1 files changed, 11 insertions, 5 deletions

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index faad98e6d17d..4f71219cc53e 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -1149,17 +1149,23 @@ struct lruvec *mem_cgroup_lru_move_lists(struct zone *zone,
  * Checks whether given mem is same or in the root_mem_cgroup's
  * hierarchy subtree
  */
-static bool mem_cgroup_same_or_subtree(const struct mem_cgroup *root_memcg,
-                struct mem_cgroup *memcg)
+bool __mem_cgroup_same_or_subtree(const struct mem_cgroup *root_memcg,
+                                  struct mem_cgroup *memcg)
 {
-        bool ret;
-
         if (root_memcg == memcg)
                 return true;
         if (!root_memcg->use_hierarchy)
                 return false;
+        return css_is_ancestor(&memcg->css, &root_memcg->css);
+}
+
+static bool mem_cgroup_same_or_subtree(const struct mem_cgroup *root_memcg,
+                                       struct mem_cgroup *memcg)
+{
+        bool ret;
+
         rcu_read_lock();
-        ret = css_is_ancestor(&memcg->css, &root_memcg->css);
+        ret = __mem_cgroup_same_or_subtree(root_memcg, memcg);
         rcu_read_unlock();
         return ret;
 }