Merge Linus master into drm-next

The merge is clean, but the arm build fails afterwards,
due to API changes in the regulator tree.

I've included the patch into the merge to fix the build.

Signed-off-by: Dave Airlie <airlied@redhat.com>

1 files changed, 51 insertions, 151 deletions

diff --git a/arch/um/os-Linux/skas/process.c b/arch/um/os-Linux/skas/process.c
index 908579f2b0ab..7a9777570a62 100644
--- a/arch/um/os-Linux/skas/process.c
+++ b/arch/um/os-Linux/skas/process.c
@@ -16,11 +16,9 @@
 #include <kern_util.h>
 #include <mem.h>
 #include <os.h>
-#include <proc_mm.h>
 #include <ptrace_user.h>
 #include <registers.h>
 #include <skas.h>
-#include <skas_ptrace.h>
 #include <sysdep/stub.h>
 
 int is_skas_winch(int pid, int fd, void *data)
@@ -91,50 +89,33 @@ extern unsigned long current_stub_stack(void);
 static void get_skas_faultinfo(int pid, struct faultinfo *fi)
 {
 	int err;
+	unsigned long fpregs[FP_SIZE];
 
-	if (ptrace_faultinfo) {
-		err = ptrace(PTRACE_FAULTINFO, pid, 0, fi);
-		if (err) {
-			printk(UM_KERN_ERR "get_skas_faultinfo - "
-			       "PTRACE_FAULTINFO failed, errno = %d\n", errno);
-			fatal_sigsegv();
-		}
-
-		/* Special handling for i386, which has different structs */
-		if (sizeof(struct ptrace_faultinfo) < sizeof(struct faultinfo))
-			memset((char *)fi + sizeof(struct ptrace_faultinfo), 0,
-			       sizeof(struct faultinfo) -
-			       sizeof(struct ptrace_faultinfo));
+	err = get_fp_registers(pid, fpregs);
+	if (err < 0) {
+		printk(UM_KERN_ERR "save_fp_registers returned %d\n",
+		       err);
+		fatal_sigsegv();
 	}
-	else {
-		unsigned long fpregs[FP_SIZE];
-
-		err = get_fp_registers(pid, fpregs);
-		if (err < 0) {
-			printk(UM_KERN_ERR "save_fp_registers returned %d\n",
-			       err);
-			fatal_sigsegv();
-		}
-		err = ptrace(PTRACE_CONT, pid, 0, SIGSEGV);
-		if (err) {
-			printk(UM_KERN_ERR "Failed to continue stub, pid = %d, "
-			       "errno = %d\n", pid, errno);
-			fatal_sigsegv();
-		}
-		wait_stub_done(pid);
+	err = ptrace(PTRACE_CONT, pid, 0, SIGSEGV);
+	if (err) {
+		printk(UM_KERN_ERR "Failed to continue stub, pid = %d, "
+		       "errno = %d\n", pid, errno);
+		fatal_sigsegv();
+	}
+	wait_stub_done(pid);
 
-		/*
-		 * faultinfo is prepared by the stub-segv-handler at start of
-		 * the stub stack page. We just have to copy it.
-		 */
-		memcpy(fi, (void *)current_stub_stack(), sizeof(*fi));
+	/*
+	 * faultinfo is prepared by the stub-segv-handler at start of
+	 * the stub stack page. We just have to copy it.
+	 */
+	memcpy(fi, (void *)current_stub_stack(), sizeof(*fi));
 
-		err = put_fp_registers(pid, fpregs);
-		if (err < 0) {
-			printk(UM_KERN_ERR "put_fp_registers returned %d\n",
-			       err);
-			fatal_sigsegv();
-		}
+	err = put_fp_registers(pid, fpregs);
+	if (err < 0) {
+		printk(UM_KERN_ERR "put_fp_registers returned %d\n",
+		       err);
+		fatal_sigsegv();
 	}
 }
 
