diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index a294b757607..1aff6c3fcbd 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -55,7 +55,6 @@ static int really_do_swap_account __initdata = 1; /* for remember boot option*/
 #define do_swap_account		(0)
 #endif
 
-static DEFINE_MUTEX(memcg_tasklist);	/* can be hold under cgroup_mutex */
 #define SOFTLIMIT_EVENTS_THRESH (1000)
 
 /*
@@ -1481,9 +1480,7 @@ static int __mem_cgroup_try_charge(struct mm_struct *mm,
 
 		if (!nr_retries--) {
 			if (oom) {
-				mutex_lock(&memcg_tasklist);
 				mem_cgroup_out_of_memory(mem_over_limit, gfp_mask);
-				mutex_unlock(&memcg_tasklist);
 				record_last_oom(mem_over_limit);
 			}
 			goto nomem;
@@ -3393,12 +3390,10 @@ static void mem_cgroup_move_task(struct cgroup_subsys *ss,
 				struct task_struct *p,
 				bool threadgroup)
 {
-	mutex_lock(&memcg_tasklist);
 	/*
 	 * FIXME: It's better to move charges of this process from old
 	 * memcg to new memcg. But it's just on TODO-List now.
 	 */
-	mutex_unlock(&memcg_tasklist);
 }
 
 struct cgroup_subsys mem_cgroup_subsys = {