linux-kernel - [PATCH v2 2/3] mm/memory-failure.c: avoid calling invalidate_inode

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Date:   Sat, 12 Mar 2022 15:46:12 +0800
From:   Miaohe Lin <linmiaohe@...wei.com>
To:     <akpm@...ux-foundation.org>, <tony.luck@...el.com>, <bp@...en8.de>,
        <naoya.horiguchi@....com>
CC:     <mike.kravetz@...cle.com>, <shy828301@...il.com>,
        <linux-mm@...ck.org>, <linux-kernel@...r.kernel.org>,
        <linux-edac@...r.kernel.org>, <linmiaohe@...wei.com>
Subject: [PATCH v2 2/3] mm/memory-failure.c: avoid calling invalidate_inode_page() with unexpected pages

Since commit 042c4f32323b ("mm/truncate: Inline invalidate_complete_page()
into its one caller"), invalidate_inode_page() can invalidate the pages in
the swap cache because the check of page->mapping != mapping is removed.
But invalidate_inode_page() is not expected to deal with the pages in 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.

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 dabecd87ad3f..2ff7dd2078c4 100644
--- a/mm/memory-failure.c
+++ b/mm/memory-failure.c
@@ -2190,7 +2190,7 @@ 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