From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 7EB8B34DCC7 for ; Tue, 30 Jun 2026 20:50:14 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1782852615; cv=none; b=lwdn43ZC3WrUKmllzgLWvwW9EIcZ5tsq/SmAz3bG+mcXEb2DhBlUX89aBn2hb+cbvCwa2L4GEtsLLGNALFaDzjURX3bB3udYCBGKSUNVwJIOimotbr4Erh/akjfEE1iJl8fZsxgzKTaZ2QcND6QbIeeKyVlf9SVSootus8wudp8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1782852615; c=relaxed/simple; bh=391yj7zibjz37ndqdCWd8e4g02MA6ZqGrNBARH+7MHk=; h=Date:To:From:Subject:Message-Id; b=cRDgKnJTH4pKi8Aei8dqfFS7mnmJ6d9VFTDN6GdJlQmcPe6HPs3fBM+X1tzF855YdwB59mHfiJhuz8io3g1sasgj3MgUOjuM5cC+5bqlFw8y3NHexcWe2gejquILeX8aXKk49KiiTc1ITmdA8/F02sEzg3lvsounn+oFEjWaMHo= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b=JoE4Y1JS; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b="JoE4Y1JS" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 2FB181F000E9; Tue, 30 Jun 2026 20:50:14 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux-foundation.org; s=korg; t=1782852614; bh=2Q6rGR7MmYisCymlo9OVzk//XZhDC3LOoNvYBTbFMmA=; h=Date:To:From:Subject; b=JoE4Y1JSJ/v+hl3zrryqk8gDPaVnkoEJr5rokqTjjUpcjp8srzXAaAN2waqdNWTdS FC2vGk7XSc4DLyYmeQZK5UcaRpbsEYDQiyQl0MuijYa/msSbGDe3FtmI0xCXraGY3u YkwVo3HZ/i9gCU7dIeoCO+0n5bE9Aodl1DshDxDc= Date: Tue, 30 Jun 2026 13:50:13 -0700 To: mm-commits@vger.kernel.org,leitao@debian.org,akpm@linux-foundation.org From: Andrew Morton Subject: [to-be-updated] mm-memory-failure-report-mf_msg_kernel-for-unrecoverable-kernel-pages.patch removed from -mm tree Message-Id: <20260630205014.2FB181F000E9@smtp.kernel.org> Precedence: bulk X-Mailing-List: mm-commits@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: The quilt patch titled Subject: mm/memory-failure: report MF_MSG_KERNEL for unrecoverable kernel pages has been removed from the -mm tree. Its filename was mm-memory-failure-report-mf_msg_kernel-for-unrecoverable-kernel-pages.patch This patch was dropped because an updated version will be issued ------------------------------------------------------ From: Breno Leitao Subject: mm/memory-failure: report MF_MSG_KERNEL for unrecoverable kernel pages Date: Fri, 26 Jun 2026 08:33:17 -0700 The previous patch teaches get_any_page() to return -ENOTRECOVERABLE for stable unhandlable kernel pages (PG_reserved, slab, page tables, large-kmalloc). memory_failure() still folds every negative return into MF_MSG_GET_HWPOISON, so callers that want to react to the unrecoverable cases (a panic option, smarter logging) cannot tell them apart from transient page-allocator races. Turn the post-call branch into a switch over the get_hwpoison_page() return code: map -ENOTRECOVERABLE to MF_MSG_KERNEL and any other negative return to MF_MSG_GET_HWPOISON. case 0 keeps the existing free-buddy / kernel-high-order handling and case 1 falls through to the rest of memory_failure() unchanged. The MF_MSG_KERNEL label and tracepoint string are kept as "reserved kernel page" to avoid breaking userspace tools that match on those literals; the enum value still adequately tags the failure even though it now also covers slab, page tables and large-kmalloc pages. Link: https://lore.kernel.org/20260626-ecc_panic-v10-3-6dacb8ad024d@debian.org Signed-off-by: Breno Leitao Suggested-by: David Hildenbrand Acked-by: David Hildenbrand (Arm) Acked-by: Miaohe Lin Cc: Jonathan Corbet Cc: Lance Yang Cc: Liam R. Howlett Cc: Lorenzo Stoakes Cc: "Masami Hiramatsu (Google)" Cc: Mathieu Desnoyers Cc: Michal Hocko Cc: Mike Rapoport Cc: Naoya Horiguchi Cc: Shuah Khan Cc: Steven Rostedt Cc: Suren Baghdasaryan Cc: Vlastimil Babka Signed-off-by: Andrew Morton --- mm/memory-failure.c | 17 +++++++++++++++-- 1 file changed, 15 insertions(+), 2 deletions(-) --- a/mm/memory-failure.c~mm-memory-failure-report-mf_msg_kernel-for-unrecoverable-kernel-pages +++ a/mm/memory-failure.c @@ -2434,7 +2434,8 @@ try_again: * that may make page_ref_freeze()/page_ref_unfreeze() mismatch. */ res = get_hwpoison_page(p, flags); - if (!res) { + switch (res) { + case 0: if (is_free_buddy_page(p)) { if (take_page_off_buddy(p)) { page_ref_inc(p); @@ -2453,7 +2454,19 @@ try_again: res = action_result(pfn, MF_MSG_KERNEL_HIGH_ORDER, MF_IGNORED); } goto unlock_mutex; - } else if (res < 0) { + case 1: + /* Got a refcount on a handlable page. */ + break; + case -ENOTRECOVERABLE: + /* + * Stable unhandlable kernel-owned page (PG_reserved, + * slab, page tables, large-kmalloc). + * No recovery possible. + */ + res = action_result(pfn, MF_MSG_KERNEL, MF_IGNORED); + goto unlock_mutex; + default: + /* Transient lifecycle race with the page allocator. */ res = action_result(pfn, MF_MSG_GET_HWPOISON, MF_IGNORED); goto unlock_mutex; } _ Patches currently in -mm which might be from leitao@debian.org are mm-kmemleak-avoid-soft-lockup-when-scanning-task-stacks.patch mm-kmemleak-stop-the-task-stack-scan-early-when-interrupted.patch mm-kmemleak-stop-the-per-cpu-and-struct-page-scans-early-too.patch a.patch mm-memory-failure-add-panic-option-for-unrecoverable-pages.patch documentation-document-panic_on_unrecoverable_memory_failure-sysctl.patch selftests-mm-add-hwpoison-panic-destructive-test.patch mm-kmemleak-skip-the-remaining-scan-phases-when-interrupted.patch