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Tue, 12 May 2020 14:26:50 +0000 Subject: Re: [PATCH bpf-next v4] libbpf: fix probe code to return EPERM if encountered To: Eelco Chaudron , CC: , , , , , , , References: <158927424896.2342.10402475603585742943.stgit@ebuild> From: Yonghong Song Message-ID: <7e23f4d2-7cc5-9976-dead-ad2e993015ab@fb.com> Date: Tue, 12 May 2020 07:26:47 -0700 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:68.0) Gecko/20100101 Thunderbird/68.8.0 In-Reply-To: <158927424896.2342.10402475603585742943.stgit@ebuild> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit X-ClientProxiedBy: BYAPR02CA0064.namprd02.prod.outlook.com (2603:10b6:a03:54::41) To BYAPR15MB4088.namprd15.prod.outlook.com (2603:10b6:a02:c3::18) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from MacBook-Pro-52.local (2620:10d:c090:400::5:d0f0) by BYAPR02CA0064.namprd02.prod.outlook.com (2603:10b6:a03:54::41) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.2979.27 via Frontend Transport; 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X-MS-Exchange-AntiSpam-MessageData: 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 X-MS-Exchange-CrossTenant-Network-Message-Id: 57df26ac-a8b4-4662-1c30-08d7f6808252 X-MS-Exchange-CrossTenant-OriginalArrivalTime: 12 May 2020 14:26:50.1329 (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: Vff0NBR9GUTPfcLimzrlzp3zQaZSD01Agd75cMzX22wUsrebicSpDSt/WG+uHtNq X-MS-Exchange-Transport-CrossTenantHeadersStamped: BYAPR15MB2360 X-OriginatorOrg: fb.com X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.216,18.0.676 definitions=2020-05-12_04:2020-05-11,2020-05-12 signatures=0 X-Proofpoint-Spam-Details: rule=fb_default_notspam policy=fb_default score=0 clxscore=1015 mlxlogscore=999 priorityscore=1501 lowpriorityscore=0 suspectscore=0 adultscore=0 impostorscore=0 malwarescore=0 bulkscore=0 spamscore=0 mlxscore=0 phishscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2003020000 definitions=main-2005120109 X-FB-Internal: deliver Sender: bpf-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org On 5/12/20 2:04 AM, Eelco Chaudron wrote: > When the probe code was failing for any reason ENOTSUP was returned, even > if this was due to no having enough lock space. This patch fixes this by > returning EPERM to the user application, so it can respond and increase > the RLIMIT_MEMLOCK size. > > Signed-off-by: Eelco Chaudron Acked-by: Yonghong Song