selftests/mm: skip uffd-wp-mremap if userfaultfd not available

It's obvious that this should fail in that case, but still, save the
reader the effort of figuring out that they've run into this by just
SKIPping

Link: https://lkml.kernel.org/r/20250311-mm-selftests-v4-3-dec210a658f5@google.com
Signed-off-by: Brendan Jackman <jackmanb@google.com>
Reviewed-by: Dev Jain <dev.jain@arm.com>
Cc: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Cc: Mateusz Guzik <mjguzik@gmail.com>
Cc: Shuah Khan <shuah@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

diff --git a/tools/testing/selftests/mm/uffd-wp-mremap.c b/tools/testing/selftests/mm/uffd-wp-mremap.c
index 2c4f984..c2ba7d4 100644 (file)
--- a/tools/testing/selftests/mm/uffd-wp-mremap.c
+++ b/tools/testing/selftests/mm/uffd-wp-mremap.c
@@ -182,7 +182,10 @@ static void test_one_folio(size_t size, bool private, bool swapout, bool hugetlb
 
        /* Register range for uffd-wp. */
        if (userfaultfd_open(&features)) {
-               ksft_test_result_fail("userfaultfd_open() failed\n");
+               if (errno == ENOENT)
+                       ksft_test_result_skip("userfaultfd not available\n");
+               else
+                       ksft_test_result_fail("userfaultfd_open() failed\n");
                goto out;
        }
        if (uffd_register(uffd, mem, size, false, true, false)) {