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Sat, 14 Mar 2020 00:34:17 +0000 Date: Fri, 13 Mar 2020 17:34:14 -0700 From: Martin KaFai Lau To: Andrii Nakryiko CC: , , , , , Subject: Re: [PATCH v2 bpf-next] selftests/bpf: fix nanosleep for real this time Message-ID: <20200314003414.srdn7idaht7zlecb@kafai-mbp> References: <20200314002743.3782677-1-andriin@fb.com> Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20200314002743.3782677-1-andriin@fb.com> User-Agent: NeoMutt/20180716 X-ClientProxiedBy: MWHPR21CA0045.namprd21.prod.outlook.com (2603:10b6:300:129::31) To BYAPR15MB2278.namprd15.prod.outlook.com (2603:10b6:a02:8e::17) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from kafai-mbp (2620:10d:c090:400::5:ad28) by MWHPR21CA0045.namprd21.prod.outlook.com (2603:10b6:300:129::31) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.2835.6 via Frontend Transport; Sat, 14 Mar 2020 00:34:16 +0000 X-Originating-IP: [2620:10d:c090:400::5:ad28] X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 98ec1126-9f4c-4297-fbef-08d7c7af6dcd X-MS-TrafficTypeDiagnostic: BYAPR15MB3431: X-MS-Exchange-Transport-Forked: True X-Microsoft-Antispam-PRVS: X-FB-Source: Internal X-MS-Oob-TLC-OOBClassifiers: OLM:6790; X-Forefront-PRVS: 034215E98F X-Forefront-Antispam-Report: SFV:NSPM;SFS:(10019020)(346002)(396003)(366004)(376002)(136003)(39860400002)(199004)(66556008)(6636002)(81156014)(478600001)(316002)(8676002)(66946007)(81166006)(33716001)(16526019)(8936002)(86362001)(66476007)(4326008)(6862004)(5660300002)(55016002)(6496006)(186003)(4744005)(2906002)(9686003)(52116002)(1076003);DIR:OUT;SFP:1102;SCL:1;SRVR:BYAPR15MB3431;H:BYAPR15MB2278.namprd15.prod.outlook.com;FPR:;SPF:None;LANG:en;PTR:InfoNoRecords;A:1; Received-SPF: None (protection.outlook.com: fb.com does not designate permitted sender hosts) X-MS-Exchange-SenderADCheck: 1 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: NJXYq9iyW9ARs2OTfKkDgohQ2y1zojSIrP799Za0Dr0xOMCYnVnOj0qCB4ZfVrnIjMANtkx5GAJQanJMST0Q8/ZLuuScEPXw8TgfG6IfwanHf2SzE4mM3IkrxQOtnpBGmgq3XZtLxnp/GmpB/gNaTu/UT8eXtZZTh3nwZdQgBhPCKOaLyl7Jz7hFvu3/qlCNIwQXtwFcPvhGa0luyLitdiys0vwdeGOtjo+C/TmzMIrqMKetAuPlm4crunApT+k3JuX6ZGToiliPk51Zl/WLnEBDdzoc+pyeUcpBqTQ1tJwJY37b+DVUY73fKITet7hzkQsRN6B4XFPitng5acHow9/yJsukRO+iFvR9Qis63dCXHeWTlnKJdvFVA/Ghfq26hO5trqpcsezDWWEgxXugSh6Jzae/ZBp9N5BK7rG9zITgIAWkJ835kCenAgEqYBU0 X-MS-Exchange-AntiSpam-MessageData: rYSDUCpL3lDjRQeOX1XmpATvksH72WhBzT3EOVFDIclrtGU3+M6kibVv1/QSrjkfJdaRSOnBtCoH7gZmseWD0VEUvIiQETjYCIs2kxumAjMez51nI0MeNmBPShbI6ZKTWTBJPku6VZQ0oF5DznNeaKsAxNqtu3r6k0+Y3qi1fJt2MbszdE8DuJvWot6mEqyF X-MS-Exchange-CrossTenant-Network-Message-Id: 98ec1126-9f4c-4297-fbef-08d7c7af6dcd X-MS-Exchange-CrossTenant-OriginalArrivalTime: 14 Mar 2020 00:34:17.2973 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 8ae927fe-1255-47a7-a2af-5f3a069daaa2 X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: 7DN8SG6UPloJiPgjEq5oj4NSf9z8D8qbmIx7KLnvQF7UgDxDsdHNF1JddLILFr1E X-MS-Exchange-Transport-CrossTenantHeadersStamped: BYAPR15MB3431 X-OriginatorOrg: fb.com X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.138,18.0.572 definitions=2020-03-13_12:2020-03-12,2020-03-13 signatures=0 X-Proofpoint-Spam-Details: rule=fb_default_notspam policy=fb_default score=0 mlxscore=0 malwarescore=0 suspectscore=0 lowpriorityscore=0 spamscore=0 priorityscore=1501 impostorscore=0 phishscore=0 mlxlogscore=640 clxscore=1015 bulkscore=0 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2003020000 definitions=main-2003140000 X-FB-Internal: deliver Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org On Fri, Mar 13, 2020 at 05:27:43PM -0700, Andrii Nakryiko wrote: > Amazingly, some libc implementations don't call __NR_nanosleep syscall from > their nanosleep() APIs. Hammer it down with explicit syscall() call and never > get back to it again. Also simplify code for timespec initialization. > > I verified that nanosleep is called w/ printk and in exactly same Linux image > that is used in Travis CI. So it should both sleep and call correct syscall. > > v1->v2: > - math is too hard, fix usec -> nsec convertion (Martin); > - test_vmlinux has explicit nanosleep() call, convert that one as well. Acked-by: Martin KaFai Lau