linux-kernel - Re: [PATCH] nds32: flush_dcache_page: use page_mapping

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Date:   Wed, 31 Mar 2021 15:30:00 +0800
From:   Greentime Hu <green.hu@...il.com>
To:     Matthew Wilcox <willy@...radead.org>
Cc:     Mike Rapoport <rppt@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Huang Ying <ying.huang@...el.com>,
        Mike Rapoport <rppt@...ux.ibm.com>,
        Nick Hu <nickhu@...estech.com>,
        Vincent Chen <deanbo422@...il.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux Memory Management List <linux-mm@...ck.org>
Subject: Re: [PATCH] nds32: flush_dcache_page: use page_mapping_file to avoid
 races with swapoff

Matthew Wilcox <willy@...radead.org> 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@...ux.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 <rppt@...ux.ibm.com>
>
> Reviewed-by: Matthew Wilcox (Oracle) <willy@...radead.org>

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