+ userfaultfd-selftests-hint-the-test-runner-on-required-privilege.patch added to -mm tree

[akpm@linux-foundation.org]

The patch titled
     Subject: userfaultfd/selftests: hint the test runner on required privilege
has been added to the -mm tree.  Its filename is
     userfaultfd-selftests-hint-the-test-runner-on-required-privilege.patch

This patch should soon appear at
    https://ozlabs.org/~akpm/mmots/broken-out/userfaultfd-selftests-hint-the-test-runner-on-required-privilege.patch
and later at
    https://ozlabs.org/~akpm/mmotm/broken-out/userfaultfd-selftests-hint-the-test-runner-on-required-privilege.patch

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------------------------------------------------------
From: Peter Xu <peterx@redhat.com>
Subject: 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>
---

 tools/testing/selftests/vm/userfaultfd.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/tools/testing/selftests/vm/userfaultfd.c~userfaultfd-selftests-hint-the-test-runner-on-required-privilege
+++ a/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) {
_

Patches currently in -mm which might be from peterx@redhat.com are

userfaultfd-selftests-always-dump-something-in-modes.patch
userfaultfd-selftests-fix-retval-check-for-userfaultfd_open.patch
userfaultfd-selftests-hint-the-test-runner-on-required-privilege.patch