From: Roman Gushchin <guro@fb.com>
Date: Wed, 2 Aug 2017 16:55:32 +0000 (+0100)
Subject: cgroup: re-use the parent pointer in cgroup_destroy_locked()
X-Git-Tag: v4.14-rc1~123^2~5
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=5a621e6c958e057c727a30c502f28bf2bc04adfd;p=thirdparty%2Flinux.git

cgroup: re-use the parent pointer in cgroup_destroy_locked()

As we already have a pointer to the parent cgroup in
cgroup_destroy_locked(), we don't need to calculate it again
to pass as an argument for cgroup1_check_for_release().

Signed-off-by: Roman Gushchin <guro@fb.com>
Suggested-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Zefan Li <lizefan@huawei.com>
Cc: Waiman Long <longman@redhat.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: kernel-team@fb.com
Cc: linux-kernel@vger.kernel.org
---

diff --git a/kernel/cgroup/cgroup.c b/kernel/cgroup/cgroup.c
index a06755a610e13..92e5997962208 100644
--- a/kernel/cgroup/cgroup.c
+++ b/kernel/cgroup/cgroup.c
@@ -5022,7 +5022,7 @@ static int cgroup_destroy_locked(struct cgroup *cgrp)
 		tcgrp->nr_dying_descendants++;
 	}
 
-	cgroup1_check_for_release(cgroup_parent(cgrp));
+	cgroup1_check_for_release(parent);
 
 	/* put the base reference */
 	percpu_ref_kill(&cgrp->self.refcnt);