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Date:   Tue, 15 Nov 2022 07:39:00 +0900
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From:   Naoya Horiguchi <naoya.horiguchi@linux.dev>
To:     Greg KH <gregkh@linuxfoundation.org>
Cc:     stable@vger.kernel.org, Yang Shi <shy828301@gmail.com>,
        James Houghton <jthoughton@google.com>,
        Mike Kravetz <mike.kravetz@oracle.com>,
        Muchun Song <songmuchun@bytedance.com>,
        Miaohe Lin <linmiaohe@huawei.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        Naoya Horiguchi <naoya.horiguchi@nec.com>
Subject: Re: hwpoison, shmem: fix data lost issue for 5.15.y
Message-ID: <20221114223900.GA3883066@u2004>
References: <20221114131403.GA3807058@u2004>
 <Y3JotyM0Flj5ijVW@kroah.com>
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On Mon, Nov 14, 2022 at 05:11:35PM +0100, Greg KH wrote:
> On Mon, Nov 14, 2022 at 10:14:03PM +0900, Naoya Horiguchi wrote:
> > Hi,
> > 
> > I'd like to request the follow commits to be backported to 5.15.y.
> > 
> > - dd0f230a0a80 ("mm: hwpoison: refactor refcount check handling")
> > - 4966455d9100 ("mm: hwpoison: handle non-anonymous THP correctly")
> > - a76054266661 ("mm: shmem: don't truncate page if memory failure happens")
> > 
> > These patches fixed a data lost issue by preventing shmem pagecache from
> > being removed by memory error.  These were not tagged for stable originally,
> > but that's revisited recently.
> 
> And have you tested that these all apply properly (and in which order?)

Yes, I've checked that these cleanly apply (without any change) on
5.15.78 in the above order (i.e. dd0f23 is first, 496645 comes next,
then a76054).

> and work correctly?

Yes, I ran related testcases in my test suite, and their status changed
FAIL to PASS with these patches.

Thanks,
Naoya Horiguchi