diff --git a/[refs] b/[refs]
index 6f6a526aadcf..8772330770f9 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 3918b96e03b2b8dd05889320623f6870e81d35ec
+refs/heads/master: 3c776e64660028236313f0e54f3a9945764422df
diff --git a/trunk/mm/memcontrol.c b/trunk/mm/memcontrol.c
index 7bb14fdc780c..81b0ae8183d0 100644
--- a/trunk/mm/memcontrol.c
+++ b/trunk/mm/memcontrol.c
@@ -994,13 +994,24 @@ static int __mem_cgroup_try_charge(struct mm_struct *mm,
 static struct mem_cgroup *try_get_mem_cgroup_from_swapcache(struct page *page)
 {
 	struct mem_cgroup *mem;
+	struct page_cgroup *pc;
 	swp_entry_t ent;
 
+	VM_BUG_ON(!PageLocked(page));
+
 	if (!PageSwapCache(page))
 		return NULL;
 
-	ent.val = page_private(page);
-	mem = lookup_swap_cgroup(ent);
+	pc = lookup_page_cgroup(page);
+	/*
+	 * Used bit of swapcache is solid under page lock.
+	 */
+	if (PageCgroupUsed(pc))
+		mem = pc->mem_cgroup;
+	else {
+		ent.val = page_private(page);
+		mem = lookup_swap_cgroup(ent);
+	}
 	if (!mem)
 		return NULL;
 	if (!css_tryget(&mem->css))