From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pg1-f200.google.com (mail-pg1-f200.google.com [209.85.215.200]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id CE6EB3AC0F6 for ; Sun, 23 Aug 2026 19:41:13 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.215.200 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787514075; cv=none; b=Panl/w1EPXfjHzS+36OA41+h0WBaJlnnKp3YnYm5PPnHGBOnEFwNpBFCAwqTFkfpqJ4lH755Xl0taL7IGuIP5MMocsTT8SFb7pCvoOD5xSDXRX+BYSQo8zvKbyYEU4sGQRjr4G1hScCiycrQAAoMvXzTh9hslJiWf7a0kqWgpk0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787514075; c=relaxed/simple; bh=1Aw0ssJRltic2ix3YdWreO66fmQSxPAs2WbrM3C3g7M=; h=Date:Mime-Version:Message-ID:Subject:From:To:Cc:Content-Type; b=jNnmzRRSrqJjb3R4Y3zMlPnhlaHV+iALxgHq9Fjxpzr08yQ8GCvVTPkZZS1IG+434ANI+DiTXIpwnySpXFkb6svyzvY5B5/gTyf6Mt24T/DYk2MhuquG8L20H59TQ6UwXUd76AFZBHPlKutSp74t2bP7Q7aQ+muWVnuKyWevb8c= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=flex--wyihan.bounces.google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=RIOzs3Gb; arc=none smtp.client-ip=209.85.215.200 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=flex--wyihan.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="RIOzs3Gb" Received: by mail-pg1-f200.google.com with SMTP id 41be03b00d2f7-c85798977dcso4754472a12.0 for ; Sun, 23 Aug 2026 12:41:13 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20251104; t=1787514073; x=1788118873; darn=vger.kernel.org; h=content-transfer-encoding:content-type:cc:to:from:subject :message-id:mime-version:date:from:to:cc:subject:date:message-id :reply-to:content-type; bh=1YHDRXuyabVdapSHSXZFO8jE+pTDDymBWhtJlJpEAUs=; b=RIOzs3Gb0SgwsWMu8Z/ZTx0uv/T14eX34PAnrVn+KaF4kPx8AQ/0rrXGzYRY2+v7aG WhXH6e8x16ssbjUSs+MsXGGQ9YxjItsIlXeSWNI07f7iml322Pz1fdpLXCC1xkGhHz8E az7T3IVyB/v4a/84rioWO1a9nYqr9HKBzmHg/Rj/mCx0hd/nNOjONMehWVwZ9cXOzBVc 4Cq0utoolDjKnM4p7/3QYkcjW+Iujvs69wcvCFMl2GQRWg2N1WCdJ1Mr9xO/cx5jJyo5 bvflT+LNpvrtoXRW3SvbvyHQEhmeKoyIqe1aUdOY6wpD3Jb8uPwbPv2Aa4s3i+ofo1eu rzog== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1787514073; x=1788118873; h=content-transfer-encoding:content-type:cc:to:from:subject :message-id:mime-version:date:x-gm-message-state:from:to:cc:subject :date:message-id:reply-to:content-type; bh=1YHDRXuyabVdapSHSXZFO8jE+pTDDymBWhtJlJpEAUs=; b=M7YotZHO36kYgkO2m4ncU+2cyxAh64ci4G8M8dPy8Q6jS3qFo1MTDGZZJ3RTuDMRnm igJVS8kwUnfjWhEwzUEPzhyPy0av+ayEYfmBVLmpEPpyQiYOgeKsCnbQxivA9OdtzUOF vvFIWmn6pJj9Ad348XhVegTYhCGfWK8X8o5Jam5stej1P9hgu25aTIWrmeoPessYOVB0 z6YtmG/QuHfy78+WAawJwX8OiyL6ry+MbAbuSOepR7ok/N+mH7zYsS1OLX9qj+dlLv9p MBZNetxeKSkCbhjn/I/dzcTxXXwGG1DlwT+kdV60X/WP0rbQM6PVdYnZAzWYoVDy6Mso Bl9Q== X-Forwarded-Encrypted: i=1; AHgh+Rqf1WsR7z4qMQQkxMYR1n2A69vIlvUPAkGzZYj8XFkaLfvJHYopu6JuWgJhM4VdOFvNgu9v+W5zljiJhfLgNOM=@vger.kernel.org X-Gm-Message-State: AFuF++k6iRcctQXlamtiMcN9/w7vSlxrF3+MG8jJMzSgQxZrxfNqnALx 2u1jqCAG3FmIgvDzTyeLbjO4ziVkbK57oEjq7hn3IEt0I6v0JwtnH+crU6ukINuE5cw+9rJo/Q6 0t0IP0A== X-Received: from pfcj21.prod.google.com ([2002:a05:6a00:1755:b0:848:3f4b:c4da]) (user=wyihan job=prod-delivery.src-stubby-dispatcher) by 2002:a05:6a00:997:b0:84a:29a7:f650 with SMTP id d2e1a72fcca58-8520b06403bmr21400701b3a.0.1787514072766; Sun, 23 Aug 2026 12:41:12 -0700 (PDT) Date: Sun, 23 Aug 2026 19:40:53 +0000 Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 