cgroup: use cached local variable parent in for loop

Use local variable parent to initialize iter tcgrp in for loop so the size
of cgroup.o can be reduced by 64 bytes. No functional change intended.

Signed-off-by: Miaohe Lin <linmiaohe@huawei.com>
Signed-off-by: Tejun Heo <tj@kernel.org>

diff --git a/kernel/cgroup/cgroup.c b/kernel/cgroup/cgroup.c
index 30c9c2503ccf1bdebbd6110a6e9a636a20204ae8..e9a62de3faf9b2adf8e1cd961853c9a906da12c7 100644 (file)
--- a/kernel/cgroup/cgroup.c
+++ b/kernel/cgroup/cgroup.c
@@ -5894,7 +5894,7 @@ static int cgroup_destroy_locked(struct cgroup *cgrp)
                parent->nr_threaded_children--;
 
        spin_lock_irq(&css_set_lock);
-       for (tcgrp = cgroup_parent(cgrp); tcgrp; tcgrp = cgroup_parent(tcgrp)) {
+       for (tcgrp = parent; tcgrp; tcgrp = cgroup_parent(tcgrp)) {
                tcgrp->nr_descendants--;
                tcgrp->nr_dying_descendants++;
                /*