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 X-Spam-Level: X-Spam-Status: No, score=-7.5 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING,SPF_HELO_NONE,SPF_PASS, USER_AGENT_MUTT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id D0A76C282CE for ; Wed, 22 May 2019 14:12:01 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id AFA702173C for ; Wed, 22 May 2019 14:12:01 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728693AbfEVOMA (ORCPT ); Wed, 22 May 2019 10:12:00 -0400 Received: from mga09.intel.com ([134.134.136.24]:55169 "EHLO mga09.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726770AbfEVOMA (ORCPT ); Wed, 22 May 2019 10:12:00 -0400 X-Amp-Result: UNSCANNABLE X-Amp-File-Uploaded: False Received: from orsmga004.jf.intel.com ([10.7.209.38]) by orsmga102.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 22 May 2019 07:11:59 -0700 X-ExtLoop1: 1 Received: from shao2-debian.sh.intel.com (HELO localhost) ([10.239.13.6]) by orsmga004.jf.intel.com with ESMTP; 22 May 2019 07:11:58 -0700 Date: Wed, 22 May 2019 22:12:18 +0800 From: kernel test robot To: Andrey Ryabinin Cc: Linus Torvalds , LKML , lkp@01.org Subject: Re: [ubsan] f0996bc297: netperf.Throughput_total_tps -7.6% regression Message-ID: <20190522141218.GI19312@shao2-debian> References: <20190520053851.GY31424@shao2-debian> <4834add1-711e-b441-1956-1ab2b2d89353@virtuozzo.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <4834add1-711e-b441-1956-1ab2b2d89353@virtuozzo.com> User-Agent: Mutt/1.10.1 (2018-07-13) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, May 20, 2019 at 12:50:30PM +0300, Andrey Ryabinin wrote: > > > On 5/20/19 8:38 AM, kernel test robot wrote: > > Greeting, > > > > FYI, we noticed a -7.6% regression of netperf.Throughput_total_tps due to commit: > > > > > > commit: f0996bc2978e02d2ea898101462b960f6119b18f ("ubsan: Fix nasty -Wbuiltin-declaration-mismatch GCC-9 warnings") > > https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git master > > > > This can't be right. First of all the commit makes changes only lib/ubsan.c which is compiled only when CONFIG_UBSAN=y. > In your config: > # CONFIG_UBSAN is not set > > But even in the case of enabled UBSAN that commit doesn't change the generated machine code at all. Hi, Sorry for bringing you inconvenience. We retested the commit and couldn't reproduce the regression, please ignore the invalid report. Best Regards, Rong Chen