[Xen-changelog] [xen-unstable] x86: smp_mb__{before, after}_clear_bit() are no-ops.

[Xen patchbot-unstable <patchbot-unstable@xxxxxxxxxxxxxxxxxxx>]

# HG changeset patch
# User Keir Fraser <keir.fraser@xxxxxxxxxx>
# Date 1220535476 -3600
# Node ID 8d982c7a0d303de1200134fcf3a2573f6f4449fa
# Parent  7d1eadfe463178b04e20a4a3e8dc28b87301849b
x86: smp_mb__{before,after}_clear_bit() are no-ops.
Signed-off-by: Keir Fraser <keir.fraser@xxxxxxxxxx>
---
 xen/include/asm-x86/bitops.h |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff -r 7d1eadfe4631 -r 8d982c7a0d30 xen/include/asm-x86/bitops.h
--- a/xen/include/asm-x86/bitops.h      Thu Sep 04 11:55:48 2008 +0100
+++ b/xen/include/asm-x86/bitops.h      Thu Sep 04 14:37:56 2008 +0100
@@ -116,8 +116,8 @@ static inline void __clear_bit(int nr, v
     __clear_bit(nr, addr);                              \
 })
 
-#define smp_mb__before_clear_bit() barrier()
-#define smp_mb__after_clear_bit()  barrier()
+#define smp_mb__before_clear_bit() ((void)0)
+#define smp_mb__after_clear_bit()  ((void)0)
 
 /**
  * __change_bit - Toggle a bit in memory

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