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Fri, 17 Jan 2025 10:44:09 +0000 Received: from LV8PR10MB7822.namprd10.prod.outlook.com ([fe80::4808:df01:d7ce:3c1e]) by LV8PR10MB7822.namprd10.prod.outlook.com ([fe80::4808:df01:d7ce:3c1e%4]) with mapi id 15.20.8356.014; Fri, 17 Jan 2025 10:44:08 +0000 From: "Jose E. Marchesi" To: Ihor Solodrai Cc: Andrew Pinski via Gcc , bpf , Cupertino Miranda , Alexei Starovoitov , Andrii Nakryiko , Manu Bretelle , Eduard Zingerman , Mykola Lysenko , Yonghong Song , David Faust , Andrew Pinski , Yonghong Song Subject: Re: Announcement: GCC BPF is now being tested on BPF CI In-Reply-To: <8zWDbpQS-9sjNHlLlLHFNncS_8_Tl0clkrX-Jst-1FeRJWHWYpPQe9DLdKTQwfPoLX8Grb0tB-714dcMOFsdTRBd0-ZcYwpkqe-HgGXkenc=@pm.me> (Ihor Solodrai's message of "Fri, 17 Jan 2025 03:32:36 +0000") References: <87bjw6qpje.fsf@oracle.com> <8zWDbpQS-9sjNHlLlLHFNncS_8_Tl0clkrX-Jst-1FeRJWHWYpPQe9DLdKTQwfPoLX8Grb0tB-714dcMOFsdTRBd0-ZcYwpkqe-HgGXkenc=@pm.me> Date: Fri, 17 Jan 2025 11:44:04 +0100 Message-ID: <87ldv9k9e3.fsf@oracle.com> User-Agent: Gnus/5.13 (Gnus v5.13) Content-Type: text/plain X-ClientProxiedBy: LO4P265CA0310.GBRP265.PROD.OUTLOOK.COM (2603:10a6:600:391::18) To LV8PR10MB7822.namprd10.prod.outlook.com (2603:10b6:408:1e8::6) Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: LV8PR10MB7822:EE_|PH0PR10MB5895:EE_ X-MS-Office365-Filtering-Correlation-Id: ac10c332-e71f-4d5a-e20a-08dd36e3df2c X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|7416014|1800799024|376014|366016; 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Marchesi wrote: > >> >> [...] >> > > >> > > Effective BPF selftests denylist for GCC BPF is located here: >> > > https://github.com/kernel-patches/vmtest/blob/master/ci/vmtest/configs/DENYLIST.test_progs-bpf_gcc >> > >> > The announcement triggered an off-list discussion among BPF devs about >> > how to handle the test running, given the long denylist. >> > >> > The problem is that any new test is now a potential subject to >> > debugging whether the test needs changes, or GCC doesn't work for it. >> > >> > As of now, an important missing piece on GCC side is the decl_tags >> > support, as they are heavily used by BPF selftests. See a message from >> > Yonghong Song: >> > https://gcc.gnu.org/pipermail/gcc-patches/2025-January/673841.html >> > >> > Some discussed suggestions: >> > * Run test_progs-bpf_gcc with "allowed to fail", so that the >> > pipeline is never blocked >> > * Only run GCC BPF compilation, and don't execute the tests >> >> >> I think that this is the best solution for now, and the most useful. >> >> As soon as we achieve passing all the selftests (hopefully soon) then we >> can change the CI to flag regressions on test run failures as well. > > Ok. I disabled the execution of the test_progs-bpf_gcc test runner for now. > > I think we should check on the state of the tests again after decl_tags > support is landed. Thank you. Sounds like a plan :) Is it possible to configure the CI to send an email to certain recipients when the build of the selftests with GCC fails? That would help us to keep an eye on the patches and either fix GCC or provide advise on how to fix the selftest in case it contains bad C. > > Thanks. > >> >> > * Flip denylist to allowlist to prevent regressions, but not force >> > new tests to work with GCC >> > >> > Input from GCC devs will be much appreciated. >> > >> > Thanks. >> > >> > > When a patch is submitted to BPF, normally a corresponding PR for >> > > kernel-patches/bpf github repo is automatically created to trigger a >> > > BPF CI run for this change. PRs opened manually will do that too, and >> > > this can be used to test patches before submission. >> > > >> > > Since the CI automatically pulls latest GCC snapshot, a change in GCC >> > > can potentially cause CI failures unrelated to Linux changes being >> > > tested. This is not the only dependency like that, of course. >> > > >> > > In such situations, a change is usually made in CI code to mitigate >> > > the failure in order to unblock the pipeline for patches. If that >> > > happens with GCC, someone (most likely me) will have to reach out to >> > > GCC team. I guess gcc@gcc.gnu.org would be the default point of >> > > contact, but if there are specific people who should be notified >> > > please let me know.