[RFC PATCH] ARM: cmpxchg: define __HAVE_ARCH_CMPXCHG for armv6 and later
From: Will Deacon <hidden>
Date: 2012-05-31 01:25:09
Also in:
linux-rt-users, lkml
Hello, On Wed, May 30, 2012 at 08:51:26AM +0100, Yong Zhang wrote:
quoted hunk ↗ jump to hunk
diff --git a/arch/arm/include/asm/cmpxchg.h b/arch/arm/include/asm/cmpxchg.h index 7eb18c1..a91b44e 100644 --- a/arch/arm/include/asm/cmpxchg.h +++ b/arch/arm/include/asm/cmpxchg.h@@ -127,6 +127,8 @@ static inline unsigned long __xchg(unsigned long x, volatile void *ptr, int size #else /* min ARCH >= ARMv6 */ +#define __HAVE_ARCH_CMPXCHG 1 + extern void __bad_cmpxchg(volatile void *ptr, int size);
As long as this only requires 4-byte cmpxchg support then I think this is fine. It looks like that's currently the case, so: Acked-by: Will Deacon <redacted> Will