From patchwork Tue Aug 28 17:26:05 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Thiago Jung Bauermann X-Patchwork-Id: 10578905 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 6A14F175A for ; Tue, 28 Aug 2018 17:26:36 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 4C3CF2A8DB for ; Tue, 28 Aug 2018 17:26:36 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 4040B2A904; Tue, 28 Aug 2018 17:26:36 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id C8B532A8DB for ; Tue, 28 Aug 2018 17:26:35 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727405AbeH1VTM (ORCPT ); Tue, 28 Aug 2018 17:19:12 -0400 Received: from mx0b-001b2d01.pphosted.com ([148.163.158.5]:43390 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1726996AbeH1VTM (ORCPT ); Tue, 28 Aug 2018 17:19:12 -0400 Received: from pps.filterd (m0098419.ppops.net [127.0.0.1]) by mx0b-001b2d01.pphosted.com (8.16.0.22/8.16.0.22) with SMTP id w7SHImvY030614 for ; Tue, 28 Aug 2018 13:26:31 -0400 Received: from e14.ny.us.ibm.com (e14.ny.us.ibm.com [129.33.205.204]) by mx0b-001b2d01.pphosted.com with ESMTP id 2m57d69cv4-1 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=NOT) for ; Tue, 28 Aug 2018 13:26:31 -0400 Received: from localhost by e14.ny.us.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! 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Violators will be prosecuted; (version=TLSv1/SSLv3 cipher=AES256-GCM-SHA384 bits=256/256) Tue, 28 Aug 2018 13:26:26 -0400 Received: from b01ledav004.gho.pok.ibm.com (b01ledav004.gho.pok.ibm.com [9.57.199.109]) by b01cxnp22033.gho.pok.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id w7SHQPcm41615436 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=FAIL); Tue, 28 Aug 2018 17:26:25 GMT Received: from b01ledav004.gho.pok.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 693F3112062; Tue, 28 Aug 2018 13:26:00 -0400 (EDT) Received: from b01ledav004.gho.pok.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 85A4F112064; Tue, 28 Aug 2018 13:25:58 -0400 (EDT) Received: from morokweng.localdomain.com (unknown [9.80.236.98]) by b01ledav004.gho.pok.ibm.com (Postfix) with ESMTP; Tue, 28 Aug 2018 13:25:58 -0400 (EDT) From: Thiago Jung Bauermann To: linux-kselftest@vger.kernel.org Cc: linux-kernel@vger.kernel.org, Shuah Khan , Andrea Arcangeli , Mike Rapoport , Prakash Sangappa , Thiago Jung Bauermann Subject: [PATCH v3 1/4] userfaultfd: selftest: Fix checking of userfaultfd_open() result Date: Tue, 28 Aug 2018 14:26:05 -0300 X-Mailer: git-send-email 2.14.4 In-Reply-To: <20180828172608.30075-1-bauerman@linux.ibm.com> References: <20180828172608.30075-1-bauerman@linux.ibm.com> X-TM-AS-GCONF: 00 x-cbid: 18082817-0052-0000-0000-000003275025 X-IBM-SpamModules-Scores: X-IBM-SpamModules-Versions: BY=3.00009627; HX=3.00000242; KW=3.00000007; PH=3.00000004; SC=3.00000266; SDB=6.01080161; UDB=6.00557147; IPR=6.00860145; MB=3.00022981; MTD=3.00000008; XFM=3.00000015; UTC=2018-08-28 17:26:28 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 18082817-0053-0000-0000-00005DE25E03 Message-Id: <20180828172608.30075-2-bauerman@linux.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:,, definitions=2018-08-28_07:,, signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 suspectscore=1 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1807170000 definitions=main-1808280173 Sender: linux-kselftest-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kselftest@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP If the userfaultfd test is run on a kernel with CONFIG_USERFAULTFD=n, it will report that the system call is not available yet go ahead and continue anyway: # ./userfaultfd anon 30 1 nr_pages: 480, nr_pages_per_cpu: 120 userfaultfd syscall not available in this kernel bounces: 0, mode:, register failure This is because userfaultfd_open() returns 0 on success and 1 on error but all callers assume that it returns < 0 on error. Since the convention of the test as a whole is the one used by userfault_open(), fix its callers instead. Now the test behaves correctly: # ./userfaultfd anon 30 1 nr_pages: 480, nr_pages_per_cpu: 120 userfaultfd syscall not available in this kernel Signed-off-by: Thiago Jung Bauermann Reviewed-by: Mike Rapoport --- tools/testing/selftests/vm/userfaultfd.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/tools/testing/selftests/vm/userfaultfd.c b/tools/testing/selftests/vm/userfaultfd.c index 7b8171e3128a..e4099afe7557 100644 --- a/tools/testing/selftests/vm/userfaultfd.c +++ b/tools/testing/selftests/vm/userfaultfd.c @@ -859,7 +859,7 @@ static int userfaultfd_zeropage_test(void) if (uffd_test_ops->release_pages(area_dst)) return 1; - if (userfaultfd_open(0) < 0) + if (userfaultfd_open(0)) return 1; uffdio_register.range.start = (unsigned long) area_dst; uffdio_register.range.len = nr_pages * page_size; @@ -902,7 +902,7 @@ static int userfaultfd_events_test(void) features = UFFD_FEATURE_EVENT_FORK | UFFD_FEATURE_EVENT_REMAP | UFFD_FEATURE_EVENT_REMOVE; - if (userfaultfd_open(features) < 0) + if (userfaultfd_open(features)) return 1; fcntl(uffd, F_SETFL, uffd_flags | O_NONBLOCK); @@ -961,7 +961,7 @@ static int userfaultfd_sig_test(void) return 1; features = UFFD_FEATURE_EVENT_FORK|UFFD_FEATURE_SIGBUS; - if (userfaultfd_open(features) < 0) + if (userfaultfd_open(features)) return 1; fcntl(uffd, F_SETFL, uffd_flags | O_NONBLOCK); @@ -1027,7 +1027,7 @@ static int userfaultfd_stress(void) if (!area_dst) return 1; - if (userfaultfd_open(0) < 0) + if (userfaultfd_open(0)) return 1; count_verify = malloc(nr_pages * sizeof(unsigned long long));