[PATCH] nds32: flush_dcache_page: use page_mapping_file to avoid races with swapoff

[Mike Rapoport]

From: Mike Rapoport <r...@linux.ibm.com>

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 <r...@linux.ibm.com>
---
 arch/nds32/mm/cacheflush.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/nds32/mm/cacheflush.c b/arch/nds32/mm/cacheflush.c
index 6eb98a7ad27d..ad5344ef5d33 100644
--- a/arch/nds32/mm/cacheflush.c
+++ b/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 {
-- 
2.28.0