linux-kernel - [PATCH] cgroup: use cached local variable parent in for loop

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Date:   Sat, 15 Jul 2023 11:08:29 +0800
From:   Miaohe Lin <linmiaohe@...wei.com>
To:     <tj@...nel.org>, <hannes@...xchg.org>, <lizefan.x@...edance.com>
CC:     <cgroups@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linmiaohe@...wei.com>
Subject: [PATCH] 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@...wei.com>
---
 kernel/cgroup/cgroup.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/cgroup/cgroup.c b/kernel/cgroup/cgroup.c
index 6225d5829459..033f38fb5cef 100644
--- 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++;
 		/*
-- 
2.33.0