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’s 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-fix-v5-0-d97a5703e45a@google.com/
Signed-off-by: Lisa Wang <wyihan@google.com>
---
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,
--
Lisa Wang <wyihan@google.com>