diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index fb62b4335fa94b2e82a51716285f6f173e279853..f0dc076adf05730dc9530d6471cc094a24cf066b 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -2202,7 +2202,7 @@ static void __init enable_swap_cgroup(void)
 }
 #endif
 
-static struct cgroup_subsys_state *
+static struct cgroup_subsys_state * __ref
 mem_cgroup_create(struct cgroup_subsys *ss, struct cgroup *cont)
 {
 	struct mem_cgroup *mem, *parent;