[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/timer.c b/kernel/timer.c
index ecb3d67c0e14..207aa4f0aa10 100644
--- a/kernel/timer.c
+++ b/kernel/timer.c
@@ -1007,7 +1007,7 @@ asmlinkage long sys_getppid(void)
                  * Make sure we read the pid before re-reading the
                  * parent pointer:
                  */
-                rmb();
+                smp_rmb();
                 parent = me->group_leader->real_parent;
                 if (old != parent)
                         continue;