linux-kernel - [PATCH 1/3] mm/memory-failure.c: avoid false-postive PageSwapCache test

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Date:   Thu, 7 Apr 2022 21:03:50 +0800
From:   Miaohe Lin <linmiaohe@...wei.com>
To:     <akpm@...ux-foundation.org>, <naoya.horiguchi@....com>
CC:     <shy828301@...il.com>, <mike.kravetz@...cle.com>,
        <david@...hat.com>, <linux-mm@...ck.org>,
        <linux-kernel@...r.kernel.org>, <linmiaohe@...wei.com>
Subject: [PATCH 1/3] mm/memory-failure.c: avoid false-postive PageSwapCache test

PageSwapCache is only reliable when PageAnon is true because PG_swapcache
serves as PG_owner_priv_1 which can be used by fs if it's pagecache page.
So we should test PageAnon to distinguish pagecache page from swapcache
page to avoid false-postive PageSwapCache test.

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

diff --git a/mm/memory-failure.c b/mm/memory-failure.c
index ef402b490663..2e97302d62e4 100644
--- a/mm/memory-failure.c
+++ b/mm/memory-failure.c
@@ -2262,7 +2262,7 @@ static int __soft_offline_page(struct page *page)
 		return 0;
 	}
 
-	if (!PageHuge(page) && PageLRU(page) && !PageSwapCache(page))
+	if (!PageHuge(page) && PageLRU(page) && !PageAnon(page))
 		/*
 		 * Try to invalidate first. This should work for
 		 * non dirty unmapped page cache pages.
-- 
2.23.0