memcg: fix hierarchical oom locking

[profile/ivi/kernel-x86-ivi.git] / mm / memcontrol.c

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 0e40f02..ebd1e86 100644 (file)
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -1841,29 +1841,23 @@ static int mem_cgroup_hierarchical_reclaim(struct mem_cgroup *root_mem,
  */
 static bool mem_cgroup_oom_lock(struct mem_cgroup *mem)
 {
-       int lock_count = -1;
        struct mem_cgroup *iter, *failed = NULL;
        bool cond = true;
 
        for_each_mem_cgroup_tree_cond(iter, mem, cond) {
-               bool locked = iter->oom_lock;
-
-               iter->oom_lock = true;
-               if (lock_count == -1)
-                       lock_count = iter->oom_lock;
-               else if (lock_count != locked) {
+               if (iter->oom_lock) {
                        /*
                         * this subtree of our hierarchy is already locked
                         * so we cannot give a lock.
                         */
-                       lock_count = 0;
                        failed = iter;
                        cond = false;
-               }
+               } else
+                       iter->oom_lock = true;
        }
 
        if (!failed)
-               goto done;
+               return true;
 
        /*
         * OK, we failed to lock the whole subtree so we have to clean up
@@ -1877,8 +1871,7 @@ static bool mem_cgroup_oom_lock(struct mem_cgroup *mem)
                }
                iter->oom_lock = false;
        }
-done:
-       return lock_count;
+       return false;
 }
 
 /*