From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-15.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 86C01C4361B for ; Tue, 15 Dec 2020 03:15:51 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 6184E223C8 for ; Tue, 15 Dec 2020 03:15:51 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727395AbgLODPj (ORCPT ); Mon, 14 Dec 2020 22:15:39 -0500 Received: from mail.kernel.org ([198.145.29.99]:42832 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727688AbgLODOt (ORCPT ); Mon, 14 Dec 2020 22:14:49 -0500 Date: Mon, 14 Dec 2020 19:14:08 -0800 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux-foundation.org; s=korg; t=1608002049; bh=u7TzzMQBDwwpI7MWC0iskNj6ZmvXup5OdBQzSGEWpfI=; h=From:To:Subject:In-Reply-To:From; b=cvkl6+f1CFubgK9F2ogf9ySjfBiTpIcjfZzeiZRdfUjkuanv8rZOWlUFvlry54hqp pw/sWxJ00Eba0Hh5Vu83tWNeFD1sgcCeq23Ih2KEZDgEwPzEhiQ9r+KyQjiFDGoVdt 8SFn1FbweEyyX3boGtKbOhDeZqsMN22sgv8ODY4Y= From: Andrew Morton To: aarcange@redhat.com, akpm@linux-foundation.org, linux-mm@kvack.org, mm-commits@vger.kernel.org, peterx@redhat.com, rppt@linux.vnet.ibm.com, torvalds@linux-foundation.org Subject: [patch 184/200] userfaultfd/selftests: hint the test runner on required privilege Message-ID: <20201215031408.sg3WTH3UE%akpm@linux-foundation.org> In-Reply-To: <20201214190237.a17b70ae14f129e2dca3d204@linux-foundation.org> User-Agent: s-nail v14.8.16 Precedence: bulk Reply-To: linux-kernel@vger.kernel.org List-ID: X-Mailing-List: mm-commits@vger.kernel.org From: Peter Xu 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 Cc: Andrea Arcangeli Cc: Mike Rapoport Signed-off-by: Andrew Morton --- 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) { _