diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 95d6c25..c0b065e 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -1725,7 +1725,7 @@
 /*
  * Check OOM-Killer is already running under our hierarchy.
  * If someone is running, return false.
- * Has to be called with memcg_oom_mutex
+ * Has to be called with memcg_oom_lock
  */
 static bool mem_cgroup_oom_lock(struct mem_cgroup *mem)
 {
@@ -1770,7 +1770,7 @@
 }
 
 /*
- * Has to be called with memcg_oom_mutex
+ * Has to be called with memcg_oom_lock
  */
 static int mem_cgroup_oom_unlock(struct mem_cgroup *mem)
 {
@@ -1802,7 +1802,7 @@
 		atomic_add_unless(&iter->under_oom, -1, 0);
 }
 
-static DEFINE_MUTEX(memcg_oom_mutex);
+static DEFINE_SPINLOCK(memcg_oom_lock);
 static DECLARE_WAIT_QUEUE_HEAD(memcg_oom_waitq);
 
 struct oom_wait_info {
@@ -1864,7 +1864,7 @@
 	mem_cgroup_mark_under_oom(mem);
 
 	/* At first, try to OOM lock hierarchy under mem.*/
-	mutex_lock(&memcg_oom_mutex);
+	spin_lock(&memcg_oom_lock);
 	locked = mem_cgroup_oom_lock(mem);
 	/*
 	 * Even if signal_pending(), we can't quit charge() loop without
@@ -1876,7 +1876,7 @@
 		need_to_kill = false;
 	if (locked)
 		mem_cgroup_oom_notify(mem);
-	mutex_unlock(&memcg_oom_mutex);
+	spin_unlock(&memcg_oom_lock);
 
 	if (need_to_kill) {
 		finish_wait(&memcg_oom_waitq, &owait.wait);
@@ -1885,11 +1885,11 @@
 		schedule();
 		finish_wait(&memcg_oom_waitq, &owait.wait);
 	}
-	mutex_lock(&memcg_oom_mutex);
+	spin_lock(&memcg_oom_lock);
 	if (locked)
 		mem_cgroup_oom_unlock(mem);
 	memcg_wakeup_oom(mem);
-	mutex_unlock(&memcg_oom_mutex);
+	spin_unlock(&memcg_oom_lock);
 
 	mem_cgroup_unmark_under_oom(mem);
 
@@ -4553,7 +4553,7 @@
 	if (!event)
 		return -ENOMEM;
 
-	mutex_lock(&memcg_oom_mutex);
+	spin_lock(&memcg_oom_lock);
 
 	event->eventfd = eventfd;
 	list_add(&event->list, &memcg->oom_notify);
@@ -4561,7 +4561,7 @@
 	/* already in OOM ? */
 	if (atomic_read(&memcg->under_oom))
 		eventfd_signal(eventfd, 1);
-	mutex_unlock(&memcg_oom_mutex);
+	spin_unlock(&memcg_oom_lock);
 
 	return 0;
 }
@@ -4575,7 +4575,7 @@
 
 	BUG_ON(type != _OOM_TYPE);
 
-	mutex_lock(&memcg_oom_mutex);
+	spin_lock(&memcg_oom_lock);
 
 	list_for_each_entry_safe(ev, tmp, &mem->oom_notify, list) {
 		if (ev->eventfd == eventfd) {
@@ -4584,7 +4584,7 @@
 		}
 	}
 
-	mutex_unlock(&memcg_oom_mutex);
+	spin_unlock(&memcg_oom_lock);
 }
 
 static int mem_cgroup_oom_control_read(struct cgroup *cgrp,