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=-2.6 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_AGENT_SANE_1 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 8B781C4BA0A for ; Wed, 26 Feb 2020 05:52:57 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 6030A206E2 for ; Wed, 26 Feb 2020 05:52:57 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1582696377; bh=LXtzpAjFHsoSDjIzYCnsM4n2Ozw7UhiECfuzlGEBkeM=; h=Subject:To:Cc:References:From:Date:In-Reply-To:List-ID:From; b=d2vkmwoBvJINGaKHbe1fb8lace5LhpWnTWDGnfdB9Q3IwsDdLnrKJZ4Y+puBFcndX UDOq2wOJ4VeYA20JDl09eQHThFnrUF959fXJUvXTF0b/Fo12k5vkK6PN+jlJGUoajO 8pajVQgS6JDhCufAfL3hleTExZ3ermHbipY37kfU= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727124AbgBZFw4 (ORCPT ); Wed, 26 Feb 2020 00:52:56 -0500 Received: from mail-pl1-f178.google.com ([209.85.214.178]:38338 "EHLO mail-pl1-f178.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725789AbgBZFw4 (ORCPT ); Wed, 26 Feb 2020 00:52:56 -0500 Received: by mail-pl1-f178.google.com with SMTP id p7so841982pli.5 for ; Tue, 25 Feb 2020 21:52:54 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:to:cc:references:from:message-id:date :user-agent:mime-version:in-reply-to:content-language :content-transfer-encoding; bh=q7dd9D80AknbXye8Q0duvJLPoxMkHrjXWUkrMD4f8ks=; b=eeQFPLKZ99cNo4wsxrSQMDImFQHRTSeFakVFi4xHFSpJsPD1zX+5XJ4KravBOUiPWs pehXhH/T6C+LeYMv8qyHFT+8HIOLMSztkr2+Kgx5E43rcUYBpxSiWSycXLElFTiFjYWU HWMkeCgVqJ3ABGeKw4PD6by/e8EwZM96P50b7dodKSRt6KdIiBmhZxQvhtctYCeq/rnl v5FKNTnFkMNranG8f7OnEUX8dJlV59mXigOedk2BuEGDJ/rL3h/HJ3AT5RZWRUQuCSZW FzadbRgKQzGvG+78XAFB52O9ZyXcgvTnSbwIhox/LxaHO+QGf90aQpT4tFqzK5IHZDFN l2vw== X-Gm-Message-State: APjAAAVl+dahnzb0/sRcPhzSyhIMcRdjtEWFCY4W18kYLnld5MLJ2neq GpFpH+v2I2YsZcAa6W+Z6iBrhg== X-Google-Smtp-Source: APXvYqzDiwFWIpGr05IT190wohMrGLsODtTuDGp8sPwiiFq2qYS0WJQL2DJSQ6U1d4PdsWDeNd/TFQ== X-Received: by 2002:a17:90a:7d07:: with SMTP id g7mr3328576pjl.17.1582696373638; Tue, 25 Feb 2020 21:52:53 -0800 (PST) Received: from ?IPv6:2601:646:c200:1ef2:3602:86ff:fef6:e86b? ([2601:646:c200:1ef2:3602:86ff:fef6:e86b]) by smtp.googlemail.com with ESMTPSA id o6sm938967pgg.37.2020.02.25.21.52.52 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 25 Feb 2020 21:52:53 -0800 (PST) Subject: Re: [patch 02/24] x86/entry/64: Avoid pointless code when CONTEXT_TRACKING=n To: Thomas Gleixner , LKML Cc: x86@kernel.org, Steven Rostedt , Brian Gerst , Juergen Gross , Paolo Bonzini , Arnd Bergmann References: <20200225221606.511535280@linutronix.de> <20200225222648.395059616@linutronix.de> From: Andy Lutomirski Message-ID: <4ef1253a-1572-d523-3e78-2fe2e579b4ca@kernel.org> Date: Tue, 25 Feb 2020 21:52:51 -0800 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.5.0 MIME-Version: 1.0 In-Reply-To: <20200225222648.395059616@linutronix.de> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 2/25/20 2:16 PM, Thomas Gleixner wrote: > GAS cannot optimize out the test and conditional jump when context tracking > is disabled and CALL_enter_from_user_mode is an empty macro. > > Wrap it in #ifdeffery. Will go away once all this is moved to C. Acked-by: Andy Lutomirski