linux-kernel - Re: [PATCH v2] mm/migrate: fix shmem xarray update during migration

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Message-ID: <2025030437-posting-barbecue-94af@gregkh>
Date: Tue, 4 Mar 2025 06:30:46 +0100
From: Greg KH <gregkh@...uxfoundation.org>
To: Zi Yan <ziy@...dia.com>
Cc: Liu Shixin <liushixin2@...wei.com>,
	Baolin Wang <baolin.wang@...ux.alibaba.com>, linux-mm@...ck.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Barry Song <baohua@...nel.org>,
	David Hildenbrand <david@...hat.com>,
	Kefeng Wang <wangkefeng.wang@...wei.com>,
	Lance Yang <ioworker0@...il.com>,
	Ryan Roberts <ryan.roberts@....com>,
	Matthew Wilcox <willy@...radead.org>,
	Hugh Dickins <hughd@...gle.com>,
	Charan Teja Kalla <quic_charante@...cinc.com>,
	linux-kernel@...r.kernel.org, Shivank Garg <shivankg@....com>,
	stable@...r.kernel.org
Subject: Re: [PATCH v2] mm/migrate: fix shmem xarray update during migration

On Mon, Mar 03, 2025 at 09:03:04PM -0500, Zi Yan wrote:
> On 28 Feb 2025, at 12:49, Zi Yan wrote:
> 
> > Pagecache uses multi-index entries for large folio, so does shmem. Only
> > swap cache still stores multiple entries for a single large folio.
> > Commit fc346d0a70a1 ("mm: migrate high-order folios in swap cache correctly")
> > fixed swap cache but got shmem wrong by storing multiple entries for
> > a large shmem folio. Fix it by storing a single entry for a shmem
> > folio.
> >
> > Fixes: fc346d0a70a1 ("mm: migrate high-order folios in swap cache correctly")
> > Reported-by: Liu Shixin <liushixin2@...wei.com>
> > Closes: https://lore.kernel.org/all/28546fb4-5210-bf75-16d6-43e1f8646080@huawei.com/
> > Signed-off-by: Zi Yan <ziy@...dia.com>
> > Reviewed-by: Shivank Garg <shivankg@....com>
> 
> +Cc:stable
> 

<formletter>

This is not the correct way to submit patches for inclusion in the
stable kernel tree.  Please read:
    https://www.kernel.org/doc/html/latest/process/stable-kernel-rules.html
for how to do this properly.

</formletter>