Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18;
Message-ID: <e2aa81ef-2fd8-52c0-2b23-09addc3e4aa4@fb.com>
Date:   Tue, 2 Nov 2021 19:30:40 -0700
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:91.0)
 Gecko/20100101 Thunderbird/91.2.1
Subject: Re: [PATCH bpf-next] samples: bpf: Suppress readelf stderr when
 probing for BTF support
Content-Language: en-US
To:     Pu Lehui <pulehui@huawei.com>, <ast@kernel.org>,
        <daniel@iogearbox.net>, <andrii@kernel.org>, <kafai@fb.com>,
        <songliubraving@fb.com>, <john.fastabend@gmail.com>,
        <kpsingh@kernel.org>, <nathan@kernel.org>,
        <ndesaulniers@google.com>
CC:     <netdev@vger.kernel.org>, <bpf@vger.kernel.org>,
        <linux-kernel@vger.kernel.org>, <llvm@lists.linux.dev>
References: <20211021123913.48833-1-pulehui@huawei.com>
From:   Yonghong Song <yhs@fb.com>
In-Reply-To: <20211021123913.48833-1-pulehui@huawei.com>
Content-Type: text/plain; charset="UTF-8"; format=flowed
Content-Transfer-Encoding: 7bit
MIME-Version: 1.0
X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1
X-MS-Exchange-AntiSpam-MessageData-0: =?utf-8?B?dnh6N3UzdlJMUEdQL1hZR2xlMFhUMTRXQXBZaGZxVnMzZlV0Nm5wTGhnSTNV?=
 =?utf-8?B?bFV6VUVWU3krdHBqdENsamFTR1VyYjllQTYwb2dqNmR6MFo2d3Z3MnNqT1B6?=
 =?utf-8?B?cXNZVW5NMHhCYUFlTFV5NGMvejIrQmJOZklIaVJ1ZHVTYklXdWdxQW81Z1dM?=
 =?utf-8?B?cnlIYlhxdlRkbnpucW5PZit1b1NHblVWVmZjZ2VTVUhHVjM2bnRhYUkzY1dP?=
 =?utf-8?B?R0cxYXpsOE5OMWFpQW9Ia0Vwc3hsWU5rMEhGVXdLbXhpcXRuZWJ3bDZpdEpa?=
 =?utf-8?B?SkU2T0krR3hFb3NxYk1ab3VLcFlINHRmMExPcCtZZ1V6L0FZNmJ5Z2M5TjQ2?=
 =?utf-8?B?VUVRZzRYLzRVc0JRZUZHN0VPWkNmRE91RU9XZmRseEhsWDgxeE1OcURlMkJw?=
 =?utf-8?B?RTdhZC9UR3FQZHh2eVlJdmFXU2Z2VlBqNWtPUFR3dWZnTTJNSFpWQkk1SjNI?=
 =?utf-8?B?ZURlcS9SR21wY2JSeVljdUl4TEpIQnplL3JHSzhKRkRwNlZEcm9NM2k3WGpG?=
 =?utf-8?B?R2RCdUp0QXJDY3o0NDVaL3U0eDRkK0ViKzFYZEo0aFpuWUpKSGxJd0VsZTFk?=
 =?utf-8?B?dWUzdi84K3ZCM2MzU0hOVjJHSTVHY1hEUytzZVlHV1hWbnRhNGtqMS9IQVkw?=
 =?utf-8?B?OXdpeDJ1ckM2dThzRmNQY3dVVWt1NVMzVENiRnhrbEJjS1phVlk0TUlFcFRu?=
 =?utf-8?B?VDdJWHhubFVWQzZ5djY5T3FnTGZ6U0tYcTRGelllOVFnR1JQblNhWThrRHYx?=
 =?utf-8?B?YkFrM0lPditkckhKVXJ6NmlXK05veTdoSFBaZzRyK1dZdXRqbUlRREI1YWw5?=
 =?utf-8?B?Q3hVMUU5NWl0VUpsbjFobzJBTDBnc1g2VDF0NE9zdDJtN0Jzc1JGSGswQ1pu?=
 =?utf-8?B?MTRxT2NPNzhIRVBzWktIUDllRGswcVlNZlJhWU51czJQcXE3dTNRSy82dVVj?=
 =?utf-8?B?dzU4RVZtdFNYT0xjTXhkcTdXNENVdUlLVnVvQlBVT2FhcjlmMnVKM25iRHZq?=
 =?utf-8?B?dm5NYWJqNEFQRGNzalNMdVZPUzY0MHFRNXdEYm1EcXFGZ0tiN2FzWmoxL3NR?=
 =?utf-8?B?YU8xdTVGaDhjbm9zeUNKcFNFRGhrc3NTdzFiY2g0bGRqZ3hCT1NQMnY5Qkcw?=
 =?utf-8?B?NXBRL1FHbS83MXRTeStDeFozSU84R3lidUE2RU5samI4M0NlWGxXc1o5T2lD?=
 =?utf-8?B?cTJGYXhZQzg3SW52RmJrRW1RQU9hMkkwQmJOV3dRMzRlSHFIRWxXWDM1d1VQ?=
 =?utf-8?B?RzdsV2V4aGFjZEZXdkpWekJqaW1XNVZwNzV5cE5CME1GOGpYcmxEOVB2T3RP?=
 =?utf-8?B?WlVCWGhOTUJQSEFjenZ1VVlPbHJNTUJpb2UxcFVyNCtDYmZ2R1lwYWxPZjJr?=
 =?utf-8?B?a0NST09vV214Q3piMzZvdHdKVEpCMk9TU01VRmdkeUpKOXFhL0s2UEFSWnBV?=
