mm/memory-failure: check the mapcount of the precise page

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A process may map only some of the pages in a folio, and might be missed
if it maps the poisoned page but not the head page.  Or it might be
unnecessarily hit if it maps the head page, but not the poisoned page.

Link: https://lkml.kernel.org/r/20231218135837.3310403-3-willy@infradead.org
Fixes: 7af446a841 ("HWPOISON, hugetlb: enable error handling path for hugepage")
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

...

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Matthew Wilcox (Oracle) 2023-12-18 13:58:36 +00:00 • committed by Andrew Morton

parent 376907f3a0

commit c79c5a0a00

1 changed files with 3 additions and 3 deletions

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mm/memory-failure.c

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