linux-kernel - [PATCH v3 1/2] mm/memory-failure.c: avoid calling invalidate_inode

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Date:   Fri, 18 Mar 2022 15:39:44 +0800
From:   Miaohe Lin <linmiaohe@...wei.com>
To:     <akpm@...ux-foundation.org>, <naoya.horiguchi@....com>,
        <shy828301@...il.com>, <mike.kravetz@...cle.com>
CC:     <linux-mm@...ck.org>, <linux-kernel@...r.kernel.org>,
        <linmiaohe@...wei.com>
Subject: [PATCH v3 1/2] mm/memory-failure.c: avoid calling invalidate_inode_page() with unexpected pages

invalidate_inode_page() can invalidate the pages in the swap cache because
the check of page->mapping != mapping is removed via Matthew's patch titled
"mm/truncate: Inline invalidate_complete_page() into its one caller". But
invalidate_inode_page() is not expected to deal with the pages in the swap
cache. Also non-lru movable page can reach here too. They're not page cache
pages. Skip these pages by checking PageSwapCache and PageLRU to fix this
unexpected issue.

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 5444a8ef4867..ecf45961f3b6 100644
--- a/mm/memory-failure.c
+++ b/mm/memory-failure.c
@@ -2178,7 +2178,7 @@ static int __soft_offline_page(struct page *page)
 		return 0;
 	}

-	if (!PageHuge(page))
+	if (!PageHuge(page) && PageLRU(page) && !PageSwapCache(page))
 		/*
 		 * Try to invalidate first. This should work for
 		 * non dirty unmapped page cache pages.
-- 
2.23.0