linux-kernel - [PATCH 4.19 10/66] nds32: flush_dcache_page: use page_mapping

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Message-Id: <20210412083958.469573373@linuxfoundation.org>
Date:   Mon, 12 Apr 2021 10:40:16 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Mike Rapoport <rppt@...ux.ibm.com>,
        "Matthew Wilcox (Oracle)" <willy@...radead.org>,
        Greentime Hu <green.hu@...il.com>,
        Huang Ying <ying.huang@...el.com>,
        Nick Hu <nickhu@...estech.com>,
        Vincent Chen <deanbo422@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>
Subject: [PATCH 4.19 10/66] nds32: flush_dcache_page: use page_mapping_file to avoid races with swapoff

From: Mike Rapoport <rppt@...ux.ibm.com>

commit a3a8833dffb7e7329c2586b8bfc531adb503f123 upstream.

Commit cb9f753a3731 ("mm: fix races between swapoff and flush dcache")
updated flush_dcache_page implementations on several architectures to
use page_mapping_file() in order to avoid races between page_mapping()
and swapoff().

This update missed arch/nds32 and there is a possibility of a race
there.

Replace page_mapping() with page_mapping_file() in nds32 implementation
of flush_dcache_page().

Link: https://lkml.kernel.org/r/20210330175126.26500-1-rppt@kernel.org
Fixes: cb9f753a3731 ("mm: fix races between swapoff and flush dcache")
Signed-off-by: Mike Rapoport <rppt@...ux.ibm.com>
Reviewed-by: Matthew Wilcox (Oracle) <willy@...radead.org>
Acked-by: Greentime Hu <green.hu@...il.com>
Cc: Huang Ying <ying.huang@...el.com>
Cc: Nick Hu <nickhu@...estech.com>
Cc: Vincent Chen <deanbo422@...il.com>
Cc: <stable@...r.kernel.org>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 arch/nds32/mm/cacheflush.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/arch/nds32/mm/cacheflush.c
+++ b/arch/nds32/mm/cacheflush.c
@@ -239,7 +239,7 @@ void flush_dcache_page(struct page *page
 {
 	struct address_space *mapping;
 
-	mapping = page_mapping(page);
+	mapping = page_mapping_file(page);
 	if (mapping && !mapping_mapped(mapping))
 		set_bit(PG_dcache_dirty, &page->flags);
 	else {