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