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[209.132.180.67]) by mx.google.com with ESMTP id j9si9283224pgp.441.2018.04.23.05.33.40; Mon, 23 Apr 2018 05:33:54 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754952AbeDWMbK (ORCPT + 99 others); Mon, 23 Apr 2018 08:31:10 -0400 Received: from gateway21.websitewelcome.com ([192.185.45.95]:36108 "EHLO gateway21.websitewelcome.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754829AbeDWMbI (ORCPT ); Mon, 23 Apr 2018 08:31:08 -0400 Received: from cm17.websitewelcome.com (cm17.websitewelcome.com [100.42.49.20]) by gateway21.websitewelcome.com (Postfix) with ESMTP id 157A5400C5B34 for ; Mon, 23 Apr 2018 07:31:08 -0500 (CDT) Received: from gator4166.hostgator.com ([108.167.133.22]) by cmsmtp with SMTP id AacdfT3G3y2aLAacefpDxg; Mon, 23 Apr 2018 07:31:08 -0500 X-Authority-Reason: nr=8 Received: from [189.145.48.65] (port=55366 helo=[192.168.1.71]) by gator4166.hostgator.com with esmtpsa (TLSv1.2:ECDHE-RSA-AES128-GCM-SHA256:128) (Exim 4.89_1) (envelope-from ) id 1fAacd-004FUw-GB; Mon, 23 Apr 2018 07:31:07 -0500 Subject: Re: Smatch check for Spectre stuff To: Peter Zijlstra , Dan Carpenter Cc: linux-kernel@vger.kernel.org, Ingo Molnar , Thomas Gleixner , dan.j.williams@intel.com, Linus Torvalds References: <20180419051510.GA21898@mwanda> <20180420120044.GN4064@hirez.programming.kicks-ass.net> From: "Gustavo A. R. Silva" Message-ID: Date: Mon, 23 Apr 2018 07:31:03 -0500 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.7.0 MIME-Version: 1.0 In-Reply-To: <20180420120044.GN4064@hirez.programming.kicks-ass.net> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - gator4166.hostgator.com X-AntiAbuse: Original Domain - vger.kernel.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - embeddedor.com X-BWhitelist: no X-Source-IP: 189.145.48.65 X-Source-L: No X-Exim-ID: 1fAacd-004FUw-GB X-Source: X-Source-Args: X-Source-Dir: X-Source-Sender: ([192.168.1.71]) [189.145.48.65]:55366 X-Source-Auth: gustavo@embeddedor.com X-Email-Count: 6 X-Source-Cap: Z3V6aWRpbmU7Z3V6aWRpbmU7Z2F0b3I0MTY2Lmhvc3RnYXRvci5jb20= X-Local-Domain: yes Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Peter, On 04/20/2018 07:00 AM, Peter Zijlstra wrote: > > Hi Dan, > > awesome stuff... > > So I fear that many are actually things we want to fix. Our policy was > to kill the speculation on the first load and not worry if it can be > completed with a dependent load/store. > I wonder if there is any thread where I can read the discussion about that policy that you mention. Could you share it here, please? Thanks -- Gustavo