From mboxrd@z Thu Jan  1 00:00:00 1970
From: Kees Cook <keescook@chromium.org>
Subject: Re: [PATCH v16 13/16] media/v4l2-core, arm64: untag user pointers in
 videobuf_dma_contig_user_get
Date: Fri, 7 Jun 2019 20:52:45 -0700
Message-ID: <201906072052.077135B@keescook>
References: <cover.1559580831.git.andreyknvl@google.com>
 <31821f3538ddacb7e57e0248e86a3d28f9789d2f.1559580831.git.andreyknvl@google.com>
Mime-Version: 1.0
Content-Type: text/plain; charset="utf-8"
Content-Transfer-Encoding: base64
Return-path: <dri-devel-bounces@lists.freedesktop.org>
Content-Disposition: inline
In-Reply-To: <31821f3538ddacb7e57e0248e86a3d28f9789d2f.1559580831.git.andreyknvl@google.com>
List-Unsubscribe: <https://lists.freedesktop.org/mailman/options/dri-devel>,
 <mailto:dri-devel-request@lists.freedesktop.org?subject=unsubscribe>
List-Archive: <https://lists.freedesktop.org/archives/dri-devel>
List-Post: <mailto:dri-devel@lists.freedesktop.org>
List-Help: <mailto:dri-devel-request@lists.freedesktop.org?subject=help>
List-Subscribe: <https://lists.freedesktop.org/mailman/listinfo/dri-devel>,
 <mailto:dri-devel-request@lists.freedesktop.org?subject=subscribe>
Errors-To: dri-devel-bounces@lists.freedesktop.org
Sender: "dri-devel" <dri-devel-bounces@lists.freedesktop.org>
To: Andrey Konovalov <andreyknvl@google.com>
Cc: Mark Rutland <mark.rutland@arm.com>, kvm@vger.kernel.org, Szabolcs Nagy <Szabolcs.Nagy@arm.com>, Catalin Marinas <catalin.marinas@arm.com>, Will Deacon <will.deacon@arm.com>, dri-devel@lists.freedesktop.org, linux-mm@kvack.org, Khalid Aziz <khalid.aziz@oracle.com>, linux-kselftest@vger.kernel.org, Mauro Carvalho Chehab <mchehab+samsung@kernel.org>, Felix Kuehling <Felix.Kuehling@amd.com>, Vincenzo Frascino <vincenzo.frascino@arm.com>, Jacob Bramley <Jacob.Bramley@arm.com>, Leon Romanovsky <leon@kernel.org>, linux-rdma@vger.kernel.org, amd-gfx@lists.freedesktop.org, Christoph Hellwig <hch@infradead.org>, Jason Gunthorpe <jgg@ziepe.ca>, Dmitry Vyukov <dvyukov@google.com>, Dave Martin <Dave.Martin@arm.com>, Evgeniy Stepanov <eugenis@google.com>, linux-media@vger.kernel.org, Kevin Brodsky <kevin.brodsky@arm.com>, Ruben Ayrapetyan <Ruben.Ayrapetyan@arm.com>, Ramana
List-Id: linux-rdma@vger.kernel.org
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