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authorPeter Zijlstra <peterz@infradead.org>2014-03-13 19:00:35 +0100
committerIngo Molnar <mingo@kernel.org>2014-04-18 14:20:47 +0200
commit09a01c0ccb1837abb28afcfdd668fa0dfabed928 (patch)
tree7ef2ffee4fbfe1b07f88d660b46dad4fef80a05e /arch/xtensa/include/asm/atomic.h
parentarch,x86: Convert smp_mb__*() (diff)
downloadlinux-dev-09a01c0ccb1837abb28afcfdd668fa0dfabed928.tar.xz
linux-dev-09a01c0ccb1837abb28afcfdd668fa0dfabed928.zip
arch,xtensa: Convert smp_mb__*()
Xtensa SMP has compare-and-swap which is fully serializing, therefore its exising smp_mb__{before,after}_clear_bit() appear unduly heavy. Implement the new barriers as barrier(). Signed-off-by: Peter Zijlstra <peterz@infradead.org> Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Link: http://lkml.kernel.org/n/tip-e9rqjxr1m1ejsob9p433kmji@git.kernel.org Cc: Chris Zankel <chris@zankel.net> Cc: Geert Uytterhoeven <geert@linux-m68k.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca> Cc: Max Filippov <jcmvbkbc@gmail.com> Cc: linux-kernel@vger.kernel.org Cc: linux-xtensa@linux-xtensa.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/xtensa/include/asm/atomic.h')
-rw-r--r--arch/xtensa/include/asm/atomic.h7
1 files changed, 1 insertions, 6 deletions
diff --git a/arch/xtensa/include/asm/atomic.h b/arch/xtensa/include/asm/atomic.h
index e7fb447bce8e..e5103b47a8ce 100644
--- a/arch/xtensa/include/asm/atomic.h
+++ b/arch/xtensa/include/asm/atomic.h
@@ -19,6 +19,7 @@
#ifdef __KERNEL__
#include <asm/processor.h>
#include <asm/cmpxchg.h>
+#include <asm/barrier.h>
#define ATOMIC_INIT(i) { (i) }
@@ -387,12 +388,6 @@ static inline void atomic_set_mask(unsigned int mask, atomic_t *v)
#endif
}
-/* Atomic operations are already serializing */
-#define smp_mb__before_atomic_dec() barrier()
-#define smp_mb__after_atomic_dec() barrier()
-#define smp_mb__before_atomic_inc() barrier()
-#define smp_mb__after_atomic_inc() barrier()
-
#endif /* __KERNEL__ */
#endif /* _XTENSA_ATOMIC_H */