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| author | Will Deacon <will.deacon@arm.com> | 2015-06-04 18:46:37 +0200 |
|---|---|---|
| committer | Will Deacon <will.deacon@arm.com> | 2015-07-27 16:28:53 +0200 |
| commit | 6059a7b6e818023436a9058170a4fea1c670dc98 (patch) | |
| tree | 7449e24549e4ddee931518e6781f630a63b50933 /arch/arm64/include/asm/atomic.h | |
| parent | arm64: atomics: prefetch the destination word for write prior to stxr (diff) | |
| download | linux-6059a7b6e818023436a9058170a4fea1c670dc98.tar.xz linux-6059a7b6e818023436a9058170a4fea1c670dc98.zip | |
arm64: atomics: implement atomic{,64}_cmpxchg using cmpxchg
We don't need duplicate cmpxchg implementations, so use cmpxchg to
implement atomic{,64}_cmpxchg, like we do for xchg already.
Reviewed-by: Steve Capper <steve.capper@arm.com>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Diffstat (limited to 'arch/arm64/include/asm/atomic.h')
| -rw-r--r-- | arch/arm64/include/asm/atomic.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/arm64/include/asm/atomic.h b/arch/arm64/include/asm/atomic.h index 0b26da365f3b..35a67783cfa0 100644 --- a/arch/arm64/include/asm/atomic.h +++ b/arch/arm64/include/asm/atomic.h @@ -56,6 +56,7 @@ #define atomic_read(v) READ_ONCE((v)->counter) #define atomic_set(v, i) (((v)->counter) = (i)) #define atomic_xchg(v, new) xchg(&((v)->counter), (new)) +#define atomic_cmpxchg(v, old, new) cmpxchg(&((v)->counter), (old), (new)) #define atomic_inc(v) atomic_add(1, (v)) #define atomic_dec(v) atomic_sub(1, (v)) @@ -75,6 +76,7 @@ #define atomic64_read atomic_read #define atomic64_set atomic_set #define atomic64_xchg atomic_xchg +#define atomic64_cmpxchg atomic_cmpxchg #define atomic64_inc(v) atomic64_add(1, (v)) #define atomic64_dec(v) atomic64_sub(1, (v)) |