linux-kernel - Re: [stable 5.10 PATCH] mm: hwpoison: remove the unnecessary THP check

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Date:   Wed, 3 Nov 2021 10:46:24 +0100
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Yang Shi <shy828301@...il.com>
Cc:     naoya.horiguchi@....com, hughd@...gle.com,
        kirill.shutemov@...ux.intel.com, willy@...radead.org,
        osalvador@...e.de, peterx@...hat.com, akpm@...ux-foundation.org,
        stable@...r.kernel.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [stable 5.10 PATCH] mm: hwpoison: remove the unnecessary THP
 check

On Mon, Nov 01, 2021 at 12:48:56PM -0700, Yang Shi wrote:
> commit c7cb42e94473aafe553c0f2a3d8ca904599399ed upstream.
> 
> 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 "mm: filemap: check if THP has hwpoisoned subpage
> for PMD page fault" 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.
> 
> Link: https://lkml.kernel.org/r/20211020210755.23964-2-shy828301@gmail.com
> Signed-off-by: Yang Shi <shy828301@...il.com>
> Suggested-by: Naoya Horiguchi <naoya.horiguchi@....com>
> Acked-by: Naoya Horiguchi <naoya.horiguchi@....com>
> Cc: Hugh Dickins <hughd@...gle.com>
> Cc: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
> Cc: Matthew Wilcox <willy@...radead.org>
> Cc: Oscar Salvador <osalvador@...e.de>
> Cc: Peter Xu <peterx@...hat.com>
> Cc: <stable@...r.kernel.org>
> Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
> Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
> ---
> mm-filemap-check-if-thp-has-hwpoisoned-subpage-for-pmd-page-fault.patch
> depends on this one.

Both now queued up, thanks.

greg k-h