Merge tag 'csky-for-linus-6.0-rc1' of https://github.com/c-sky/csky-linux

Pull csky updates from Guo Ren:

 - Add jump-label implementation

 - Add qspinlock support

 - Enable ARCH_INLINE_READ*/WRITE*/SPIN*

 - Some fixups and a coding convention

* tag 'csky-for-linus-6.0-rc1' of https://github.com/c-sky/csky-linux:
  csky: abiv1: Fixup compile error
  csky: cmpxchg: Coding convention for BUILD_BUG()
  csky: Enable ARCH_INLINE_READ*/WRITE*/SPIN*
  csky: Add qspinlock support
  csky: Add jump-label implementation
  csky: Move HEAD_TEXT_SECTION out of __init_begin-end
  csky: Correct position of _stext
  csky: Use the bitmap API to allocate bitmaps
  csky/kprobe: reclaim insn_slot on kprobe unregistration

6 files changed, 105 insertions, 8 deletions

diff --git a/arch/csky/include/asm/Kbuild b/arch/csky/include/asm/Kbuild
index 103207a58f97..1117c28cb7e8 100644
--- a/arch/csky/include/asm/Kbuild
+++ b/arch/csky/include/asm/Kbuild
@@ -3,10 +3,10 @@ generic-y += asm-offsets.h
 generic-y += extable.h
 generic-y += gpio.h
 generic-y += kvm_para.h
-generic-y += spinlock.h
-generic-y += spinlock_types.h
+generic-y += mcs_spinlock.h
 generic-y += qrwlock.h
 generic-y += qrwlock_types.h
+generic-y += qspinlock.h
 generic-y += parport.h
 generic-y += user.h
 generic-y += vmlinux.lds.h
diff --git a/arch/csky/include/asm/cmpxchg.h b/arch/csky/include/asm/cmpxchg.h
index 5b8faccd65e4..916043b845f1 100644
--- a/arch/csky/include/asm/cmpxchg.h
+++ b/arch/csky/include/asm/cmpxchg.h
@@ -4,10 +4,9 @@
 #define __ASM_CSKY_CMPXCHG_H
 
