Re: [PATCH] mm/memory-failure: teach kill_accessing_process to accept hugetlb tail page pfn

[Andrew Morton]

On Thu, 18 Dec 2025 23:28:19 -0700 Jane Chu <jane.chu@xxxxxxxxxx> 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.

This conflicts with your "mm/memory-failure: fix missing ->mf_stats
count in hugetlb poison".

Also conflicts a bit with "mm: fixup pfnmap memory failure handling to
use pgoff" but that one isn't cc:stable, so this patch (which *is*
cc:stable) takes priority.

Help?