Commit 779a6a36 authored Jan 10, 2016 by 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: 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>

parent a677f486

arch/s390/include/asm/barrier.h

+3 −0

Original line number	Diff line number	Diff line
		@@ -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 */