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=-11.4 required=3.0 tests=BAYES_00,DKIMWL_WL_MED, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_IN_DEF_DKIM_WL 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 4502EC43461 for ; Tue, 15 Sep 2020 22:03:04 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 0B1A5206B7 for ; Tue, 15 Sep 2020 22:03:03 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="cHEsQkyA" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728115AbgIOWDB (ORCPT ); Tue, 15 Sep 2020 18:03:01 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:48428 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728078AbgIOV7h (ORCPT ); Tue, 15 Sep 2020 17:59:37 -0400 Received: from mail-pg1-x535.google.com (mail-pg1-x535.google.com [IPv6:2607:f8b0:4864:20::535]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 8FF8AC06174A for ; Tue, 15 Sep 2020 14:59:35 -0700 (PDT) Received: by mail-pg1-x535.google.com with SMTP id y1so2707781pgk.8 for ; Tue, 15 Sep 2020 14:59:35 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=YF93KykULk2q5SO2dhkeGC6nTzzjF1T7ZBcBgWuMdD0=; b=cHEsQkyAuZtJJ4kGL2oYhkKlwgH11p9PW3+MSR4L0+qFRHnHrOeU8s2p6lY+R86R/0 K8xG5B9HM9dfH+e1s0VDYhl5WR9fDhxFg2mJAEwjBozXAN5ZJkxdoV6CUhKne0E9uU1P vZF1pSuwtdEVL5w7Igca4OP/XWOWsxGCrM5KqBBoCfoLkreXEfvYg/1i8RU7p6uDVyj9 QTZVOvHAVBFEhoCJBidp6OXmNoGedNiQvJAzYIgA8t/cT9DeFtYDkANx+cgkDxjFhRX+ aPLtNOLB/oVIX1wSm8i8PrWWGEg2Tu+Y5EdmBss1LE2HjpRkUHhKbK0LpssHYoEhuScI E7eg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=YF93KykULk2q5SO2dhkeGC6nTzzjF1T7ZBcBgWuMdD0=; b=L31fZKJqJSM5ZGKxLphAtE1OTlGKk/CnwhdiKXfkk9eTcbIb6b8ZqOajeMMjQ1I/Ci OKJ0OLjhD6s3KIS1SC5vef6X+B8wE1hv4vq6Pxi1ZCIC4nOK1F2HrC1BjLrVxDXH3RLz bz5n+S6S+2+Ni/sHbV1OvCdJdkLvGv9IbdmeqqXlhy7GazIgLQtzb/9+XTii3fd1dXrY 2SlWPV3KGv7HdJYw0yPbapbFVPogD4KwSDH6ADkbyBUCuBldu6Uqw3r85Ajx/IhsT2s7 hgyNjVevFshlrOyl9lwav1mXshirqM80+J+ugHXRQx5plPgnU1n4vknap4sTrvzLT9EL e1bw== X-Gm-Message-State: AOAM531stq8azYza97qhRo8Sw4kLjMIyfEZwpt0K+iw8G8HapYI3yoH+ SZh4ega9ihp3vxyFXXSjNXcAJviFUAOxz0NYY6woxw== X-Google-Smtp-Source: ABdhPJxUgCPGqirdbzsiBzK4MwmxJlpiKLnjXqMbGwpbWfpMrcWY+3ISOHKsezeVobinH8svOjX9QkMseQ8aET62foU= X-Received: by 2002:a63:31d2:: with SMTP id x201mr16686038pgx.263.1600207172344; Tue, 15 Sep 2020 14:59:32 -0700 (PDT) MIME-Version: 1.0 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> In-Reply-To: <20200915215054.GA1104608@rani.riverdale.lan> From: Nick Desaulniers Date: Tue, 15 Sep 2020 14:59:19 -0700 Message-ID: Subject: Re: [tip:x86/seves] BUILD SUCCESS WITH WARNING e6eb15c9ba3165698488ae5c34920eea20eaa38e To: Arvind Sankar Cc: Borislav Petkov , Josh Poimboeuf , Rong Chen , kernel test robot , "Li, Philip" , x86-ml , LKML , clang-built-linux , Marco Elver Content-Type: text/plain; charset="UTF-8" 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 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? 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