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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 <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>
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@ -794,7 +794,8 @@ static int userfaultfd_open(int features)
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uffdio_api.api = UFFD_API;
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uffdio_api.features = features;
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if (ioctl(uffd, UFFDIO_API, &uffdio_api)) {
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fprintf(stderr, "UFFDIO_API\n");
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fprintf(stderr, "UFFDIO_API failed.\nPlease make sure to "
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"run with either root or ptrace capability.\n");
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return 1;
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}
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if (uffdio_api.api != UFFD_API) {
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