On Tue, Mar 30, 2021 at 08:51:26PM +0300, Mike Rapoport wrote:

From: Mike Rapoport <redacted>

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().

Fixes: cb9f753a3731 ("mm: fix races between swapoff and flush dcache")
Signed-off-by: Mike Rapoport <redacted>

Reviewed-by: Matthew Wilcox (Oracle) <willy@infradead.org>