linux-kernel - [PATCH v2 4/5] mm/hwpoison: disable hwpoison filter during removing

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Message-Id: <20220509105641.491313-5-pizhenwei@bytedance.com>
Date:   Mon,  9 May 2022 18:56:40 +0800
From:   zhenwei pi <pizhenwei@...edance.com>
To:     akpm@...ux-foundation.org, naoya.horiguchi@....com
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        zhenwei pi <pizhenwei@...edance.com>
Subject: [PATCH v2 4/5] mm/hwpoison: disable hwpoison filter during removing

hwpoison filter is enabled by hwpoison-inject module, after removing
this module, hwpoison filter still works. What is worse, user can not
find the debugfs entries to know this.

Disable the hwpoison filter during removing hwpoison-inject module.

Signed-off-by: zhenwei pi <pizhenwei@...edance.com>
---
 mm/hwpoison-inject.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/mm/hwpoison-inject.c b/mm/hwpoison-inject.c
index bb0cea5468cb..5c0cddd81505 100644
--- a/mm/hwpoison-inject.c
+++ b/mm/hwpoison-inject.c
@@ -65,6 +65,7 @@ DEFINE_DEBUGFS_ATTRIBUTE(unpoison_fops, NULL, hwpoison_unpoison, "%lli\n");
 
 static void pfn_inject_exit(void)
 {
+	hwpoison_filter_enable = 0;
 	debugfs_remove_recursive(hwpoison_dir);
 }
 
-- 
2.20.1