From mboxrd@z Thu Jan  1 00:00:00 1970
From: Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>
Subject: Re: [PATCH 2/4] lib/scatterlist: Avoid potential
 scatterlist entry overflow
Date: Tue, 7 Mar 2017 10:16:59 +0000
Message-ID: <35181d49-c33e-0de7-e73d-7d51efafb38b@linux.intel.com>
References: <1484575930-6810-1-git-send-email-tvrtko.ursulin@linux.intel.com>
 <1484575930-6810-2-git-send-email-tvrtko.ursulin@linux.intel.com>
 <21a59594-a4bc-4d94-ecc0-ebf87cbec35a@linux.intel.com>
Mime-Version: 1.0
Content-Type: text/plain; charset="utf-8"; Format="flowed"
Content-Transfer-Encoding: base64
Return-path: <intel-gfx-bounces@lists.freedesktop.org>
Received: from mga09.intel.com (mga09.intel.com [134.134.136.24])
 by gabe.freedesktop.org (Postfix) with ESMTPS id 12CF68919D
 for <Intel-gfx@lists.freedesktop.org>; Tue,  7 Mar 2017 10:17:12 +0000 (UTC)
In-Reply-To: <21a59594-a4bc-4d94-ecc0-ebf87cbec35a@linux.intel.com>
List-Unsubscribe: <https://lists.freedesktop.org/mailman/options/intel-gfx>,
 <mailto:intel-gfx-request@lists.freedesktop.org?subject=unsubscribe>
List-Archive: <https://lists.freedesktop.org/archives/intel-gfx>
List-Post: <mailto:intel-gfx@lists.freedesktop.org>
List-Help: <mailto:intel-gfx-request@lists.freedesktop.org?subject=help>
List-Subscribe: <https://lists.freedesktop.org/mailman/listinfo/intel-gfx>,
 <mailto:intel-gfx-request@lists.freedesktop.org?subject=subscribe>
Errors-To: intel-gfx-bounces@lists.freedesktop.org
Sender: "Intel-gfx" <intel-gfx-bounces@lists.freedesktop.org>
To: Tvrtko Ursulin <tursulin@ursulin.net>, Intel-gfx@lists.freedesktop.org, David Dillow <dillow@google.com>
Cc: Masahiro Yamada <yamada.masahiro@socionext.com>, Andy Shevchenko <andy.shevchenko@gmail.com>, linux-kernel@vger.kernel.org
List-Id: intel-gfx@lists.freedesktop.org
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