[PATCH v3 41/41] s390: more efficient smp barriers
From: "Michael S. Tsirkin" <mst@redhat.com>
Date: 2016-01-10 14:22:27
Also in:
linux-arch, linux-arm-kernel, linux-mips, linux-s390, linux-um, linuxppc-dev, lkml, sparclinux
Subsystem:
s390 architecture, the rest · Maintainers:
Heiko Carstens, Vasily Gorbik, Alexander Gordeev, Linus Torvalds
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 <redacted> Signed-off-by: Michael S. Tsirkin <mst@redhat.com> --- arch/s390/include/asm/barrier.h | 3 +++ 1 file changed, 3 insertions(+)
diff --git a/arch/s390/include/asm/barrier.h b/arch/s390/include/asm/barrier.h
index 4d26fa4..5c8db3c 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 */
--
MST