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-rw-r--r--mm/vmscan.c13
1 files changed, 9 insertions, 4 deletions
diff --git a/mm/vmscan.c b/mm/vmscan.c
index 0ea71e8..64f9570 100644
--- 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++;
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