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[217.140.110.172]) by mx.google.com with ESMTP id u58si3826049edm.309.2019.06.10.07.28.36 for ; Mon, 10 Jun 2019 07:28:36 -0700 (PDT) Received-SPF: pass (google.com: domain of catalin.marinas@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 catalin.marinas@arm.com designates 217.140.110.172 as permitted sender) smtp.mailfrom=catalin.marinas@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 A6C8A344; Mon, 10 Jun 2019 07:28:35 -0700 (PDT) Received: from c02tf0j2hf1t.cambridge.arm.com (c02tf0j2hf1t.cambridge.arm.com [10.1.32.192]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id AF14A3F73C; Mon, 10 Jun 2019 07:28:27 -0700 (PDT) Date: Mon, 10 Jun 2019 15:28:25 +0100 From: Catalin Marinas To: Andrey Konovalov Cc: 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, 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 , Kevin Brodsky , Szabolcs Nagy Subject: Re: [PATCH v16 05/16] arm64: untag user pointers passed to memory syscalls Message-ID: <20190610142824.GB10165@c02tf0j2hf1t.cambridge.arm.com> References: <045a94326401693e015bf80c444a4d946a5c68ed.1559580831.git.andreyknvl@google.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <045a94326401693e015bf80c444a4d946a5c68ed.1559580831.git.andreyknvl@google.com> User-Agent: Mutt/1.11.2 (2019-01-07) 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 Mon, Jun 03, 2019 at 06:55:07PM +0200, Andrey Konovalov wrote: > This patch is a part of a series that extends arm64 kernel ABI to allow to > pass tagged user pointers (with the top byte set to something else other > than 0x00) as syscall arguments. > > This patch allows tagged pointers to be passed to the following memory > syscalls: get_mempolicy, madvise, mbind, mincore, mlock, mlock2, mprotect, > mremap, msync, munlock. > > Signed-off-by: Andrey Konovalov I would add in the commit log (and possibly in the code with a comment) that mremap() and mmap() do not currently accept tagged hint addresses. Architectures may interpret the hint tag as a background colour for the corresponding vma. With this: Reviewed-by: Catalin Marinas -- Catalin