linux-kernel - Re: [v3 PATCH 1/5] mm: hwpoison: remove the unnecessary THP check

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Date:   Wed, 6 Oct 2021 10:56:20 -0700
From:   Yang Shi <shy828301@...il.com>
To:     Naoya Horiguchi <naoya.horiguchi@...ux.dev>
Cc:     HORIGUCHI NAOYA(堀口 直也) 
        <naoya.horiguchi@....com>, Hugh Dickins <hughd@...gle.com>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Matthew Wilcox <willy@...radead.org>,
        Peter Xu <peterx@...hat.com>,
        Oscar Salvador <osalvador@...e.de>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linux MM <linux-mm@...ck.org>,
        Linux FS-devel Mailing List <linux-fsdevel@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [v3 PATCH 1/5] mm: hwpoison: remove the unnecessary THP check

On Tue, Oct 5, 2021 at 9:00 PM Naoya Horiguchi
<naoya.horiguchi@...ux.dev> wrote:
>
> > Any comment on this patch and patch #3? I'd prefer to fix more
> > comments for a new version.
>
> No. Both 1/5 and 3/5 look fine to me. So ...
>
> > On Thu, Sep 30, 2021 at 2:53 PM Yang Shi <shy828301@...il.com> wrote:
> > >
> > > When handling THP hwpoison checked if the THP is in allocation or free
> > > stage since hwpoison may mistreat it as hugetlb page.  After
> > > commit 415c64c1453a ("mm/memory-failure: split thp earlier in memory error
> > > handling") the problem has been fixed, so this check is no longer
> > > needed.  Remove it.  The side effect of the removal is hwpoison may
> > > report unsplit THP instead of unknown error for shmem THP.  It seems not
> > > like a big deal.
> > >
> > > The following patch depends on this, which fixes shmem THP with
> > > hwpoisoned subpage(s) are mapped PMD wrongly.  So this patch needs to be
> > > backported to -stable as well.
> > >
> > > Cc: <stable@...r.kernel.org>
> > > Suggested-by: Naoya Horiguchi <naoya.horiguchi@....com>
> > > Signed-off-by: Yang Shi <shy828301@...il.com>
>
> Acked-by: Naoya Horiguchi <naoya.horiguchi@....com>
>
> Patch 3/5 already has my Signed-off-by, so I think it can be considered
> as acked by me.

Aha, thanks. I will add your ack to patch 3/5 too.

>
> Thanks,
> Naoya Horiguchi