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 <[email protected]> Signed-off-by: Martin Schwidefsky <[email protected]>
chrispat · May 30, 2012 · 0c44ca7 · 0c44ca7
1 parent b9e3f77
commit 0c44ca7
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/arch/s390/include/asm/cmpxchg.h b/arch/s390/include/asm/cmpxchg.h
@@ -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)						\