diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 942d9342b63b..db69d938e9ed 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -879,7 +879,7 @@ static void invalidate_reclaim_iterators(struct mem_cgroup *dead_memcg)
 	int nid;
 	int i;
 
-	while ((memcg = parent_mem_cgroup(memcg))) {
+	for (; memcg; memcg = parent_mem_cgroup(memcg)) {
 		for_each_node(nid) {
 			mz = mem_cgroup_nodeinfo(memcg, nid);
 			for (i = 0; i <= DEF_PRIORITY; i++) {