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Message-Id: <1380208411-31403-1-git-send-email-will.deacon@arm.com> Date: Thu, 26 Sep 2013 16:13:28 +0100 From: Will Deacon <will.deacon@....com> To: linux-kernel@...r.kernel.org Cc: tony.luck@...el.com, torvalds@...ux-foundation.org, linux-arch@...r.kernel.org, Will Deacon <will.deacon@....com>, Arnd Bergmann <arnd@...db.de> Subject: [RFC PATCH 1/4] asm-generic: cmpxchg: implement dummy cmpxchg64_relaxed operation 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 <arnd@...db.de> Signed-off-by: Will Deacon <will.deacon@....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 majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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