linux-kernel - [PATCH v1 1/2] Revert "cgroup: Fix memory leak caused by missing cgroup_bpf

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Message-Id: <20241018081520.694139-2-chenridong@huaweicloud.com>
Date: Fri, 18 Oct 2024 08:15:19 +0000
From: Chen Ridong <chenridong@...weicloud.com>
To: tj@...nel.org,
	lizefan.x@...edance.com,
	hannes@...xchg.org,
	longman@...hat.com,
	mkoutny@...e.com,
	john.fastabend@...il.com,
	roman.gushchin@...ux.dev,
	quanyang.wang@...driver.com,
	ast@...nel.org
Cc: cgroups@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	bpf@...r.kernel.org,
	chenridong@...wei.com,
	wangweiyang2@...wei.com
Subject: [PATCH v1 1/2] Revert "cgroup: Fix memory leak caused by missing cgroup_bpf_offline"

From: Chen Ridong <chenridong@...wei.com>

This reverts commit 04f8ef5643bcd8bcde25dfdebef998aea480b2ba.

Only cgroup v2 can be attached by cgroup by BPF programs. Revert this
commit and cgroup_bpf_inherit and cgroup_bpf_offline won't be called in
cgroup v1. The memory leak issue will be fixed with next patch.

Fixes: 04f8ef5643bc ("cgroup: Fix memory leak caused by missing cgroup_bpf_offline")
Link: https://lore.kernel.org/cgroups/aka2hk5jsel5zomucpwlxsej6iwnfw4qu5jkrmjhyfhesjlfdw@46zxhg5bdnr7/
Signed-off-by: Chen Ridong <chenridong@...wei.com>
---
 kernel/cgroup/cgroup.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/kernel/cgroup/cgroup.c b/kernel/cgroup/cgroup.c
index 044c7ba1cc48..30444e096027 100644
--- a/kernel/cgroup/cgroup.c
+++ b/kernel/cgroup/cgroup.c
@@ -2314,10 +2314,8 @@ static void cgroup_kill_sb(struct super_block *sb)
 	 * And don't kill the default root.
 	 */
 	if (list_empty(&root->cgrp.self.children) && root != &cgrp_dfl_root &&
-	    !percpu_ref_is_dying(&root->cgrp.self.refcnt)) {
-		cgroup_bpf_offline(&root->cgrp);
+	    !percpu_ref_is_dying(&root->cgrp.self.refcnt))
 		percpu_ref_kill(&root->cgrp.self.refcnt);
-	}
 	cgroup_put(&root->cgrp);
 	kernfs_kill_sb(sb);
 }
-- 
2.34.1