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arm64: cmpxchg: implement cmpxchg64_relaxed

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This patch introduces cmpxchg64_relaxed for arm64 using the existing
cmpxchg_local macro, which performs a cmpxchg operation (up to 64 bits)
without barrier semantics.

Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
(cherry picked from commit cf10b79a7d)
Signed-off-by: Mark Brown <broonie@linaro.org>
This commit is contained in:
Will Deacon
2013-10-09 15:54:28 +01:00
committed by Mark Brown
parent 9f89c68bf6
commit 9e7ced5a24
1 changed files with 2 additions and 0 deletions
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arch/arm64/include/asm/cmpxchg.h
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@@ -173,4 +173,6 @@ 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))
#endif /* __ASM_CMPXCHG_H */