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charset="utf-8" Gracefully skip test if userfaultfd is not supported (ENOSYS) or not permitted (EPERM), instead of failing. This avoids misleading failures with clear skip messages. Acked-by: David Hildenbrand Reviewed-by: Zi Yan -------------- Before Patch -------------- ~ running ./hugepage-mremap ... ~ Bail out! userfaultfd: Function not implemented ~ Planned tests !=3D run tests (1 !=3D 0) ~ Totals: pass:0 fail:0 xfail:0 xpass:0 skip:0 error:0 ~ [FAIL] not ok 4 hugepage-mremap # exit=3D1 -------------- After Patch -------------- ~ running ./hugepage-mremap ... ~ ok 2 # SKIP userfaultfd is not supported/not enabled. ~ 1 skipped test(s) detected. ~ Totals: pass:0 fail:0 xfail:0 xpass:0 skip:1 error:0 ~ [SKIP] ok 4 hugepage-mremap # SKIP Signed-off-by: Aboorva Devarajan --- tools/testing/selftests/mm/hugepage-mremap.c | 16 +++++++++++++--- 1 file changed, 13 insertions(+), 3 deletions(-) diff --git a/tools/testing/selftests/mm/hugepage-mremap.c b/tools/testing/s= elftests/mm/hugepage-mremap.c index c463d1c09c9b..1a0e6dd87578 100644 --- a/tools/testing/selftests/mm/hugepage-mremap.c +++ b/tools/testing/selftests/mm/hugepage-mremap.c @@ -65,10 +65,20 @@ static void register_region_with_uffd(char *addr, size_= t len) struct uffdio_api uffdio_api; =20 /* Create and enable userfaultfd object. */ - uffd =3D syscall(__NR_userfaultfd, O_CLOEXEC | O_NONBLOCK); - if (uffd =3D=3D -1) - ksft_exit_fail_msg("userfaultfd: %s\n", strerror(errno)); + if (uffd =3D=3D -1) { + switch (errno) { + case EPERM: + ksft_exit_skip("No userfaultfd permissions, try running as root.\n"); + break; + case ENOSYS: + ksft_exit_skip("userfaultfd is not supported/not enabled.\n"); + break; + default: + ksft_exit_fail_msg("userfaultfd failed with %s\n", strerror(errno)); + break; + } + } =20 uffdio_api.api =3D UFFD_API; uffdio_api.features =3D 0; --=20 2.43.5