linux-kernel - Re: [PATCH v7 2/2] mm/memory-failure: teach kill_accessing

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Message-ID: <aXjAhpkzifB51MV2@hyeyoo>
Date: Tue, 27 Jan 2026 22:41:26 +0900
From: Harry Yoo <harry.yoo@...cle.com>
To: Jane Chu <jane.chu@...cle.com>
Cc: linux-kernel@...r.kernel.org, linux-mm@...ck.org, stable@...r.kernel.org,
        muchun.song@...ux.dev, osalvador@...e.de, david@...nel.org,
        linmiaohe@...wei.com, jiaqiyan@...gle.com, william.roche@...cle.com,
        rientjes@...gle.com, akpm@...ux-foundation.org,
        lorenzo.stoakes@...cle.com, Liam.Howlett@...cle.com, rppt@...nel.org,
        surenb@...gle.com, mhocko@...e.com, willy@...radead.org, clm@...a.com
Subject: Re: [PATCH v7 2/2] mm/memory-failure: teach kill_accessing_process
 to accept hugetlb tail page pfn

On Tue, Jan 20, 2026 at 04:22:34PM -0700, Jane Chu wrote:
> When a hugetlb folio is being poisoned again, try_memory_failure_hugetlb()
> passed head pfn to kill_accessing_process(), that is not right.
> The precise pfn of the poisoned page should be used in order to
> determine the precise vaddr as the SIGBUS payload.
> 
> This issue has already been taken care of in the normal path, that is,
> hwpoison_user_mappings(), see [1][2].  Further more, for [3] to work
> correctly in the hugetlb repoisoning case, it's essential to inform
> VM the precise poisoned page, not the head page.
> 
> [1] https://lkml.kernel.org/r/20231218135837.3310403-1-willy@infradead.org
> [2] https://lkml.kernel.org/r/20250224211445.2663312-1-jane.chu@oracle.com
> [3] https://lore.kernel.org/lkml/20251116013223.1557158-1-jiaqiyan@google.com/
> 
> Cc: <stable@...r.kernel.org>
> Signed-off-by: Jane Chu <jane.chu@...cle.com>
> Reviewed-by: Liam R. Howlett <Liam.Howlett@...cle.com>
> Acked-by: Miaohe Lin <linmiaohe@...wei.com>
> ---

FWIW, looks good to me,
Reviewed-by: Harry Yoo <harry.yoo@...cle.com>

-- 
Cheers,
Harry / Hyeonggon