The patch titled Subject: nds32: flush_dcache_page: use page_mapping_file to avoid races with swapoff has been added to the -mm tree. Its filename is nds32-flush_dcache_page-use-page_mapping_file-to-avoid-races-with-swapoff.patch

This patch should soon appear at https://ozlabs.org/~akpm/mmots/broken-out/nds32-flush_dcache_page-use-page_m... and later at https://ozlabs.org/~akpm/mmotm/broken-out/nds32-flush_dcache_page-use-page_m...

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------------------------------------------------------ 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 Cc: 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 { _

Patches currently in -mm which might be from rppt@linux.ibm.com are

nds32-flush_dcache_page-use-page_mapping_file-to-avoid-races-with-swapoff.patch mmap-make-mlock_future_check-global.patch riscv-kconfig-make-direct-map-manipulation-options-depend-on-mmu.patch set_memory-allow-set_direct_map__noflush-for-multiple-pages.patch set_memory-allow-querying-whether-set_direct_map_-is-actually-enabled.patch mm-introduce-memfd_secret-system-call-to-create-secret-memory-areas.patch pm-hibernate-disable-when-there-are-active-secretmem-users.patch arch-mm-wire-up-memfd_secret-system-call-where-relevant.patch secretmem-test-add-basic-selftest-for-memfd_secret2.patch