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[217.140.110.172]) by mx.google.com with ESMTP id h20si19770609ejx.253.2019.08.01.05.11.48 for ; Thu, 01 Aug 2019 05:11:48 -0700 (PDT) Received-SPF: pass (google.com: domain of kevin.brodsky@arm.com designates 217.140.110.172 as permitted sender) client-ip=217.140.110.172; Authentication-Results: mx.google.com; spf=pass (google.com: domain of kevin.brodsky@arm.com designates 217.140.110.172 as permitted sender) smtp.mailfrom=kevin.brodsky@arm.com Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id B3A191570; Thu, 1 Aug 2019 05:11:47 -0700 (PDT) Received: from [10.1.194.48] (e123572-lin.cambridge.arm.com [10.1.194.48]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 3A4393F575; Thu, 1 Aug 2019 05:11:42 -0700 (PDT) Subject: Re: [PATCH v19 00/15] arm64: untag user pointers passed to the kernel To: Dave Hansen , Andrey Konovalov , linux-arm-kernel@lists.infradead.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, amd-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org, linux-rdma@vger.kernel.org, linux-media@vger.kernel.org, kvm@vger.kernel.org, linux-kselftest@vger.kernel.org Cc: Catalin Marinas , Vincenzo Frascino , Will Deacon , Mark Rutland , Andrew Morton , Greg Kroah-Hartman , Kees Cook , Yishai Hadas , Felix Kuehling , Alexander Deucher , Christian Koenig , Mauro Carvalho Chehab , Jens Wiklander , Alex Williamson , Leon Romanovsky , Luc Van Oostenryck , Dave Martin , Khalid Aziz , enh , Jason Gunthorpe , Christoph Hellwig , Dmitry Vyukov , Kostya Serebryany , Evgeniy Stepanov , Lee Smith , Ramana Radhakrishnan , Jacob Bramley , Ruben Ayrapetyan , Robin Murphy , Szabolcs Nagy References: <8c618cc9-ae68-9769-c5bb-67f1295abc4e@intel.com> From: Kevin Brodsky Message-ID: <13b4cf53-3ecb-f7e7-b504-d77af15d77aa@arm.com> Date: Thu, 1 Aug 2019 13:11:40 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.8.0 MIME-Version: 1.0 In-Reply-To: <8c618cc9-ae68-9769-c5bb-67f1295abc4e@intel.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit Content-Language: en-GB X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On 31/07/2019 17:50, Dave Hansen wrote: > On 7/23/19 10:58 AM, Andrey Konovalov wrote: >> The mmap and mremap (only new_addr) syscalls do not currently accept >> tagged addresses. Architectures may interpret the tag as a background >> colour for the corresponding vma. > What the heck is a "background colour"? :) Good point, this is some jargon that we started using for MTE, the idea being that the kernel could set a tag value (specified during mmap()) as "background colour" for anonymous pages allocated in that range. Anyway, this patch series is not about MTE. Andrey, for v20 (if any), I think it's best to drop this last sentence to avoid any confusion. Kevin