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 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 D02CBC1975A for ; Wed, 25 Mar 2020 17:34:00 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 9FC9A20740 for ; Wed, 25 Mar 2020 17:34:00 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1585157640; bh=3fg2Yohv9dythB7jKJDFlSo727WVCnU7vtMwI65RnbY=; h=References:In-Reply-To:From:Date:Subject:To:Cc:List-ID:From; b=FCXUWStCveoMN1io35dyPK0/xu9jMDD/QpwHYeHJ6fqvk+RqeQTY3vAOXwYoMTMpF M70IQ6tBlxmps5lCPfeH0CWFJ5IHqDpdPgO2xBbZptYLebbmMtButABxgo2ia7S5Jx RfUL1Nq4Lg17/5CAPPMZoSg3l9jnCA0adgXwLKUQ= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727733AbgCYRd7 (ORCPT ); Wed, 25 Mar 2020 13:33:59 -0400 Received: from mail-lf1-f68.google.com ([209.85.167.68]:45259 "EHLO mail-lf1-f68.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727129AbgCYRd7 (ORCPT ); Wed, 25 Mar 2020 13:33:59 -0400 Received: by mail-lf1-f68.google.com with SMTP id v4so2488321lfo.12 for ; Wed, 25 Mar 2020 10:33:57 -0700 (PDT) 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=WD9sJ7e0VtDn+ggzAl5BJdUvSH4xHuF+tQFUtVO3ypE=; b=WGZT23GW3l1IUkI7B+xGcDt5rMqhhi90Mt39Ps79pv2c3a8o2pdcaPJk3WEzm7iMag 4GyBo7pyJ0/uI2VvnGfWdYXgj4wXPU+3x6UoAr4UZYQKI8253uLtZshqu0KsCeSb0lQU 0fQ5OqX98L/OxmrWufaXldfncoyLhcc3w3DhA= 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=WD9sJ7e0VtDn+ggzAl5BJdUvSH4xHuF+tQFUtVO3ypE=; b=iiivyq54gSTtj/VuRkcNzz04lwcbAySw6KKWJwDFi3HTQFdOOu1zPkPHPAndK/9dYf wZvIkL4CZAV+yvjeRQstJt3tac8BUTonfycTCZNlVrb706UZwCw9dkLEj8uGyDoMAm9/ zgfQqYhz/i0vl3PYWuV/RexBy6I+MZ+tVu+UpIq/i6oJUkbt5wGidrArV7hg5QnjGWlH 8t5X/FXMRgJeiQUkhLF+0mcB+hTDcnP9dproKN6cKJ1c8dZAustGoNUvdRc8+fy8F4vJ J9PcR9lG4rbgVqb1oBSGqRApncuakSKGJN6KTl+JDorv1UkTzfqfU4aDI3SyM75cgWQK 9AmA== X-Gm-Message-State: ANhLgQ2QfYfxF7VlV11Jf6TGP+tMZ6LLPI+JpJWhygnhcrr4oRbZcoFG tov+kIbV+uz6ut+LbtemEwbZMElnzwE= X-Google-Smtp-Source: ADFU+vsvthX6324bFaZ9ii+Rtyi6YWeLk3UX1dkjCJk3JbZigVGshIOkUj5Ro5M7gO8EZuoDmf1Y/w== X-Received: by 2002:a19:2203:: with SMTP id i3mr2968145lfi.120.1585157636544; Wed, 25 Mar 2020 10:33:56 -0700 (PDT) Received: from mail-lj1-f175.google.com (mail-lj1-f175.google.com. [209.85.208.175]) by smtp.gmail.com with ESMTPSA id g5sm9083023lfd.66.2020.03.25.10.33.55 for (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 25 Mar 2020 10:33:55 -0700 (PDT) Received: by mail-lj1-f175.google.com with SMTP id k21so3424386ljh.2 for ; Wed, 25 Mar 2020 10:33:55 -0700 (PDT) X-Received: by 2002:a2e:a58e:: with SMTP id m14mr2579577ljp.204.1585157635185; Wed, 25 Mar 2020 10:33:55 -0700 (PDT) MIME-Version: 1.0 References: <20200325111347.32553-1-will@kernel.org> In-Reply-To: <20200325111347.32553-1-will@kernel.org> From: Linus Torvalds Date: Wed, 25 Mar 2020 10:33:39 -0700 X-Gmail-Original-Message-ID: Message-ID: Subject: Re: [PATCH] mm/mremap: Add comment explaining the untagging behaviour of mremap() To: Will Deacon Cc: Linux Kernel Mailing List , Linux ARM , Android Kernel Team , Catalin Marinas 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 Wed, Mar 25, 2020 at 4:13 AM Will Deacon wrote: > > Add a comment justifying the untagging behaviour in mremap(). Ack. This makes that odd "do it on one address, not the other" thing clear. Otherwise I bet somebody would come along in a few years and go "Oh, people missed that other case". Linus