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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>
This commit is contained in:
Heiko Carstens 2012-05-29 06:54:32 +02:00 committed by Martin Schwidefsky
parent b9e3f776c8
commit 0c44ca71f5
1 changed files with 1 additions and 1 deletions
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2
arch/s390/include/asm/cmpxchg.h
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@ -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) \