linux-kernel - [PATCH] drivers/base/node.c: fix compaction sysfs file leak

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Date:   Fri, 1 Apr 2022 15:09:05 +0800
From:   Miaohe Lin <linmiaohe@...wei.com>
To:     <gregkh@...uxfoundation.org>
CC:     <rafael@...nel.org>, <mel@....ul.ie>, <akpm@...ux-foundation.org>,
        <minchan.kim@...il.com>, <kamezawa.hiroyu@...fujitsu.com>,
        <kosaki.motohiro@...fujitsu.com>, <linux-kernel@...r.kernel.org>,
        <linmiaohe@...wei.com>
Subject: [PATCH] drivers/base/node.c: fix compaction sysfs file leak

Compaction sysfs file is created via compaction_register_node in
register_node. But we forgot to remove it in unregister_node. Thus
compaction sysfs file is leaked. Using compaction_unregister_node
to fix this issue.

Fixes: ed4a6d7f0676 ("mm: compaction: add /sys trigger for per-node memory compaction")
Signed-off-by: Miaohe Lin <linmiaohe@...wei.com>
---
 drivers/base/node.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/base/node.c b/drivers/base/node.c
index ec8bb24a5a22..0ac6376ef7a1 100644
--- a/drivers/base/node.c
+++ b/drivers/base/node.c
@@ -682,6 +682,7 @@ static int register_node(struct node *node, int num)
  */
 void unregister_node(struct node *node)
 {
+	compaction_unregister_node(node);
 	hugetlb_unregister_node(node);		/* no-op, if memoryless node */
 	node_remove_accesses(node);
 	node_remove_caches(node);
-- 
2.23.0