[PATCH v2 3/3] Turn off test_uffdio_wp if CONFIG_PTE_MARKER_UFFD_WP is not configured.

[Audra Mitchell]

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 <au...@redhat.com>
---
 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