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userfaultfd/selftests: hint the test runner on required privilege

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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 <peterx@redhat.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Mike Rapoport <rppt@linux.vnet.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Peter Xu 2020-12-14 19:14:08 -08:00 committed by Linus Torvalds
parent 1e17a24edf
commit d9f411bacf
1 changed files with 2 additions and 1 deletions
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3
tools/testing/selftests/vm/userfaultfd.c
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@ -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) {