From: Mike Rapoport rppt@linux.ibm.com 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@kernel.org Fixes: cb9f753a3731 ("mm: fix races between swapoff and flush dcache") Signed-off-by: Mike Rapoport rppt@linux.ibm.com Reviewed-by: Matthew Wilcox (Oracle) willy@infradead.org Acked-by: Greentime Hu green.hu@gmail.com Cc: Huang Ying ying.huang@intel.com Cc: Nick Hu nickhu@andestech.com Cc: Vincent Chen deanbo422@gmail.com Cc: stable@vger.kernel.org Signed-off-by: Andrew Morton akpm@linux-foundation.org ---

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 { _