@@ -198,7 +179,8 @@ extern int __syscall_stub_start;
 static int userspace_tramp(void *stack)
 {
 	void *addr;
-	int err;
+	int err, fd;
+	unsigned long long offset;
 
 	ptrace(PTRACE_TRACEME, 0, 0, 0);
 
@@ -211,36 +193,32 @@ static int userspace_tramp(void *stack)
 		exit(1);
 	}
 
-	if (!proc_mm) {
-		/*
-		 * This has a pte, but it can't be mapped in with the usual
-		 * tlb_flush mechanism because this is part of that mechanism
-		 */
-		int fd;
-		unsigned long long offset;
-		fd = phys_mapping(to_phys(&__syscall_stub_start), &offset);
-		addr = mmap64((void *) STUB_CODE, UM_KERN_PAGE_SIZE,
-			      PROT_EXEC, MAP_FIXED | MAP_PRIVATE, fd, offset);
+	/*
+	 * This has a pte, but it can't be mapped in with the usual
+	 * tlb_flush mechanism because this is part of that mechanism
+	 */
+	fd = phys_mapping(to_phys(&__syscall_stub_start), &offset);
+	addr = mmap64((void *) STUB_CODE, UM_KERN_PAGE_SIZE,
+		      PROT_EXEC, MAP_FIXED | MAP_PRIVATE, fd, offset);
+	if (addr == MAP_FAILED) {
+		printk(UM_KERN_ERR "mapping mmap stub at 0x%lx failed, "
+		       "errno = %d\n", STUB_CODE, errno);
+		exit(1);
+	}
+
+	if (stack != NULL) {
+		fd = phys_mapping(to_phys(stack), &offset);
+		addr = mmap((void *) STUB_DATA,
+			    UM_KERN_PAGE_SIZE, PROT_READ | PROT_WRITE,
+			    MAP_FIXED | MAP_SHARED, fd, offset);
 		if (addr == MAP_FAILED) {
-			printk(UM_KERN_ERR "mapping mmap stub at 0x%lx failed, "
-			       "errno = %d\n", STUB_CODE, errno);
+			printk(UM_KERN_ERR "mapping segfault stack "
+			       "at 0x%lx failed, errno = %d\n",
+			       STUB_DATA, errno);
 			exit(1);
 		}
-
-		if (stack != NULL) {
-			fd = phys_mapping(to_phys(stack), &offset);
-			addr = mmap((void *) STUB_DATA,
-				    UM_KERN_PAGE_SIZE, PROT_READ | PROT_WRITE,
-				    MAP_FIXED | MAP_SHARED, fd, offset);
-			if (addr == MAP_FAILED) {
-				printk(UM_KERN_ERR "mapping segfault stack "
-				       "at 0x%lx failed, errno = %d\n",
-				       STUB_DATA, errno);
-				exit(1);
-			}
-		}
 	}
-	if (!ptrace_faultinfo && (stack != NULL)) {
+	if (stack != NULL) {
 		struct sigaction sa;
 
 		unsigned long v = STUB_CODE +
@@ -286,11 +264,7 @@ int start_userspace(unsigned long stub_stack)
 
 	sp = (unsigned long) stack + UM_KERN_PAGE_SIZE - sizeof(void *);
 
-	flags = CLONE_FILES;
-	if (proc_mm)
-		flags |= CLONE_VM;
-	else
-		flags |= SIGCHLD;
+	flags = CLONE_FILES | SIGCHLD;
 
 	pid = clone(userspace_tramp, (void *) sp, flags, (void *) stub_stack);
 	if (pid < 0) {
@@ -413,8 +387,7 @@ void userspace(struct uml_pt_regs *regs)
 
 			switch (sig) {
 			case SIGSEGV:
-				if (PTRACE_FULL_FAULTINFO ||
-				    !ptrace_faultinfo) {
+				if (PTRACE_FULL_FAULTINFO) {
 					get_skas_faultinfo(pid,
 							   &regs->faultinfo);
 					(*sig_info[SIGSEGV])(SIGSEGV, (struct siginfo *)&si,
@@ -571,67 +544,6 @@ int copy_context_skas0(unsigned long new_stack, int pid)
 	return err;
 }
 
