diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index 25c7eb52de1a1f62dfd0354e8e98060717a9df3f..d5160a83fb35f6f4c25968fda7b6826b50867203 100644
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -326,12 +326,6 @@ static struct hlist_head *css_set_hash(struct cgroup_subsys_state *css[])
 	return &css_set_table[index];
 }
 
-static void free_css_set_rcu(struct rcu_head *obj)
-{
-	struct css_set *cg = container_of(obj, struct css_set, rcu_head);
-	kfree(cg);
-}
-
 /* We don't maintain the lists running through each css_set to its
  * task until after the first call to cgroup_iter_start(). This
  * reduces the fork()/exit() overhead for people who have cgroups
@@ -375,7 +369,7 @@ static void __put_css_set(struct css_set *cg, int taskexit)
 	}
 
 	write_unlock(&css_set_lock);
-	call_rcu(&cg->rcu_head, free_css_set_rcu);
+	kfree_rcu(cg, rcu_head);
 }
 
 /*