memcg: remove unused mem_cgroup->oom_wakeups

Since commit 4942642080ea ("mm: memcg: handle non-error OOM situations
more gracefully"), nobody uses mem_cgroup->oom_wakeups.  Remove it.

While at it, also fold memcg_wakeup_oom() into memcg_oom_recover() which
is its only user.  This cleanup was suggested by Michal.

Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Michal Hocko <mhocko@suse.cz>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 1 insertions, 9 deletions

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 8da44a083397..6a5f5d59f7d7 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -287,7 +287,6 @@ struct mem_cgroup {
 
         bool            oom_lock;
         atomic_t        under_oom;
-        atomic_t        oom_wakeups;
 
         int     swappiness;
         /* OOM-Killer disable */
@@ -1850,17 +1849,10 @@ static int memcg_oom_wake_function(wait_queue_t *wait,
         return autoremove_wake_function(wait, mode, sync, arg);
 }
 
-static void memcg_wakeup_oom(struct mem_cgroup *memcg)
-{
-        atomic_inc(&memcg->oom_wakeups);
-        /* for filtering, pass "memcg" as argument. */
-        __wake_up(&memcg_oom_waitq, TASK_NORMAL, 0, memcg);
-}
-
 static void memcg_oom_recover(struct mem_cgroup *memcg)
 {
         if (memcg && atomic_read(&memcg->under_oom))
-                memcg_wakeup_oom(memcg);
+                __wake_up(&memcg_oom_waitq, TASK_NORMAL, 0, memcg);
 }
 
 static void mem_cgroup_oom(struct mem_cgroup *memcg, gfp_t mask, int order)