6.6-stable review patch. If anyone has any objections, please let me know.
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From: Matthew Wilcox (Oracle) willy@infradead.org
commit c79c5a0a00a9457718056b588f312baadf44e471 upstream.
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: 7af446a841a2 ("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 Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- mm/memory-failure.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-)
--- a/mm/memory-failure.c +++ b/mm/memory-failure.c @@ -1571,7 +1571,7 @@ static bool hwpoison_user_mappings(struc * This check implies we don't kill processes if their pages * are in the swap cache early. Those are always late kills. */ - if (!page_mapped(hpage)) + if (!page_mapped(p)) return true;
if (PageSwapCache(p)) { @@ -1622,10 +1622,10 @@ static bool hwpoison_user_mappings(struc try_to_unmap(folio, ttu); }
- unmap_success = !page_mapped(hpage); + unmap_success = !page_mapped(p); if (!unmap_success) pr_err("%#lx: failed to unmap page (mapcount=%d)\n", - pfn, page_mapcount(hpage)); + pfn, page_mapcount(p));
/* * try_to_unmap() might put mlocked page in lru cache, so call