From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 238F9C433EF for ; Thu, 14 Oct 2021 13:09:13 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 0274760EDF for ; Thu, 14 Oct 2021 13:09:12 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231233AbhJNNLQ (ORCPT ); Thu, 14 Oct 2021 09:11:16 -0400 Received: from mail.efficios.com ([167.114.26.124]:38488 "EHLO mail.efficios.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230054AbhJNNLP (ORCPT ); Thu, 14 Oct 2021 09:11:15 -0400 Received: from localhost (localhost [127.0.0.1]) by mail.efficios.com (Postfix) with ESMTP id 6AB9038D1FE; Thu, 14 Oct 2021 09:09:10 -0400 (EDT) Received: from mail.efficios.com ([127.0.0.1]) by localhost (mail03.efficios.com [127.0.0.1]) (amavisd-new, port 10032) with ESMTP id SX16T8nkSvtc; Thu, 14 Oct 2021 09:09:10 -0400 (EDT) Received: from localhost (localhost [127.0.0.1]) by mail.efficios.com (Postfix) with ESMTP id 052F338D537; Thu, 14 Oct 2021 09:09:10 -0400 (EDT) DKIM-Filter: OpenDKIM Filter v2.10.3 mail.efficios.com 052F338D537 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=efficios.com; s=default; t=1634216950; bh=QA5iHLT0xwd7pVtVi/ntg/zo6PLr+nWTvEpxMyu1hng=; h=Date:From:To:Message-ID:MIME-Version; b=ZNyuPokd1KuOJ5jlCLDEq/XeO+LNqz7ZshGVK/CIqeNtpAD65eFVlNz5lMM85zqBE AaYF83xWCeqMhazswL1USzn3Hc6R04xjraNNUDZqDNdAfG4ZhWukhZoznNAYRgYgWU spkqf0ilD0YRHWz7VWCqLt/PMCrfGLZiimXk9PlMfmOIxu7dGs+rB3jJqd7mjpVqNt SGUFHeBRlFRRL305EHoCbiwi1bkjooRmUqehZHyaboUVitUVADQmNX6F6mNfXE80r3 rUWywaSIaFM/82XoL65Qvd/YvX0VS3vY8iQjFAq65TOsCXIyVD0+vR7PtSutpbvNMR MDcSL/notZA7g== X-Virus-Scanned: amavisd-new at efficios.com Received: from mail.efficios.com ([127.0.0.1]) by localhost (mail03.efficios.com [127.0.0.1]) (amavisd-new, port 10026) with ESMTP id MvqFsZP8MAyP; Thu, 14 Oct 2021 09:09:09 -0400 (EDT) Received: from mail03.efficios.com (mail03.efficios.com [167.114.26.124]) by mail.efficios.com (Postfix) with ESMTP id DCA6A38D49D; Thu, 14 Oct 2021 09:09:09 -0400 (EDT) Date: Thu, 14 Oct 2021 09:09:09 -0400 (EDT) From: Mathieu Desnoyers To: Yafang Shao Cc: acme , rostedt , kernel test robot , 0day robot , Petr Mladek , Kees Cook , Peter Zijlstra , Alexander Viro , linux-kernel , lkp , Andrew Morton , Valentin Schneider , Qiang Zhang , robdclark , christian , Dietmar Eggemann , Ingo Molnar , Juri Lelli , Vincent Guittot , Ben Segall , Mel Gorman , bristot , aubrey li , yu c chen Message-ID: <173454728.14036.1634216949862.JavaMail.zimbra@efficios.com> In-Reply-To: References: <20211010102429.99577-4-laoar.shao@gmail.com> <20211014072707.GA18719@xsang-OptiPlex-9020> <1529739526.13983.1634215325995.JavaMail.zimbra@efficios.com> Subject: Re: [sched.h] 317419b91e: perf-sanity-tests.Parse_sched_tracepoints_fields.fail MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit X-Originating-IP: [167.114.26.124] X-Mailer: Zimbra 8.8.15_GA_4156 (ZimbraWebClient - FF93 (Linux)/8.8.15_GA_4156) Thread-Topic: 317419b91e: perf-sanity-tests.Parse_sched_tracepoints_fields.fail Thread-Index: IUaqGI45KnV+Wu7moWF2apb54rkhyQ== Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org ----- On Oct 14, 2021, at 9:05 AM, Yafang Shao laoar.shao@gmail.com wrote: [...] >> If it happens that this ABI break is noticed by more than an in-tree test >> program, then >> the kernel's ABI rules will require that this trace field size stays unchanged. >> This brings >> up once more the whole topic of "Tracepoints ABI" which has been discussed >> repeatedly in >> the past. >> > > I will check if any other in-tree tools depends on TASK_COMM_LEN. That's a start, but given this is a userspace ABI, out-of-tree userland tools which depend of this to be fixed-size are also relevant. Thanks, Mathieu -- Mathieu Desnoyers EfficiOS Inc. http://www.efficios.com