+ nds32-flush_dcache_page-use-page_mapping_file-to-avoid-races-with-swapoff.patch added to -mm tree

+ nds32-flush_dcache_page-use-page_mapping_file-to-avoid-races-with-swapoff.patch added to -mm tree

[akpm]

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_mapping_file-to-avoid-races-with-swapoff.patch
and later at
    https://ozlabs.org/~akpm/mmotm/broken-out/nds32-flush_dcache_page-use-page_mapping_file-to-avoid-races-with-swapoff.patch

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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