 =?utf-8?B?d2xadmJkRkNLNUtIN3VJSEpRR04wb3orTnU2aXM0ck4xZm11RWR0UHZlZkpi?=
 =?utf-8?B?VExiSmlZYnFEaUhDQTVzNUdTVGVRN0k2UVA1eFQ4RmZZNlRTeGY4cElneURP?=
 =?utf-8?B?OFllajdiZFNkdmpSSlQ5Q1JmR1FTckgwMFZnMnNLRmJjK0NMVndzZi9kemo3?=
 =?utf-8?B?SE90RGk4cC9Ednk3S1JnVSt1c0YyTWRuNVBOTEZmU3BwajBqR21CNVN6MjZq?=
 =?utf-8?B?eVY3aE1USE54NE8zUkpYUXhVR0dFWjdjV1ZuNnI5SGdaNWdOS0xtRU9xZE0x?=
 =?utf-8?B?QkZFT3lnUW9VTHMrRTlKRXFQdHJjS25HVGtacDl0cmtBVUVSZTNuV3JYTzZH?=
 =?utf-8?B?bkcvMk1mY2lyWHRpZWwwQkhTNHY1a3QraWZsYTRTOTB0U2EzdkRDM3Jicll5?=
 =?utf-8?B?WXJuMVBreTd4NnBpNGEyQ2U5ckFsSlpyS1ZsM2VTUDFGUmpYSWRsMjhNRjRR?=
 =?utf-8?B?ajgzVHpkU2lDbSt2NmpWcFZwTFVKOEV0bUtJQ0hvV3hlZXNCRDZ3VnppemtX?=
 =?utf-8?B?c3hiWWhOZURnR0p1MVdNV3VuZ0FvelorR09CNEhqUFhyMkkzbVVhVUZvYTkr?=
 =?utf-8?B?K0VlV2FBYmx1ZjM1cnM2T0RYcGlmUjFrb0JyRnRIM2VwNDNUMEROdWVLTElt?=
 =?utf-8?B?VTB5amdQMmpZSExBZGV5SkNjUStXSXp5anpLR1piS3R1cjNiQ3U3MVdQODl0?=
 =?utf-8?B?YVE9PQ==?=
X-MS-Exchange-CrossTenant-Network-Message-Id: b6fd0252-c40b-442e-be96-08d99e71efcc
X-MS-Exchange-CrossTenant-AuthSource: SN6PR1501MB2064.namprd15.prod.outlook.com
X-MS-Exchange-CrossTenant-AuthAs: Internal
X-MS-Exchange-CrossTenant-OriginalArrivalTime: 03 Nov 2021 02:30:44.2870
 (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: vBQDzDoY1A7gy6E7bMwVEGl85V+TOJitoRgfjSh/khbPZrqbjqLdZh8hCKpjbexy
X-MS-Exchange-Transport-CrossTenantHeadersStamped: SA0PR15MB4014
X-OriginatorOrg: fb.com
X-Proofpoint-GUID: FbsciHefN2KnCHse6HkesbPzITli76p6
X-Proofpoint-ORIG-GUID: FbsciHefN2KnCHse6HkesbPzITli76p6
X-Proofpoint-Virus-Version: vendor=baseguard
 engine=ICAP:2.0.205,Aquarius:18.0.790,Hydra:6.0.425,FMLib:17.0.607.475
 definitions=2021-11-02_13,2021-11-02_01,2020-04-07_01
X-Proofpoint-Spam-Details: rule=fb_default_notspam policy=fb_default score=0 bulkscore=0
 mlxlogscore=975 adultscore=0 clxscore=1011 priorityscore=1501 spamscore=0
 malwarescore=0 impostorscore=0 phishscore=0 suspectscore=0
 lowpriorityscore=0 mlxscore=0 classifier=spam adjust=0 reason=mlx
 scancount=1 engine=8.12.0-2110150000 definitions=main-2111030012
X-FB-Internal: deliver
Precedence: bulk
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org


On 10/21/21 5:39 AM, Pu Lehui wrote:
> When compiling bpf samples, the following warning appears:
> 
> readelf: Error: Missing knowledge of 32-bit reloc types used in DWARF
> sections of machine number 247
> readelf: Warning: unable to apply unsupported reloc type 10 to section
> .debug_info
> readelf: Warning: unable to apply unsupported reloc type 1 to section
> .debug_info
> readelf: Warning: unable to apply unsupported reloc type 10 to section
> .debug_info
> 
> Same problem was mentioned in commit 2f0921262ba9 ("selftests/bpf:
> suppress readelf stderr when probing for BTF support"), let's use
> readelf that supports btf.
> 
> Signed-off-by: Pu Lehui <pulehui@huawei.com>

Acked-by: Yonghong Song <yhs@fb.com>