X-B4-Tracking: v=1; b=H4sIAMVMi2oC/4WNQQ6CMBBFr0K6dkzTUEBX3sOwmLZTmIRS0yqRE O5uxQO4fC/5728iU2LK4lptItHCmeNcQJ8qYUecBwJ2hYWSqpFatRAoxLSCR55eiSB4cDThSg4 8v6F1GjtfY4edEaXxSFT00b/3hUfOzzI/7pb6a3/lRqo/5aUGCaiNbZ3ReDHqNsQ4THS2MYh+3 /cP6eGeecsAAAA= X-Change-Id: 20260527-memory-failure-mf-delayed-fix-7d5a8f4a8a8b X-Developer-Key: i=wyihan@google.com; a=ed25519; pk=cRi0fKzS5BMxlHyHY2pJv3w/1zcgfYKr6EYGYppdMYc= X-Developer-Signature: v=1; a=ed25519-sha256; t=1787514072; l=1927; i=wyihan@google.com; s=20260319; h=from:subject:message-id; bh=BmydyRyqabJ0xq1KtEZLfqJqBfIHdz1QSKABi+pLLAI=; b=aQ8VY631+PZ+8I90X2r+jykIUJ42Q/O5yclWaB3EPJYnhT9dbJJbqum/jUJQCww5qrZd1UDmT KWwnaZyjzf1Cp4Ox8aHXsiwWhudY/IUqGTsKjYbYdn1AS3GCUvptlH1 X-Mailer: b4 0.14.3 Message-ID: <20260823-memory-failure-mf-delayed-fix-v5-0-d97a5703e45a@google.com> Subject: [PATCH v5 0/5] mm: Fix MF_DELAYED handling on memory failure From: Lisa Wang To: Miaohe Lin , Naoya Horiguchi , Andrew Morton , Paolo Bonzini , Shuah Khan , Hugh Dickins , Baolin Wang , David Hildenbrand , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , linux-mm@kvack.org, linux-kernel@vger.kernel.org, kvm@vger.kernel.org, linux-kselftest@vger.kernel.org, Andi Kleen , Hidehiro Kawai , Rik van Riel , Yu Zhang , Lorenzo Stoakes , "Liam R. Howlett" Cc: rientjes@google.com, seanjc@google.com, ackerleytng@google.com, vannapurve@google.com, michael.roth@amd.com, jiaqiyan@google.com, tabba@google.com, dave.hansen@linux.intel.com, Lisa Wang , Isaku Yamahata , Xiaoyao Li Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Here's a fifth revision to fix MF_DELAYED handling on memory failure. This patch series addresses an issue in the memory failure handling path where MF_DELAYED is incorrectly treated as an error. This issue was discovered while testing memory failure handling for guest_memfd. The proposed solution involves - 1. Clarifying the definition of MF_DELAYED to mean that memory failure handling is only partially completed, and that the metadata for the memory that failed (as in struct page/folio) is still referenced. 2. Updating shmem=E2=80=99s handling to align with the clarified definition= . 3. Updating how the result of .error_remove_folio() is interpreted. Changes from v4: + Add "fallthrough;" in the memory-failure test, as suggested by David + Add Fixes tags in the commit message, as suggested by Miaohe + Rebase to the branch "mm-stable" + Split the KVM selftests to the future series Thanks for review from Ackerley, Andrew, David and Miaohe! + RFC v4: https://lore.kernel.org/all/20260602-memory-failure-mf-delayed-fi= x-v4-0-a5bc7db5a9b2@google.com/ Signed-off-by: Lisa Wang --- Lisa Wang (5): mm: memory_failure: Clarify the MF_DELAYED definition mm: memory_failure: Allow truncate_error_folio to return MF_DELAYED mm: shmem: Update shmem handler to the MF_DELAYED definition mm: memory_failure: Generalize extra_pins handling to all MF_DELAYED = cases mm: selftests: Add shmem into memory failure test mm/memory-failure.c | 29 ++++--- mm/shmem.c | 2 +- tools/testing/selftests/mm/memory-failure.c | 118 ++++++++++++++++++++++++= +++- 3 files changed, 130 insertions(+), 19 deletions(-) --- base-commit: 08745c62350126bc31b09548137be87e2866f628 change-id: 20260527-memory-failure-mf-delayed-fix-7d5a8f4a8a8b Best regards, --=20 Lisa Wang