Introduce the PAGE_IS_GUARD flag in the PAGEMAP_SCAN ioctl to expose information about guard regions. This allows userspace tools, such as CRIU, to detect and handle guard regions. This series should be applied on top of "[PATCH 0/2] fs/proc/task_mmu: add guard region bit to pagemap": https://lore.kernel.org/all/2025031926-engraved-footer-3e9b@gregkh/T/ The series includes updates to the documentation and selftests to reflect the new functionality. Andrei Vagin (2): fs/proc: extend the PAGEMAP_SCAN ioctl to report guard regions selftests/mm: add PAGEMAP_SCAN guard region test Documentation/admin-guide/mm/pagemap.rst | 1 + fs/proc/task_mmu.c | 8 +++- include/uapi/linux/fs.h | 1 + tools/testing/selftests/mm/guard-regions.c | 53 ++++++++++++++++++++++ 4 files changed, 61 insertions(+), 2 deletions(-) -- 2.49.0.rc1.451.g8f38331e32-goog
