linux-kernel - [PATCH 4/4] cgroup: use parent directly instead of cgroup

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Message-Id: <20211004084928.17622-4-richard.weiyang@gmail.com>
Date:   Mon,  4 Oct 2021 08:49:28 +0000
From:   Wei Yang <richard.weiyang@...il.com>
To:     tj@...nel.org, lizefan.x@...edance.com, hannes@...xchg.org
Cc:     cgroups@...r.kernel.org, linux-kernel@...r.kernel.org,
        Wei Yang <richard.weiyang@...il.com>
Subject: [PATCH 4/4] cgroup: use parent directly instead of cgroup_parent()

During cgroup_create(), we are sure who is our parent.

Let's use parent directly instead of fetch it from cgroup hierarchy.

Signed-off-by: Wei Yang <richard.weiyang@...il.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 457353aeb0ca..694b1c7803c2 100644
--- a/kernel/cgroup/cgroup.c
+++ b/kernel/cgroup/cgroup.c
@@ -5368,7 +5368,7 @@ static struct cgroup *cgroup_create(struct cgroup *parent, const char *name,
 	cgrp->self.serial_nr = css_serial_nr_next++;
 
 	/* allocation complete, commit to creation */
-	list_add_tail_rcu(&cgrp->self.sibling, &cgroup_parent(cgrp)->self.children);
+	list_add_tail_rcu(&cgrp->self.sibling, &parent->self.children);
 	atomic_inc(&root->nr_cgrps);
 	cgroup_get_live(parent);
 
-- 
2.23.0