[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, 2 insertions, 2 deletions

diff --git a/mm/mempool.c b/mm/mempool.c
index e9a0a6337b21..c9f3d4620428 100644
--- a/mm/mempool.c
+++ b/mm/mempool.c
@@ -229,7 +229,7 @@ repeat_alloc:
         /* Now start performing page reclaim */
         gfp_temp = gfp_mask;
         prepare_to_wait(&pool->wait, &wait, TASK_UNINTERRUPTIBLE);
-        mb();
+        smp_mb();
         if (!pool->curr_nr)
                 io_schedule();
         finish_wait(&pool->wait, &wait);
@@ -250,7 +250,7 @@ void mempool_free(void *element, mempool_t *pool)
 {
         unsigned long flags;
 
-        mb();
+        smp_mb();
         if (pool->curr_nr < pool->min_nr) {
                 spin_lock_irqsave(&pool->lock, flags);
                 if (pool->curr_nr < pool->min_nr) {