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=-3.5 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,URIBL_BLOCKED autolearn=no 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 B3F8CC43461 for ; Tue, 15 Sep 2020 22:44:28 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 7423C20872 for ; Tue, 15 Sep 2020 22:44:28 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="cdGECQNC" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727510AbgIOWoX (ORCPT ); Tue, 15 Sep 2020 18:44:23 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55296 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727208AbgIOWoF (ORCPT ); Tue, 15 Sep 2020 18:44:05 -0400 Received: from mail-qt1-x843.google.com (mail-qt1-x843.google.com [IPv6:2607:f8b0:4864:20::843]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 16E84C06174A for ; Tue, 15 Sep 2020 15:44:05 -0700 (PDT) Received: by mail-qt1-x843.google.com with SMTP id n10so4636349qtv.3 for ; Tue, 15 Sep 2020 15:44:05 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=sender:from:date:to:cc:subject:message-id:references:mime-version :content-disposition:in-reply-to; bh=o79PTdFn/15aj6meTzLNWAkBFe/bmmGLEv7ppsxzM80=; b=cdGECQNCrrDN8kZH2VSjriese1ZZ20Ue7eyj55CPLtQ9PH2mlgbZrViJrAY20VHQBA q9XLD0S6aGgvvfAqzo6KBljF99SmSHZVhTORWc/sa6wX6xRL5Wx5xhKAC0O2tO0xmETI qk8zqZt2AwkTUCtm3gRPv4j5lDizNIDEW3e6VCnoFQaaYdD8K1HYHqO5Dia5WmFag0vw xOZonIcoJTy6hsvgqEmpsFuSTdnNXcb4mfmd9+z9bHog76LHRYjsd9J3VinPlkMdbYnH Bg0SgsgenvRDeo//jVXMo1MXsnZQNtHX7AWlq1IuEhC1xBNDaOYePINrtrLZoVDJMlgT AJNg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:sender:from:date:to:cc:subject:message-id :references:mime-version:content-disposition:in-reply-to; bh=o79PTdFn/15aj6meTzLNWAkBFe/bmmGLEv7ppsxzM80=; b=PGQRNJKQ46w1d6WVrpPF1bRba7g+TWz/fdiUzZM++uaYiopbZ04JoFpL4Ek6mWTcl7 vbLIjoKiPIml1Km9VMgjpcQlSb/xc5GCqpbUaFfKpOM0Z9zmqnwa+L9PUIX/JgD40PtR Z6V6vlsZeX2kOVoAq8++7IvONoZhsKRXSwnbWzZp3/OaQG3fK8bGejcvErj0/XdEY6xM qZYlvNDMSTZke4gXhaktm5MF0U38gp0yi1LSTdsbPOx/7lxtIGeqkHX+/zBryvRCQ+kk MsfXHgQARJlCiy6dFhmSh00D+vsm3BoCrXUUBHjqt+/6edoZLQG+SN6uQJVnb1tK8VB7 8MHw== X-Gm-Message-State: AOAM533ab77UyI1dvGLS7cwieJfgaX0jWeOwd6Fyv/tohwTSuUEZm7Vu X0sR3WdYmrTJ58H7QXmJCLQ= X-Google-Smtp-Source: ABdhPJzLzRAMueKF1IYIStkmOrB6cKfGeVaEu1DpzTlbRXuntpE+nIAixhzKtOxmfN62aZMsVKRARA== X-Received: by 2002:ac8:615d:: with SMTP id d29mr7864123qtm.286.1600209844220; Tue, 15 Sep 2020 15:44:04 -0700 (PDT) Received: from rani.riverdale.lan ([2001:470:1f07:5f3::b55f]) by smtp.gmail.com with ESMTPSA id z74sm18471581qkb.11.2020.09.15.15.44.03 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 15 Sep 2020 15:44:03 -0700 (PDT) From: Arvind Sankar X-Google-Original-From: Arvind Sankar Date: Tue, 15 Sep 2020 18:44:01 -0400 To: Nick Desaulniers Cc: Arvind Sankar , Borislav Petkov , Josh Poimboeuf , Rong Chen , kernel test robot , "Li, Philip" , x86-ml , LKML , clang-built-linux , Marco Elver Subject: Re: [tip:x86/seves] BUILD SUCCESS WITH WARNING e6eb15c9ba3165698488ae5c34920eea20eaa38e Message-ID: <20200915224401.GA1156663@rani.riverdale.lan> References: <5f60c4e0.Ru0MTgSE9A7mqhpG%lkp@intel.com> <20200915135519.GJ14436@zn.tnic> <20200915141816.GC28738@shao2-debian> <20200915160554.GN14436@zn.tnic> <20200915170248.gcv54pvyckteyhk3@treble> <20200915204912.GA14436@zn.tnic> <20200915215054.GA1104608@rani.riverdale.lan> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Sep 15, 2020 at 02:59:19PM -0700, Nick Desaulniers wrote: > On Tue, Sep 15, 2020 at 2:50 PM Arvind Sankar wrote: > > > > On Tue, Sep 15, 2020 at 10:49:12PM +0200, Borislav Petkov wrote: > > > > > > (Btw, clang doesn't need to add that "xor %eax,%eax" - panic() should not be > > > returning, ever. :-)) > > > > > > > I think this is because panic() is varargs, and clang doesn't support > > gcc's -mskip-rax-setup. The normal ABI requires the caller to set RAX to > > the number of arguments in vector registers. > > > > https://patchwork.ozlabs.org/project/gcc/patch/20141218131150.GA32638@intel.com/ > > Thanks for the report. Filed > https://bugs.llvm.org/show_bug.cgi?id=47538. Do you have an account > there Arvind so that I can CC you on them? Nope, no bugzilla account. If you're adding flags, another set the kernel uses is the -falign-{jumps,labels,loops} to turn off alignment of jumps and loops. > > Yikes, it looks like gcc 5.0 supports that. We'd better get to > implementing that lest someone try to remove the cc-option on it soon. > -- > Thanks, > ~Nick Desaulniers