From: Mike Rapoport <rppt@xxxxxxxxxxxxx>
Subject: nds32: flush_dcache_page: use page_mapping_file to avoid races with swapoff
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>
---
arch/nds32/mm/cacheflush.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/arch/nds32/mm/cacheflush.c~nds32-flush_dcache_page-use-page_mapping_file-to-avoid-races-with-swapoff
+++ a/arch/nds32/mm/cacheflush.c
@@ -238,7 +238,7 @@ 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 {
_
