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| author | Michael S. Tsirkin <mst@redhat.com> | 2016-01-10 13:19:38 +0200 |
|---|---|---|
| committer | Michael S. Tsirkin <mst@redhat.com> | 2016-01-12 20:47:05 +0200 |
| commit | 779a6a36961b50cd154da5705d9e6508f819cc4e (patch) | |
| tree | e36f7c676eecb14d47d633a95e3c547d4c3f58c2 /arch/s390 | |
| parent | a677f4869576eb177570ffee68598d2202de030f (diff) | |
| download | linux-779a6a36961b50cd154da5705d9e6508f819cc4e.tar.bz2 | |
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: Peter Zijlstra <peterz@infradead.org>
Suggested-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Acked-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Diffstat (limited to 'arch/s390')
| -rw-r--r-- | arch/s390/include/asm/barrier.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/s390/include/asm/barrier.h b/arch/s390/include/asm/barrier.h index 4d26fa43ec90..5c8db3ce61c8 100644 --- a/arch/s390/include/asm/barrier.h +++ b/arch/s390/include/asm/barrier.h @@ -45,6 +45,9 @@ do { \ ___p1; \ }) +#define __smp_mb__before_atomic() barrier() +#define __smp_mb__after_atomic() barrier() + #include <asm-generic/barrier.h> #endif /* __ASM_BARRIER_H */ |