Pull ar-k0-usage into release branch

[karo-tx-linux.git] / mm / vmscan.c

diff --git a/mm/vmscan.c b/mm/vmscan.c
index a740778f688da277d35eb0d15a60168257dbe42e..64f9570cff568103c8031706322c0e78b8f93029 100644 (file)
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -511,10 +511,11 @@ static int shrink_list(struct list_head *page_list, struct scan_control *sc)
                 * PageDirty _after_ making sure that the page is freeable and
                 * not in use by anybody.       (pagecache + us == 2)
                 */
-               if (page_count(page) != 2 || PageDirty(page)) {
-                       write_unlock_irq(&mapping->tree_lock);
-                       goto keep_locked;
-               }
+               if (unlikely(page_count(page) != 2))
+                       goto cannot_free;
+               smp_rmb();
+               if (unlikely(PageDirty(page)))
+                       goto cannot_free;
 
 #ifdef CONFIG_SWAP
                if (PageSwapCache(page)) {
@@ -538,6 +539,10 @@ free_it:
                        __pagevec_release_nonlru(&freed_pvec);
                continue;
 
+cannot_free:
+               write_unlock_irq(&mapping->tree_lock);
+               goto keep_locked;
+
 activate_locked:
                SetPageActive(page);
                pgactivate++;
@@ -1258,9 +1263,9 @@ void wakeup_kswapd(struct zone *zone, int order)
                pgdat->kswapd_max_order = order;
        if (!cpuset_zone_allowed(zone, __GFP_HARDWALL))
                return;
-       if (!waitqueue_active(&zone->zone_pgdat->kswapd_wait))
+       if (!waitqueue_active(&pgdat->kswapd_wait))
                return;
-       wake_up_interruptible(&zone->zone_pgdat->kswapd_wait);
+       wake_up_interruptible(&pgdat->kswapd_wait);
 }
 
 #ifdef CONFIG_PM