diff options
| author | Peter Xu <peterx@redhat.com> | 2023-04-12 12:45:17 -0400 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2023-04-18 16:30:07 -0700 |
| commit | 4df9cefa9419718c32259c105ac8fbbc680410f7 (patch) | |
| tree | a280b2b7099b80755bfa6843bc2ffa370b82730e /tools/testing/selftests/mm | |
| parent | c3315502c92406ec5bf36ba687f9651b43f838f6 (diff) | |
selftests/mm: workaround no way to detect uffd-minor + wp
Userfaultfd minor+wp mode was very recently added. The test will fail on
the old kernels at ioctl(UFFDIO_CONTINUE) which is misterious.
Unfortunately there's no feature bit to detect for this support.
Add a hack to leverage WP_UNPOPULATED to detect whether that feature
existed, since WP_UNPOPULATED was merged right after minor+wp.
Link: https://lkml.kernel.org/r/20230412164517.329152-1-peterx@redhat.com
Signed-off-by: Peter Xu <peterx@redhat.com>
Cc: Axel Rasmussen <axelrasmussen@google.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Dmitry Safonov <0x7f454c46@gmail.com>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Cc: Mike Rapoport (IBM) <rppt@kernel.org>
Cc: Zach O'Keefe <zokeefe@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'tools/testing/selftests/mm')
| -rw-r--r-- | tools/testing/selftests/mm/uffd-unit-tests.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/tools/testing/selftests/mm/uffd-unit-tests.c b/tools/testing/selftests/mm/uffd-unit-tests.c index 160bd8ccda55..a33d6c928eeb 100644 --- a/tools/testing/selftests/mm/uffd-unit-tests.c +++ b/tools/testing/selftests/mm/uffd-unit-tests.c @@ -780,7 +780,13 @@ uffd_test_case_t uffd_tests[] = { .mem_targets = MEM_SHMEM | MEM_HUGETLB, .uffd_feature_required = UFFD_FEATURE_MINOR_HUGETLBFS | UFFD_FEATURE_MINOR_SHMEM | - UFFD_FEATURE_PAGEFAULT_FLAG_WP, + UFFD_FEATURE_PAGEFAULT_FLAG_WP | + /* + * HACK: here we leveraged WP_UNPOPULATED to detect whether + * minor mode supports wr-protect. There's no feature flag + * for it so this is the best we can test against. + */ + UFFD_FEATURE_WP_UNPOPULATED, }, { .name = "minor-collapse", |