linux-kernel - [PATCH] cgroup: remove cgrp->kn check in css_populate

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Date:   Mon, 17 Jul 2023 20:09:23 +0530
From:   Kamalesh Babulal <kamalesh.babulal@...cle.com>
To:     Tejun Heo <tj@...nel.org>, Zefan Li <lizefan.x@...edance.com>,
        Johannes Weiner <hannes@...xchg.org>
Cc:     Tom Hromatka <tom.hromatka@...cle.com>, cgroups@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] cgroup: remove cgrp->kn check in css_populate_dir()

cgroup_create() creates cgrp and assigns the kernfs_node to cgrp->kn,
then cgroup_mkdir() populates base and csses cft file by calling
css_populate_dir() and cgroup_apply_control_enable() with a valid
cgrp->kn. Check for NULL cgrp->kn, will always be false, remove it.

Signed-off-by: Kamalesh Babulal <kamalesh.babulal@...cle.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 f55a40db065f..5294fbfb4bf4 100644
--- a/kernel/cgroup/cgroup.c
+++ b/kernel/cgroup/cgroup.c
@@ -1736,7 +1736,7 @@ static int css_populate_dir(struct cgroup_subsys_state *css)
 	struct cftype *cfts, *failed_cfts;
 	int ret;
 
-	if ((css->flags & CSS_VISIBLE) || !cgrp->kn)
+	if (css->flags & CSS_VISIBLE)
 		return 0;
 
 	if (!css->ss) {

base-commit: fdf0eaf11452d72945af31804e2a1048ee1b574c
-- 
2.34.3