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Mon, 18 Jan 2021 17:36:20 +0000 Subject: Re: [PATCH bpf-next v2 2/2] docs: bpf: Clarify -mcpu=v3 requirement for atomic ops To: Brendan Jackman , CC: Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko , KP Singh , Florent Revest , Lukas Bulwahn , , , Jonathan Corbet References: <20210118155735.532663-1-jackmanb@google.com> <20210118155735.532663-3-jackmanb@google.com> From: Yonghong Song Message-ID: <4cbd024b-b57e-e7ae-276a-a285c898bb30@fb.com> Date: Mon, 18 Jan 2021 09:36:17 -0800 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:78.0) Gecko/20100101 Thunderbird/78.6.1 In-Reply-To: <20210118155735.532663-3-jackmanb@google.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US X-Originating-IP: [2620:10d:c090:400::5:4199] X-ClientProxiedBy: MW4PR03CA0340.namprd03.prod.outlook.com (2603:10b6:303:dc::15) To BYAPR15MB4088.namprd15.prod.outlook.com (2603:10b6:a02:c3::18) X-MS-Exchange-MessageSentRepresentingType: 1 Received: from [IPv6:2620:10d:c085:21d6::10cf] (2620:10d:c090:400::5:4199) by MW4PR03CA0340.namprd03.prod.outlook.com (2603:10b6:303:dc::15) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3763.9 via Frontend Transport; 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X-MS-Exchange-AntiSpam-MessageData: =?utf-8?B?ODdWRW9rRXFtZ3VOOG9HdG5PT1RMMXA3Z3BJaUR5RUN1VVA4NjhFemZxMzNG?= =?utf-8?B?cytPK1dKdFliNlVOcDEwV3pEVXExWWYvemxZOGNFZmJMVVN1UFdaZFBNQ2dq?= =?utf-8?B?Z0pZZnZrOU5DUnB0aXhXR0VWdkwxN3pEOGxNTFhoZXJKQmEyV0Jia2NjajNl?= =?utf-8?B?RFFNekJVY1JoT3RReHpmcFZpM3ZoSFB1ck5vekY2UlE0ZlRXbnBSNmNDNU41?= =?utf-8?B?bDBpdVgyenZ4cGNwS1ZBc2xuY1NrcUZ2T2wzQXlUcStTVE9LQzVuaktGZXU2?= =?utf-8?B?VmtFa3R5ZFE5YzlDYXZTUW9Memw4eHdUZGdlSVRsVzIvQm1ENXY5VjlvYVIx?= =?utf-8?B?bjBXN2ttV3pMNXBtbm0zaG9nM2Q1OGRjOVdUSlFZYVUydk5YVGsvVmUxTFRm?= =?utf-8?B?dWJwU3FYZ1V6UFNRaHF5Rlc1ZUdQQnRrUWpqV2lBZGo5eTdMR2k3aEFudmZw?= =?utf-8?B?b1B6Wk5RR3BSYldib2FKaklPK0prNWw0di9uQUhWcks2MDY3TGVjUW9aVUFL?= =?utf-8?B?bHBaL0ZhYk1KM24xVnZ4THpMRkpkYkFSMnYzUGMwNFNLbmZXL1Z1RG5qRmV2?= =?utf-8?B?cklqMG00ZkROTHJucUIxME9FVFRwOTd2Z3RGSnpHK2JGVzJLZHQ0T0N1NSta?= =?utf-8?B?dEY0bFNUcnZBcmlGT0ZXYUZOMDhyZW8yeFl4MExtVy9DSmRLcVAvRTd0QXZx?= =?utf-8?B?VHJsMlIwTDJ0dVo3T3dSeTdwNDBqS1daNWgrWVdYdy9YaTlnd3NPWURTWkN5?= =?utf-8?B?cDFpL1MxYjFNdVBNTXNVTHpERG81a1hldFhrYzJmRGlvVHQ2bWR2NTZjZ1pm?= =?utf-8?B?M2pWNTZObHJ4dlRrN1gwTUlBU25GS0VnbTM4L0NzR0ZiUXk5eWdOck1TUmZ3?= =?utf-8?B?aXpCZVFzTEhIRE8zVHNUcEhNam1Cb1VHQXBuRmxrMVRaZ0I0Vy9RTTVjZmdS?= =?utf-8?B?MlFpMTlCVng1Mjh3U3ZQdk9YV2NjN3ovMkFTZkVFNmVpV294QkM1V3psRkt0?= =?utf-8?B?RW8rajhpQmlIMjIzTkViaGE1dFVJSzZrQ0lzNGZUTTh0eTYvM29RTkVJZWxh?= =?utf-8?B?b2QrUGtReTdyN3lBY2lKNVMrSWJ3TUNsa3dFZjVCYXdvREFxMmthbERUNC9y?= =?utf-8?B?T0xwdEFWUHdzczI5cFlZK0Nscnp6M0kzU2J4KzBubktkWnhiT3pYYmJ2eFJ1?= =?utf-8?B?WXBmVmdFeC84T1E5UDNkdnJNcmFrUmFleTh2MXRzMzcyaDJud3A4ZWMrcVhV?= =?utf-8?B?UVU5OFdETlY3b3FBOGJwaFhPN2hOc2ZaaFFPMFhVdUV6a1dsMlJSbGY5YTZE?= =?utf-8?B?R1FpU1YxMzhQeFU5OHRMaUE4V1BvdHFiUFFqbXMrcWI4NlU0TUJ4V2pRZ2k2?= =?utf-8?B?UUJJRWNtbldtRGc9PQ==?= X-MS-Exchange-CrossTenant-Network-Message-Id: f210539c-bdce-43e6-24be-08d8bbd79134 X-MS-Exchange-CrossTenant-AuthSource: BYAPR15MB4088.namprd15.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 18 Jan 2021 17:36:20.7308 (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: sl7LLcASS2eAnt0qE3eAAciVBZsouExexUK66S86M6cJcduWnlyj7cz7alYJIelr X-MS-Exchange-Transport-CrossTenantHeadersStamped: SJ0PR15MB4236 X-OriginatorOrg: fb.com Content-Transfer-Encoding: 7bit X-Proofpoint-UnRewURL: 0 URL was un-rewritten MIME-Version: 1.0 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.343,18.0.737 definitions=2021-01-18_13:2021-01-18,2021-01-18 signatures=0 X-Proofpoint-Spam-Details: rule=fb_default_notspam policy=fb_default score=0 mlxlogscore=927 lowpriorityscore=0 malwarescore=0 spamscore=0 suspectscore=0 clxscore=1011 adultscore=0 bulkscore=0 mlxscore=0 phishscore=0 priorityscore=1501 impostorscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2009150000 definitions=main-2101180106 X-FB-Internal: deliver Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 1/18/21 7:57 AM, Brendan Jackman wrote: > Alexei pointed out [1] that this wording is pretty confusing. Here's > an attempt to be more explicit and clear. > > [1] https://lore.kernel.org/bpf/CAADnVQJVvwoZsE1K+6qRxzF7+6CvZNzygnoBW9tZNWJELk5c=Q@mail.gmail.com/T/#m07264fc18fdc43af02fc1320968afefcc73d96f4 > > Signed-off-by: Brendan Jackman Thanks for better description! Acked-by: Yonghong Song