
 #include <linux/unistd.h>
 #include <linux/personality.h>
-#include <linux/freezer.h>
 #include <linux/tracehook.h>
 #include <asm/ucontext.h>
 #include <asm/uaccess.h>
diff --git a/arch/h8300/kernel/signal.c b/arch/h8300/kernel/signal.c
index 5adaadaf9218..0e81b96c642f 100644
--- a/arch/h8300/kernel/signal.c
+++ b/arch/h8300/kernel/signal.c
@@ -38,7 +38,6 @@
 #include <linux/personality.h>
 #include <linux/tty.h>
 #include <linux/binfmts.h>
-#include <linux/freezer.h>
 #include <linux/tracehook.h>
 
 #include <asm/setup.h>
diff --git a/arch/hexagon/kernel/signal.c b/arch/hexagon/kernel/signal.c
index 304b0808d072..1ea16bec7b91 100644
--- a/arch/hexagon/kernel/signal.c
+++ b/arch/hexagon/kernel/signal.c
@@ -20,7 +20,6 @@
 
 #include <linux/linkage.h>
 #include <linux/syscalls.h>
-#include <linux/freezer.h>
 #include <linux/tracehook.h>
 #include <asm/registers.h>
 #include <asm/thread_info.h>
diff --git a/arch/m32r/kernel/signal.c b/arch/m32r/kernel/signal.c
index c5101911b49a..6e3c26a1607c 100644
--- a/arch/m32r/kernel/signal.c
+++ b/arch/m32r/kernel/signal.c
@@ -20,7 +20,6 @@
 #include <linux/unistd.h>
 #include <linux/stddef.h>
 #include <linux/personality.h>
-#include <linux/freezer.h>
 #include <linux/tracehook.h>
 #include <asm/cacheflush.h>
 #include <asm/ucontext.h>
diff --git a/arch/powerpc/kernel/signal_32.c b/arch/powerpc/kernel/signal_32.c
index 8b4c049aee20..804e323c139d 100644
--- a/arch/powerpc/kernel/signal_32.c
+++ b/arch/powerpc/kernel/signal_32.c
@@ -35,7 +35,6 @@
 #include <linux/stddef.h>
 #include <linux/tty.h>
 #include <linux/binfmts.h>
-#include <linux/freezer.h>
 #endif
 
 #include <asm/uaccess.h>
diff --git a/arch/sh/kernel/signal_32.c b/arch/sh/kernel/signal_32.c
index d6b7b6154f87..2f1f65356c0c 100644
--- a/arch/sh/kernel/signal_32.c
+++ b/arch/sh/kernel/signal_32.c
@@ -22,7 +22,6 @@
 #include <linux/elf.h>
 #include <linux/personality.h>
 #include <linux/binfmts.h>
-#include <linux/freezer.h>
 #include <linux/io.h>
 #include <linux/tracehook.h>
 #include <asm/ucontext.h>
diff --git a/arch/sh/kernel/signal_64.c b/arch/sh/kernel/signal_64.c
index 6b5b3dfe886b..23853814bd17 100644
--- a/arch/sh/kernel/signal_64.c
+++ b/arch/sh/kernel/signal_64.c
@@ -18,7 +18,6 @@
 #include <linux/errno.h>
 #include <linux/wait.h>
 #include <linux/personality.h>
-#include <linux/freezer.h>
 #include <linux/ptrace.h>
 #include <linux/unistd.h>
 #include <linux/stddef.h>
diff --git a/arch/unicore32/kernel/signal.c b/arch/unicore32/kernel/signal.c
index 8adedb37720a..b8b2ffd774d6 100644
--- a/arch/unicore32/kernel/signal.c
+++ b/arch/unicore32/kernel/signal.c
@@ -12,7 +12,6 @@
 #include <linux/errno.h>
 #include <linux/signal.h>
 #include <linux/personality.h>
-#include <linux/freezer.h>
 #include <linux/uaccess.h>
 #include <linux/tracehook.h>
 #include <linux/elf.h>
diff --git a/arch/xtensa/kernel/signal.c b/arch/xtensa/kernel/signal.c
index 0cbe67a2248a..63c566f627bc 100644
--- a/arch/xtensa/kernel/signal.c
+++ b/arch/xtensa/kernel/signal.c
@@ -19,7 +19,6 @@
 #include <linux/errno.h>
 #include <linux/ptrace.h>
 #include <linux/personality.h>
-#include <linux/freezer.h>
 #include <linux/tracehook.h>
 
 #include <asm/ucontext.h>
-- 
cgit v1.2.3


From 12f79be93d94698778ff2b3f921073fc5f6780d6 Mon Sep 17 00:00:00 2001
From: Al Viro <viro@zeniv.linux.org.uk>
Date: Sat, 26 May 2012 21:44:21 -0400
Subject: alpha: don't open-code trace_report_syscall_{enter,exit}

