[PATCH 2/2] kselftests: mm: Fail the test if userfaultfd syscall isn't found

[Muhammad Usama Anjum <usama.anjum@collabora.com>]

The userfaultfd is enabled in the config fragment of mm selftest suite.
It must always be present. If it isn't present, we should throw error
and not just skip. This would have helped us catch the test breakage.
Adding this now to catch the future breakages.

Signed-off-by: Muhammad Usama Anjum <usama.anjum@collabora.com>
---
 tools/testing/selftests/mm/pagemap_ioctl.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/testing/selftests/mm/pagemap_ioctl.c b/tools/testing/selftests/mm/pagemap_ioctl.c
index bcc73b4e805c6..d83dda8edf62c 100644
--- a/tools/testing/selftests/mm/pagemap_ioctl.c
+++ b/tools/testing/selftests/mm/pagemap_ioctl.c
@@ -95,7 +95,7 @@ int init_uffd(void)
 
 	uffd = syscall(__NR_userfaultfd, O_CLOEXEC | O_NONBLOCK | UFFD_USER_MODE_ONLY);
 	if (uffd == -1)
-		return uffd;
+		ksft_exit_fail_perror("Userfaultfd syscall failed");
 
 	uffdio_api.api = UFFD_API;
 	uffdio_api.features = UFFD_FEATURE_WP_UNPOPULATED | UFFD_FEATURE_WP_ASYNC |
-- 
2.39.2