If CONFIG_PTE_MARKER_UFFD_WP is disabled, then testing with test_uffdio_up enables calling uffdio_regsiter with the flag UFFDIO_REGISTER_MODE_WP. The kernel ensures in vma_can_userfault() that if CONFIG_PTE_MARKER_UFFD_WP is disabled, only allow the VM_UFFD_WP on anonymous vmas. Signed-off-by: Audra Mitchell <audra@xxxxxxxxxx> --- tools/testing/selftests/mm/uffd-stress.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/tools/testing/selftests/mm/uffd-stress.c b/tools/testing/selftests/mm/uffd-stress.c index b9b6d858eab8..2601c9dfadd6 100644 --- a/tools/testing/selftests/mm/uffd-stress.c +++ b/tools/testing/selftests/mm/uffd-stress.c @@ -419,6 +419,9 @@ static void parse_test_type_arg(const char *raw_type) test_uffdio_wp = test_uffdio_wp && (features & UFFD_FEATURE_PAGEFAULT_FLAG_WP); + if (test_type != TEST_ANON && !(features & UFFD_FEATURE_WP_UNPOPULATED)) + test_uffdio_wp = false; + close(uffd); uffd = -1; } -- 2.44.0
