[PATCH] use smp_mb/wmb/rmb where possible

Replace a number of memory barriers with smp_ variants.  This means we won't
take the unnecessary hit on UP machines.

Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 1 insertions, 1 deletions

diff --git a/kernel/kthread.c b/kernel/kthread.c
index e377e2244103..f50f174e92da 100644
--- a/kernel/kthread.c
+++ b/kernel/kthread.c
@@ -174,7 +174,7 @@ int kthread_stop(struct task_struct *k)
 
         /* Must init completion *before* thread sees kthread_stop_info.k */
         init_completion(&kthread_stop_info.done);
-        wmb();
+        smp_wmb();
 
         /* Now set kthread_should_stop() to true, and wake it up. */
         kthread_stop_info.k = k;