[PATCH] mm: memcontrol: fix cgroup creation failure after many small jobs fix

[Johannes Weiner]

init the IDR

Reported-by: Vladimir Davydov <vdavydov@xxxxxxxxxxxxx>
Signed-off-by: Johannes Weiner <hannes@xxxxxxxxxxx>
---
 mm/memcontrol.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index dc92b2df2585..b0de1342eab2 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -4081,7 +4081,7 @@ static struct cftype mem_cgroup_legacy_files[] = {
  * those references are manageable from userspace.
  */
 
-static struct idr mem_cgroup_idr;
+static DEFINE_IDR(mem_cgroup_idr);
 
 static void mem_cgroup_id_get(struct mem_cgroup *memcg)
 {
-- 
2.8.3