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=-0.9 required=3.0 tests=DKIMWL_WL_HIGH,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 319C4C43331 for ; Tue, 12 Nov 2019 18:39:23 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 06A65214E0 for ; Tue, 12 Nov 2019 18:39:23 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1573583963; bh=7jI3zxoAk5wueaZfUenBjnVXpiZ4XEKIs1A3JC1BJw4=; h=References:In-Reply-To:From:Date:Subject:To:Cc:List-ID:From; b=EUJWwMKQX92idpygcjsCepIvgZBbwL2y0N/Q4xcQOi1qITqFODWTZsLBz96o805Op WXeh7A3wScArleQ83bPSIGWRUG4Fez0kbQD7whqfkN6DEg/qPTGIikupDMN9ubosze Ma0h2idSaHEY//3PZk1raT0uVGXl6rAZeutjYWtw= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727548AbfKLSjV (ORCPT ); Tue, 12 Nov 2019 13:39:21 -0500 Received: from mail-lf1-f65.google.com ([209.85.167.65]:41929 "EHLO mail-lf1-f65.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726959AbfKLSjV (ORCPT ); Tue, 12 Nov 2019 13:39:21 -0500 Received: by mail-lf1-f65.google.com with SMTP id j14so13688944lfb.8 for ; Tue, 12 Nov 2019 10:39:20 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux-foundation.org; s=google; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=l3/5+bE6a1aacx1NneO4G1AEtvlCm22h7I0IfvLwDdM=; b=h3mM4K7MdjNYkyyzw74cY6LaurZbZ0BediutdB4c6fnjSAaQMB7XKmFEa5BbJrTmYb W6T4IjafBbff7661PiiuiCIe9bisVOI9/hAmlYrc0kKmZj7XcOeYLAvCMUsoi5361Lk9 Z01vkoYEoBTtnFMw6CbLvLjcmlO6+fvnSkTpc= 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=l3/5+bE6a1aacx1NneO4G1AEtvlCm22h7I0IfvLwDdM=; b=NbQYIj9ni7Iy++fU7dK1XD0lueD4SOZL+YqwE8kR5sKAq7+rIgiHa4gmFR+VjCpSgc NlAB2LWEl+gdpUPhck0WsIGSVjD56ROrf7aXk93nLHB0YQG1bBRuX4uxrqDrXxNJxoLX vpvjtZYm0npT/KeAMp3HDRE7H2kbe3nkE7m4XLE1SwUTCpXlu0VWQvqQBUvGI52rumaE +JqN22Ie4i5BrcvrJHZfLBkNhmLEGsEV7PGaC+kCl9xAd2O2veLUC0BZ40ujTV/B1yI6 hfWSwE/KIaCv4dzj97hBRWS5y8rDD1wiZm1LqdFOV8muuyOfvqdcGWxsOK7lm7VeSSSX rptA== X-Gm-Message-State: APjAAAWRm/1lt6LFGPELve6RlPOX9T/cmhM8ifQvYetLTmMBAq2IpjSK kWFrHv78XZ/k61nM8bPYy73l7Qaw95U= X-Google-Smtp-Source: APXvYqzuH95GDXEpXH/Z/+f6yR798WqsOTG0/eS0nnanXtl/nrvdPOFkkd/F3iMIpG5lTNHm8Tv/3w== X-Received: by 2002:ac2:5b47:: with SMTP id i7mr20390937lfp.82.1573583958877; Tue, 12 Nov 2019 10:39:18 -0800 (PST) Received: from mail-lj1-f177.google.com (mail-lj1-f177.google.com. [209.85.208.177]) by smtp.gmail.com with ESMTPSA id x19sm6349144ljh.14.2019.11.12.10.39.17 for (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 12 Nov 2019 10:39:18 -0800 (PST) Received: by mail-lj1-f177.google.com with SMTP id g3so18940442ljl.11 for ; Tue, 12 Nov 2019 10:39:17 -0800 (PST) X-Received: by 2002:a2e:8919:: with SMTP id d25mr21258377lji.97.1573583957672; Tue, 12 Nov 2019 10:39:17 -0800 (PST) MIME-Version: 1.0 References: <20191112130244.16630-1-vincent.whitchurch@axis.com> <20191112160855.GA22025@arrakis.emea.arm.com> <20191112180034.GB19889@willie-the-truck> <20191112182249.GB22025@arrakis.emea.arm.com> In-Reply-To: <20191112182249.GB22025@arrakis.emea.arm.com> From: Linus Torvalds Date: Tue, 12 Nov 2019 10:39:01 -0800 X-Gmail-Original-Message-ID: Message-ID: Subject: Re: [PATCH v2] buffer: Fix I/O error due to ARM read-after-read hazard To: Catalin Marinas Cc: Will Deacon , Vincent Whitchurch , Jens Axboe , Russell King - ARM Linux , Linux Kernel Mailing List , Linux ARM , Vincent Whitchurch , Richard Earnshaw 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, Nov 12, 2019 at 10:22 AM Catalin Marinas wrote: > > OK, so this includes changing test_bit() to perform a READ_ONCE. That's not going to happen. Linus