[0/2] fs/proc/task_mmu: add guard region bit to pagemap

Message

Lorenzo Stoakes Feb. 21, 2025, 12:05 p.m. UTC

Currently there is no means of determining whether a give page in a mapping
range is designated a guard region (as installed via madvise() using the
MADV_GUARD_INSTALL flag).

This is generally not an issue, but in some instances users may wish to
determine whether this is the case.

This series adds this ability via /proc/$pid/pagemap, updates the
documentation and adds a self test to assert that this functions correctly.

Lorenzo Stoakes (2):
  fs/proc/task_mmu: add guard region bit to pagemap
  tools/selftests: add guard region test for /proc/$pid/pagemap

 Documentation/admin-guide/mm/pagemap.rst   |  3 +-
 fs/proc/task_mmu.c                         |  6 ++-
 tools/testing/selftests/mm/guard-regions.c | 47 ++++++++++++++++++++++
 tools/testing/selftests/mm/vm_util.h       |  1 +
 4 files changed, 55 insertions(+), 2 deletions(-)

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2.48.1