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
---
 arch/alpha/kernel/entry.S  | 13 ++++++-------
 arch/alpha/kernel/ptrace.c | 32 +++++++++++++-------------------
 2 files changed, 19 insertions(+), 26 deletions(-)

diff --git a/arch/alpha/kernel/entry.S b/arch/alpha/kernel/entry.S
index 7e43e1156d10..2a359c9ee3cd 100644
--- a/arch/alpha/kernel/entry.S
+++ b/arch/alpha/kernel/entry.S
@@ -418,11 +418,10 @@ $work_notifysig:
 strace:
 	/* set up signal stack, call syscall_trace */
 	bsr	$1, do_switch_stack
-	jsr	$26, syscall_trace
+	jsr	$26, syscall_trace_enter /* returns the syscall number */
 	bsr	$1, undo_switch_stack
 
-	/* get the system call number and the arguments back.. */
-	ldq	$0, 0($sp)
+	/* get the arguments back.. */
 	ldq	$16, SP_OFF+24($sp)
 	ldq	$17, SP_OFF+32($sp)
 	ldq	$18, SP_OFF+40($sp)
@@ -449,7 +448,7 @@ $strace_success:
 	stq	$0, 0($sp)		/* save return value */
 
 	bsr	$1, do_switch_stack
-	jsr	$26, syscall_trace
+	jsr	$26, syscall_trace_leave
 	bsr	$1, undo_switch_stack
 	br	$31, ret_from_sys_call
 
@@ -467,7 +466,7 @@ $strace_error:
 	bsr	$1, do_switch_stack
 	mov	$19, $9		/* save old syscall number */
 	mov	$20, $10	/* save old a3 */
-	jsr	$26, syscall_trace
+	jsr	$26, syscall_trace_leave
 	mov	$9, $19
 	mov	$10, $20
 	bsr	$1, undo_switch_stack
@@ -698,7 +697,7 @@ sys_sigreturn:
 	lda	$sp, -SWITCH_STACK_SIZE($sp)
 	jsr	$26, do_sigreturn
 	bne	$9, 1f
-	jsr	$26, syscall_trace
+	jsr	$26, syscall_trace_leave
 1:	br	$1, undo_switch_stack
 	br	ret_from_sys_call
 .end sys_sigreturn
@@ -715,7 +714,7 @@ sys_rt_sigreturn:
 	lda	$sp, -SWITCH_STACK_SIZE($sp)
 	jsr	$26, do_rt_sigreturn
 	bne	$9, 1f
-	jsr	$26, syscall_trace
+	jsr	$26, syscall_trace_leave
 1:	br	$1, undo_switch_stack
 	br	ret_from_sys_call
 .end sys_rt_sigreturn
diff --git a/arch/alpha/kernel/ptrace.c b/arch/alpha/kernel/ptrace.c
index 54616f496aed..2a4a80ff4a20 100644
--- a/arch/alpha/kernel/ptrace.c
+++ b/arch/alpha/kernel/ptrace.c
@@ -13,6 +13,7 @@
 #include <linux/user.h>
 #include <linux/security.h>
 #include <linux/signal.h>
+#include <linux/tracehook.h>
 
 #include <asm/uaccess.h>
 #include <asm/pgtable.h>
@@ -312,25 +313,18 @@ long arch_ptrace(struct task_struct *child, long request,
 	return ret;
 }
 
+asmlinkage unsigned long syscall_trace_enter(void)
+{
+	unsigned long ret = 0;
+	if (test_thread_flag(TIF_SYSCALL_TRACE) &&
+	    tracehook_report_syscall_entry(current_pt_regs()))
+		ret = -1UL;
+	return ret ?: current_pt_regs()->r0;
+}
+
 asmlinkage void
-syscall_trace(void)
+syscall_trace_leave(void)
 {
-	if (!test_thread_flag(TIF_SYSCALL_TRACE))
-		return;
-	if (!(current->ptrace & PT_PTRACED))
-		return;
-	/* The 0x80 provides a way for the tracing parent to distinguish
-	   between a syscall stop and SIGTRAP delivery */
-	ptrace_notify(SIGTRAP | ((current->ptrace & PT_TRACESYSGOOD)
-				 ? 0x80 : 0));
-
-	/*
-	 * This isn't the same as continuing with a signal, but it will do
-	 * for normal use.  strace only continues with a signal if the
-	 * stopping signal is not SIGTRAP.  -brl
-	 */
-	if (current->exit_code) {
-		send_sig(current->exit_code, current, 1);
-		current->exit_code = 0;
-	}
+	if (test_thread_flag(TIF_SYSCALL_TRACE))
+		tracehook_report_syscall_exit(current_pt_regs(), 0);
 }
-- 
cgit v1.2.3