Commit 0c44ca71 authored May 29, 2012 by Heiko Carstens Committed by Martin Schwidefsky May 30, 2012

s390/cmpxchg: add missing memory barrier to cmpxchg64



All cmpxchg functions imply a memory barrier.
cmpxch64 did not have one for 31 bit code, so add it.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

parent b9e3f776

arch/s390/include/asm/cmpxchg.h

+1 −1

Original line number	Diff line number	Diff line
		@@ -181,7 +181,7 @@ static inline unsigned long long __cmpxchg64(void *ptr,
		" cds %0,%2,%1"
		: "+&d" (rp_old), "=Q" (ptr)
		: "d" (rp_new), "Q" (ptr)
		: "cc");
		: "memory", "cc");
		return rp_old.pair;
		}
		#define cmpxchg64(ptr, o, n) \