linux-kernel - [PATCH 3/8] mm: memory-failure: Don't account hwpoison

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Message-ID: <20230708085744.3599311-4-linmiaohe@huawei.com>
Date:   Sat, 8 Jul 2023 16:57:39 +0800
From:   Miaohe Lin <linmiaohe@...wei.com>
To:     <akpm@...ux-foundation.org>, <naoya.horiguchi@....com>
CC:     <linux-mm@...ck.org>, <linux-kernel@...r.kernel.org>,
        <linmiaohe@...wei.com>
Subject: [PATCH 3/8] mm: memory-failure: Don't account hwpoison_filter() filtered pages

mf_generic_kill_procs() will return -EOPNOTSUPP when hwpoison_filter()
filtered dax page. In that case, action_result() isn't expected to be
called to update mf_stats. This will results in inaccurate but benign
memory failure handling statistics.

Signed-off-by: Miaohe Lin <linmiaohe@...wei.com>
---
 mm/memory-failure.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/mm/memory-failure.c b/mm/memory-failure.c
index c155122e3c66..905758af70f3 100644
--- a/mm/memory-failure.c
+++ b/mm/memory-failure.c
@@ -2101,7 +2101,8 @@ static int memory_failure_dev_pagemap(unsigned long pfn, int flags,
 out:
 	/* drop pgmap ref acquired in caller */
 	put_dev_pagemap(pgmap);
-	action_result(pfn, MF_MSG_DAX, rc ? MF_FAILED : MF_RECOVERED);
+	if (rc != -EOPNOTSUPP)
+		action_result(pfn, MF_MSG_DAX, rc ? MF_FAILED : MF_RECOVERED);
 	return rc;
 }
 
-- 
2.33.0