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

[Greentime Hu]

Matthew Wilcox <willy@xxxxxxxxxxxxx> 於 2021年3月31日 週三 上午2:14寫道：
>
> 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>

Acked-by: Greentiime Hu <green.hu@xxxxxxxxx>