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=-2.4 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_PASS, USER_AGENT_MUTT autolearn=ham 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 162FFC6786F for ; Sun, 28 Oct 2018 23:06:43 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 2DBF82082D for ; Sun, 28 Oct 2018 23:06:42 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=amarulasolutions.com header.i=@amarulasolutions.com header.b="qP4HHhG2" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 2DBF82082D Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=amarulasolutions.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727667AbeJ2Hwn (ORCPT ); Mon, 29 Oct 2018 03:52:43 -0400 Received: from mail-ed1-f47.google.com ([209.85.208.47]:37273 "EHLO mail-ed1-f47.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726858AbeJ2Hwn (ORCPT ); Mon, 29 Oct 2018 03:52:43 -0400 Received: by mail-ed1-f47.google.com with SMTP id u12-v6so2846177eds.4 for ; Sun, 28 Oct 2018 16:06:37 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=amarulasolutions.com; s=google; h=date:from:to:cc:subject:message-id:mime-version:content-disposition :user-agent; bh=WwrqBidUGUlRgvK+K4Nts80VLeQFsRh+pg19z4w06tg=; b=qP4HHhG2FLJvhPJMeXhYm2hFJqBtAXgGE7CowSZjbUF5YZTQESExfjXW83cIwo1Y9H WLRhRRlXtcn9WlQ5Bvtj+PWuTN2PH35Dxz3Gpwx1rBuNCaNHIVtDoPaRXuHt6yQ5+LYa ntJgcNloHamICNz+2B/6L5MlX2jQ5MinSawMk= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:mime-version :content-disposition:user-agent; bh=WwrqBidUGUlRgvK+K4Nts80VLeQFsRh+pg19z4w06tg=; b=AY5bWpsM6vPSLjcGcuMPGwV464kDQy77GahydIymj47DNLKs89qrDLevkn+YmztvVk W7n+at6NKzKlbmW/H1Z9L86FklodlKCwjsujo4PCFiQd9P9cqIwpXo6nFgxu9YPRukT8 2xonKuOsiWEXdJCvMKYIfWLWHFanD0R1aurr1N3mrsicj9BBy04aoDt3OecdvK1OCEwB AIHEsV9o7atjp/hJ/sBBFGpOjt225IatwHwgcjskd7ZPUcHo2nglzjF/u6nLA7wD3qHV qA1C6r6CIt+IJxl8/QDSMzpRuSP1NHtt5Il2X5YCV4pSpDW7dUXNNLayowVg+DsRZ6Er A7vg== X-Gm-Message-State: AGRZ1gLn8ZcS1HO6M7TsO7OxDdyy0S+Bqpj9tNumAbRP4sv2x1L/xiwl Rto9OZet4Z0YdWnleZOKd+xRT0rjvOmMQw== X-Google-Smtp-Source: AJdET5cI6mSUqrC9jaeRatNys8sni5Py/I9HvER/of4gZ0h+lvQVaLgWu7jnJKn254T3ebkCLjThcw== X-Received: by 2002:a50:b7b7:: with SMTP id h52-v6mr11695018ede.17.1540767996293; Sun, 28 Oct 2018 16:06:36 -0700 (PDT) Received: from andrea (15.152.230.94.awnet.cz. [94.230.152.15]) by smtp.gmail.com with ESMTPSA id h3-v6sm6221632ede.42.2018.10.28.16.06.35 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Sun, 28 Oct 2018 16:06:35 -0700 (PDT) Date: Mon, 29 Oct 2018 00:06:27 +0100 From: Andrea Parri To: "Paul E. McKenney" , Peter Zijlstra , Josh Triplett Cc: linux-kernel@vger.kernel.org Subject: [RFR] Store tearing Message-ID: <20181028230627.GA3420@andrea> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.9.4 (2018-02-28) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi, memory-barriers.txt says: [on "store tearing"] "In fact, a recent bug (since fixed) caused GCC to incorrectly use this optimization in a volatile store.". I was wondering if you could help me retrieve some reference/discussions about this? Thanks, Andrea