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=-3.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,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 40C15C433E2 for ; Wed, 16 Sep 2020 18:48:54 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D920F20732 for ; Wed, 16 Sep 2020 18:48:53 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=alien8.de header.i=@alien8.de header.b="ejuT2d57" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727830AbgIPSst (ORCPT ); Wed, 16 Sep 2020 14:48:49 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45210 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727956AbgIPSsO (ORCPT ); Wed, 16 Sep 2020 14:48:14 -0400 Received: from mail.skyhub.de (mail.skyhub.de [IPv6:2a01:4f8:190:11c2::b:1457]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 6F1BDC06174A for ; Wed, 16 Sep 2020 11:48:14 -0700 (PDT) Received: from zn.tnic (p200300ec2f0c3e00d1c41ee080a628ee.dip0.t-ipconnect.de [IPv6:2003:ec:2f0c:3e00:d1c4:1ee0:80a6:28ee]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.skyhub.de (SuperMail on ZX Spectrum 128k) with ESMTPSA id D57441EC03A0; Wed, 16 Sep 2020 20:48:12 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=alien8.de; s=dkim; t=1600282093; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=5BUNm3OyFKLbQvPjWFNGky2tnyyTQWNxcWS/uGxVfZE=; b=ejuT2d57ytQMOgMiRxBO3CrANdRM0j9MvgVdMPwWWl9Wbg6kfB/yJVx5ALVfr334OSlnob SBB8PaKEwetjP56Rgjz5NpLqUnqp9JbFlBGOZVH4vPW/iy2j0pRY6PWUKCTMgp4EvUDD8m BaAiq+JcCJH5GGjxprpOz7pvYkH2/YE= Date: Wed, 16 Sep 2020 20:48:04 +0200 From: Borislav Petkov To: Nick Desaulniers Cc: Arvind Sankar , 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: <20200916184804.GS2643@zn.tnic> 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> <20200916113449.GH2643@zn.tnic> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Sep 16, 2020 at 11:28:26AM -0700, Nick Desaulniers wrote: > pt. 3 https://nickdesaulniers.github.io/blog/2014/04/18/lets-write-some-x86-64/ /me adds to the read list. > ...2014, jesus... > > "But you never can tell exactly what the compiler is doing. It doesn’t > always come out the way you want. Like a dusty pane or warped mirror." Fun quote that. The rest is also very entertaining... > Seems I'd learn more about that than I'd could have ever envisioned... Thank there's inline asm. This is also why we don't trust compilers, not even when using builtins. :-P -- Regards/Gruss, Boris. https://people.kernel.org/tglx/notes-about-netiquette