 #ifdef CONFIG_SMP
+#include <linux/bug.h>
 #include <asm/barrier.h>
 
-extern void __bad_xchg(void);
-
 #define __xchg_relaxed(new, ptr, size)				\
 ({								\
 	__typeof__(ptr) __ptr = (ptr);				\
@@ -15,6 +14,26 @@ extern void __bad_xchg(void);
 	__typeof__(*(ptr)) __ret;				\
 	unsigned long tmp;					\
 	switch (size) {						\
+	case 2: {						\
+		u32 ret;					\
+		u32 shif = ((ulong)__ptr & 2) ? 16 : 0;		\
+		u32 mask = 0xffff << shif;			\
+		__ptr = (__typeof__(ptr))((ulong)__ptr & ~2);	\
+		__asm__ __volatile__ (				\
+			"1:	ldex.w %0, (%4)\n"		\
+			"	and    %1, %0, %2\n"		\
+			"	or     %1, %1, %3\n"		\
+			"	stex.w %1, (%4)\n"		\
+			"	bez    %1, 1b\n"		\
+			: "=&r" (ret), "=&r" (tmp)		\
+			: "r" (~mask),				\
+			  "r" ((u32)__new << shif),		\
+			  "r" (__ptr)				\
+			: "memory");				\
+		__ret = (__typeof__(*(ptr)))			\
+			((ret & mask) >> shif);			\
+		break;						\
+	}							\
 	case 4:							\
 		asm volatile (					\
 		"1:	ldex.w		%0, (%3) \n"		\
@@ -26,7 +45,7 @@ extern void __bad_xchg(void);
 			:);					\
 		break;						\
 	default:						\
-		__bad_xchg();					\
+		BUILD_BUG();					\
 	}							\
 	__ret;							\
 })
@@ -56,7 +75,7 @@ extern void __bad_xchg(void);
 			:);					\
 		break;						\
 	default:						\
-		__bad_xchg();					\
+		BUILD_BUG();					\
 	}							\
 	__ret;							\
 })
@@ -87,7 +106,7 @@ extern void __bad_xchg(void);
 			:);					\
 		break;						\
 	default:						\
-		__bad_xchg();					\
+		BUILD_BUG();					\
 	}							\
 	__ret;							\
 })
@@ -119,7 +138,7 @@ extern void __bad_xchg(void);
 			:);					\
 		break;						\
 	default:						\
-		__bad_xchg();					\
+		BUILD_BUG();					\
 	}							\
 	__ret;							\
 })
diff --git a/arch/csky/include/asm/jump_label.h b/arch/csky/include/asm/jump_label.h
new file mode 100644
index 000000000000..d488ba6084bc
--- /dev/null
+++ b/arch/csky/include/asm/jump_label.h
@@ -0,0 +1,47 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#ifndef __ASM_CSKY_JUMP_LABEL_H
+#define __ASM_CSKY_JUMP_LABEL_H
+
+#ifndef __ASSEMBLY__
+
+#include <linux/types.h>
+
+#define JUMP_LABEL_NOP_SIZE 4
+
+static __always_inline bool arch_static_branch(struct static_key *key,
+					       bool branch)
+{
+	asm_volatile_goto(
+		"1:	nop32					\n"
+		"	.pushsection	__jump_table, \"aw\"	\n"
+		"	.align		2			\n"
+		"	.long		1b - ., %l[label] - .	\n"
+		"	.long		%0 - .			\n"
+		"	.popsection				\n"
+		:  :  "i"(&((char *)key)[branch]) :  : label);
+
+	return false;
+label:
+	return true;
+}
+
+static __always_inline bool arch_static_branch_jump(struct static_key *key,
+						    bool branch)
+{
+	asm_volatile_goto(
+		"1:	bsr32		%l[label]		\n"
+		"	.pushsection	__jump_table, \"aw\"	\n"
+		"	.align		2			\n"
+		"	.long		1b - ., %l[label] - .	\n"
+		"	.long		%0 - .			\n"
+		"	.popsection				\n"
+		:  :  "i"(&((char *)key)[branch]) :  : label);
+
+	return false;
+label:
+	return true;
+}
+
+#endif  /* __ASSEMBLY__ */
+#endif	/* __ASM_CSKY_JUMP_LABEL_H */
diff --git a/arch/csky/include/asm/sections.h b/arch/csky/include/asm/sections.h
new file mode 100644
index 000000000000..4192cba8445d
--- /dev/null
+++ b/arch/csky/include/asm/sections.h
@@ -0,0 +1,10 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+
+#ifndef __ASM_SECTIONS_H
+#define __ASM_SECTIONS_H
+
+#include <asm-generic/sections.h>
+
+extern char _start[];
+
+#endif /* __ASM_SECTIONS_H */
diff --git a/arch/csky/include/asm/spinlock.h b/arch/csky/include/asm/spinlock.h
new file mode 100644
index 000000000000..83a2005341f5
--- /dev/null
+++ b/arch/csky/include/asm/spinlock.h
@@ -0,0 +1,12 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+
+#ifndef __ASM_CSKY_SPINLOCK_H
+#define __ASM_CSKY_SPINLOCK_H
+
+#include <asm/qspinlock.h>
+#include <asm/qrwlock.h>
+
+/* See include/linux/spinlock.h */
+#define smp_mb__after_spinlock()	smp_mb()
+
+#endif /* __ASM_CSKY_SPINLOCK_H */
diff --git a/arch/csky/include/asm/spinlock_types.h b/arch/csky/include/asm/spinlock_types.h
new file mode 100644
index 000000000000..75bdf3af80ba
--- /dev/null
+++ b/arch/csky/include/asm/spinlock_types.h
@@ -0,0 +1,9 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+
+#ifndef __ASM_CSKY_SPINLOCK_TYPES_H
+#define __ASM_CSKY_SPINLOCK_TYPES_H
+
+#include <asm-generic/qspinlock_types.h>
+#include <asm-generic/qrwlock_types.h>
+
+#endif /* __ASM_CSKY_SPINLOCK_TYPES_H */