cmpxchg64_relaxed can be used to provide barrier-less semantics for a 64-bit cmpxchg operation in cases where the strong memory ordering is not required.
This patch implements a dummy implementation for asm-generic, falling back to the usual cmpxchg64 code. Cc: Arnd Bergmann <a...@arndb.de> Signed-off-by: Will Deacon <will.dea...@arm.com> --- include/asm-generic/cmpxchg.h | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/include/asm-generic/cmpxchg.h b/include/asm-generic/cmpxchg.h index 811fb1e..298b9d4 100644 --- a/include/asm-generic/cmpxchg.h +++ b/include/asm-generic/cmpxchg.h @@ -102,7 +102,8 @@ unsigned long __xchg(unsigned long x, volatile void *ptr, int size) #define cmpxchg64_local(ptr, o, n) __cmpxchg64_local_generic((ptr), (o), (n)) #endif -#define cmpxchg(ptr, o, n) cmpxchg_local((ptr), (o), (n)) -#define cmpxchg64(ptr, o, n) cmpxchg64_local((ptr), (o), (n)) +#define cmpxchg(ptr, o, n) cmpxchg_local((ptr), (o), (n)) +#define cmpxchg64(ptr, o, n) cmpxchg64_local((ptr), (o), (n)) +#define cmpxchg64_relaxed(ptr, o, n) cmpxchg64((ptr), (o), (n)) #endif /* __ASM_GENERIC_CMPXCHG_H */ -- 1.8.2.2 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
