From d9f411bacfa0c3d0d97580a66f88e70f92bcf58e Mon Sep 17 00:00:00 2001 From: Peter Xu Date: Mon, 14 Dec 2020 19:14:08 -0800 Subject: [PATCH] userfaultfd/selftests: hint the test runner on required privilege Now userfaultfd test program requires either root or ptrace privilege due to the signal/event tests. When UFFDIO_API failed, hint the test runner about this fact verbosely. Link: https://lkml.kernel.org/r/20201208024709.7701-4-peterx@redhat.com Signed-off-by: Peter Xu Cc: Andrea Arcangeli Cc: Mike Rapoport Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- tools/testing/selftests/vm/userfaultfd.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/tools/testing/selftests/vm/userfaultfd.c b/tools/testing/selftests/vm/userfaultfd.c index 6e482e2..9d8650d 100644 --- a/tools/testing/selftests/vm/userfaultfd.c +++ b/tools/testing/selftests/vm/userfaultfd.c @@ -794,7 +794,8 @@ static int userfaultfd_open(int features) uffdio_api.api = UFFD_API; uffdio_api.features = features; if (ioctl(uffd, UFFDIO_API, &uffdio_api)) { - fprintf(stderr, "UFFDIO_API\n"); + fprintf(stderr, "UFFDIO_API failed.\nPlease make sure to " + "run with either root or ptrace capability.\n"); return 1; } if (uffdio_api.api != UFFD_API) { -- 2.7.4