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

[Matthew Wilcox]

On Tue, Mar 30, 2021 at 08:51:26PM +0300, Mike Rapoport wrote:
> From: Mike Rapoport <rppt@xxxxxxxxxxxxx>
> 
> 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 <rppt@xxxxxxxxxxxxx>

Reviewed-by: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>