-/*
- * This is used only, if stub pages are needed, while proc_mm is
- * available. Opening /proc/mm creates a new mm_context, which lacks
- * the stub-pages. Thus, we map them using /proc/mm-fd
- */
-int map_stub_pages(int fd, unsigned long code, unsigned long data,
-		   unsigned long stack)
-{
-	struct proc_mm_op mmop;
-	int n;
-	unsigned long long code_offset;
-	int code_fd = phys_mapping(to_phys((void *) &__syscall_stub_start),
-				   &code_offset);
-
-	mmop = ((struct proc_mm_op) { .op        = MM_MMAP,
-				      .u         =
-				      { .mmap    =
-					{ .addr    = code,
-					  .len     = UM_KERN_PAGE_SIZE,
-					  .prot    = PROT_EXEC,
-					  .flags   = MAP_FIXED | MAP_PRIVATE,
-					  .fd      = code_fd,
-					  .offset  = code_offset
-	} } });
-	CATCH_EINTR(n = write(fd, &mmop, sizeof(mmop)));
-	if (n != sizeof(mmop)) {
-		n = errno;
-		printk(UM_KERN_ERR "mmap args - addr = 0x%lx, fd = %d, "
-		       "offset = %llx\n", code, code_fd,
-		       (unsigned long long) code_offset);
-		printk(UM_KERN_ERR "map_stub_pages : /proc/mm map for code "
-		       "failed, err = %d\n", n);
-		return -n;
-	}
-
-	if (stack) {
-		unsigned long long map_offset;
-		int map_fd = phys_mapping(to_phys((void *)stack), &map_offset);
-		mmop = ((struct proc_mm_op)
-				{ .op        = MM_MMAP,
-				  .u         =
-				  { .mmap    =
-				    { .addr    = data,
-				      .len     = UM_KERN_PAGE_SIZE,
-				      .prot    = PROT_READ | PROT_WRITE,
-				      .flags   = MAP_FIXED | MAP_SHARED,
-				      .fd      = map_fd,
-				      .offset  = map_offset
-		} } });
-		CATCH_EINTR(n = write(fd, &mmop, sizeof(mmop)));
-		if (n != sizeof(mmop)) {
-			n = errno;
-			printk(UM_KERN_ERR "map_stub_pages : /proc/mm map for "
-			       "data failed, err = %d\n", n);
-			return -n;
-		}
-	}
-
-	return 0;
-}
-
 void new_thread(void *stack, jmp_buf *buf, void (*handler)(void))
 {
 	(*buf)[0].JB_IP = (unsigned long) handler;
@@ -674,7 +586,7 @@ int start_idle_thread(void *stack, jmp_buf *switch_buf)
 	n = setjmp(initial_jmpbuf);
 	switch (n) {
 	case INIT_JMP_NEW_THREAD:
-		(*switch_buf)[0].JB_IP = (unsigned long) new_thread_handler;
+		(*switch_buf)[0].JB_IP = (unsigned long) uml_finishsetup;
 		(*switch_buf)[0].JB_SP = (unsigned long) stack +
 			UM_THREAD_SIZE - sizeof(void *);
 		break;
@@ -728,17 +640,5 @@ void reboot_skas(void)
 
 void __switch_mm(struct mm_id *mm_idp)
 {
-	int err;
-
-	/* FIXME: need cpu pid in __switch_mm */
-	if (proc_mm) {
-		err = ptrace(PTRACE_SWITCH_MM, userspace_pid[0], 0,
-			     mm_idp->u.mm_fd);
-		if (err) {
-			printk(UM_KERN_ERR "__switch_mm - PTRACE_SWITCH_MM "
-			       "failed, errno = %d\n", errno);
-			fatal_sigsegv();
-		}
-	}
-	else userspace_pid[0] = mm_idp->u.pid;
+	userspace_pid[0] = mm_idp->u.pid;
 }