Mark Brown reported seeing a regression in -next on 32 bit arm with the mlock selftests. Before exiting and marking the tests failed, the following message was logged after an attempt to create a MAP_DROPPABLE mapping:
Bail out! mmap error: Unknown error 524 It turns out error 524 is ENOTSUPP which is an error that userspace is not supposed to see, but it indicates in this instance that MAP_DROPPABLE is not supported. The first patch changes the errno returned to EOPNOTSUPP. The second patch is a second version of a prior patch to introduce selftests to verify locking behavior with droppable mappings with the additonal change to skip the tests when MAP_DROPPABLE is not supported. v2: - Remove unnecessary mlock() call from selftest (DavidH) - Change tests to not exit on failure (DavidH) Anthony Yznaga (2): mm: fix mmap errno value when MAP_DROPPABLE is not supported selftests/mm: verify droppable mappings cannot be locked mm/mmap.c | 2 +- tools/testing/selftests/mm/mlock2-tests.c | 87 ++++++++++++++++++++--- 2 files changed, 79 insertions(+), 10 deletions(-) -- 2.47.3
