This is a note to let you know that I've just added the patch titled
nds32: flush_dcache_page: use page_mapping_file to avoid races with swapoff
to the 5.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
nds32-flush_dcache_page-use-page_mapping_file-to-avoid-races-with-swapoff.patch
and it can be found in the queue-5.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From a3a8833dffb7e7329c2586b8bfc531adb503f123 Mon Sep 17 00:00:00 2001
From: Mike Rapoport <rppt@xxxxxxxxxxxxx>
Date: Fri, 9 Apr 2021 13:27:23 -0700
Subject: nds32: flush_dcache_page: use page_mapping_file to avoid races with swapoff
From: Mike Rapoport <rppt@xxxxxxxxxxxxx>
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@xxxxxxxxxx
Fixes: cb9f753a3731 ("mm: fix races between swapoff and flush dcache")
Signed-off-by: Mike Rapoport <rppt@xxxxxxxxxxxxx>
Reviewed-by: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
Acked-by: Greentime Hu <green.hu@xxxxxxxxx>
Cc: Huang Ying <ying.huang@xxxxxxxxx>
Cc: Nick Hu <nickhu@xxxxxxxxxxxxx>
Cc: Vincent Chen <deanbo422@xxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
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 {
Patches currently in stable-queue which might be from rppt@xxxxxxxxxxxxx are
queue-5.4/nds32-flush_dcache_page-use-page_mapping_file-to-avoid-races-with-swapoff.patch
