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a=ed25519; pk=cRi0fKzS5BMxlHyHY2pJv3w/1zcgfYKr6EYGYppdMYc= X-Developer-Signature: v=1; a=ed25519-sha256; t=1789677906; l=1740; i=wyihan@google.com; s=20260319; h=from:subject:message-id; bh=Am2jKIW9EJEt0JmvNafH4y2xjpYHkskddR3CBeqh7Zw=; b=/wh3h4RwP/TLeQrHX1ATtrr76sHTMiPuM2R+SJAOB0ZNs9zkKo19zhJPXOol9dk/vZK8KxzTh kMzeBBM0ciYCOfVQNYSBsGFmVAddo2DxqCG+W/jupYzZWJ8KL9ooBKj X-Mailer: b4 0.14.3 Message-ID: <20260917-memory-failure-mf-delayed-fix-v6-0-4b00856b5364@google.com> Subject: [PATCH v6 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 sixth 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 v5: Add comment-style fallthrough in the memory-failure test, as suggested by Ackerley and David + RFC v5: https://lore.kernel.org/all/20260823-memory-failure-mf-delayed-fi= x-v5-0-d97a5703e45a@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 | 114 ++++++++++++++++++++++++= +++- 3 files changed, 126 insertions(+), 19 deletions(-) --- base-commit: 08745c62350126bc31b09548137be87e2866f628 change-id: 20260527-memory-failure-mf-delayed-fix-7d5a8f4a8a8b Best regards, --=20 Lisa Wang