Commit 779a6a36 authored by Michael S. Tsirkin's avatar Michael S. Tsirkin

s390: more efficient smp barriers

As per: lkml.kernel.org/r/20150921112252.3c2937e1@mschwide
atomics imply a barrier on s390, so s390 should change
smp_mb__before_atomic and smp_mb__after_atomic to barrier() instead of
smp_mb() and hence should not use the generic versions.
Suggested-by: default avatarPeter Zijlstra <peterz@infradead.org>
Suggested-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: default avatarMichael S. Tsirkin <mst@redhat.com>
Acked-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
Acked-by: default avatarPeter Zijlstra (Intel) <peterz@infradead.org>
parent a677f486
...@@ -45,6 +45,9 @@ do { \ ...@@ -45,6 +45,9 @@ do { \
___p1; \ ___p1; \
}) })
#define __smp_mb__before_atomic() barrier()
#define __smp_mb__after_atomic() barrier()
#include <asm-generic/barrier.h> #include <asm-generic/barrier.h>
#endif /* __ASM_BARRIER_H */ #endif /* __ASM_BARRIER_H */
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