[PATCH 1/7] memcg: simplify ida initialization

[Glauber Costa <glommer@parallels.com>]

As suggested by akpm, change the manual initialization of our kmem
index to DEFINE_IDA()

Signed-off-by: Glauber Costa <glommer@parallels.com>
CC: Michal Hocko <mhocko@suse.cz>
CC: Kamezawa Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
CC: Johannes Weiner <hannes@cmpxchg.org>
CC: Andrew Morton <akpm@linux-foundation.org>
---
 mm/memcontrol.c | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 6136fec..c0c6adf 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -569,7 +569,7 @@ static void disarm_sock_keys(struct mem_cgroup *memcg)
  * memcg_limited_groups_array_size.  It will double each time we have to
  * increase it.
  */
-static struct ida kmem_limited_groups;
+static DEFINE_IDA(kmem_limited_groups);
 int memcg_limited_groups_array_size;
 
 /*
@@ -5686,9 +5686,6 @@ static int memcg_init_kmem(struct mem_cgroup *memcg, struct cgroup_subsys *ss)
 	if (ret)
 		return ret;
 
-	if (mem_cgroup_is_root(memcg))
-		ida_init(&kmem_limited_groups);
-
 	return mem_cgroup_sockets_init(memcg, ss);
 };
 
-- 
1.7.11.7

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