Re: [PATCH 2/3] mm/memory-failure: Check the mapcount of the precise page

On Mon, Dec 18, 2023 at 01:58:36PM +0000, Matthew Wilcox (Oracle) wrote:

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.

Fixes: 7af446a841a2 ("HWPOISON, hugetlb: enable error handling path for hugepage") Cc: stable@vger.kernel.org Signed-off-by: Matthew Wilcox (Oracle) willy@infradead.org

Acked-by: Naoya Horiguchi naoya.horiguchi@nec.com