[PATCH 8/9] arm64: cmpxchg: implement cmpxchg_relaxed
From: Will Deacon <hidden>
Date: 2015-07-07 17:24:24
Also in:
linux-arch
Subsystem:
arm64 port (aarch64 architecture), the rest · Maintainers:
Catalin Marinas, Will Deacon, Linus Torvalds
cmpxchg_relaxed offers an SMP-safe, barrier-less cmpxchg implementation so we can define it in the same way that we implement cmpxchg_local on arm64. Signed-off-by: Will Deacon <redacted> --- arch/arm64/include/asm/cmpxchg.h | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/arch/arm64/include/asm/cmpxchg.h b/arch/arm64/include/asm/cmpxchg.h
index d8c25b7b18fb..317bb7f6f92a 100644
--- a/arch/arm64/include/asm/cmpxchg.h
+++ b/arch/arm64/include/asm/cmpxchg.h@@ -219,7 +219,7 @@ static inline unsigned long __cmpxchg_mb(volatile void *ptr, unsigned long old, __ret; \ }) -#define cmpxchg_local(ptr, o, n) \ +#define cmpxchg_relaxed(ptr, o, n) \ ({ \ __typeof__(*(ptr)) __ret; \ __ret = (__typeof__(*(ptr))) \
@@ -228,6 +228,8 @@ static inline unsigned long __cmpxchg_mb(volatile void *ptr, unsigned long old, __ret; \ }) +#define cmpxchg_local cmpxchg_relaxed + #define cmpxchg_double(ptr1, ptr2, o1, o2, n1, n2) \ ({\ int __ret;\
@@ -274,6 +276,6 @@ static inline unsigned long __cmpxchg_mb(volatile void *ptr, unsigned long old, #define cmpxchg64(ptr,o,n) cmpxchg((ptr),(o),(n)) #define cmpxchg64_local(ptr,o,n) cmpxchg_local((ptr),(o),(n)) -#define cmpxchg64_relaxed(ptr,o,n) cmpxchg_local((ptr),(o),(n)) +#define cmpxchg64_relaxed(ptr,o,n) cmpxchg_relaxed((ptr),(o),(n)) #endif /* __ASM_CMPXCHG_H */
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2.1.4