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Mon, 07 Dec 2020 18:47:16 -0800 (PST) Received: from localhost.localdomain ([142.126.83.202]) by smtp.gmail.com with ESMTPSA id n95sm13778744qte.43.2020.12.07.18.47.14 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 07 Dec 2020 18:47:15 -0800 (PST) From: Peter Xu To: linux-kernel@vger.kernel.org, linux-mm@kvack.org Cc: Andrea Arcangeli , Andrew Morton , peterx@redhat.com, Mike Rapoport Subject: [PATCH 3/3] userfaultfd/selftests: Hint the test runner on required privilege Date: Mon, 7 Dec 2020 21:47:09 -0500 Message-Id: <20201208024709.7701-4-peterx@redhat.com> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20201208024709.7701-1-peterx@redhat.com> References: <20201208024709.7701-1-peterx@redhat.com> MIME-Version: 1.0 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=peterx@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: Now userfaultfd test program requires either root or ptrace privilege due= to the signal/event tests. When UFFDIO_API failed, hint the test runner abo= ut this fact verbosely. Signed-off-by: Peter Xu --- 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/sel= ftests/vm/userfaultfd.c index f0647bfda366..27a1709099d0 100644 --- a/tools/testing/selftests/vm/userfaultfd.c +++ b/tools/testing/selftests/vm/userfaultfd.c @@ -755,7 +755,8 @@ static int userfaultfd_open(int features) uffdio_api.api =3D UFFD_API; uffdio_api.features =3D 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 !=3D UFFD_API) { --=20 2.26.2