From mboxrd@z Thu Jan  1 00:00:00 1970
From: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Subject: [PATCH 2/3] drm/rect: Handle rounding errors in
 drm_rect_clip_scaled
Date: Thu, 26 Apr 2018 10:28:20 +0200
Message-ID: <20180426082821.11129-2-maarten.lankhorst@linux.intel.com>
References: <20180426082821.11129-1-maarten.lankhorst@linux.intel.com>
Mime-Version: 1.0
Content-Type: text/plain; charset="utf-8"
Content-Transfer-Encoding: base64
Return-path: <intel-gfx-bounces@lists.freedesktop.org>
In-Reply-To: <20180426082821.11129-1-maarten.lankhorst@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: intel-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org
List-Id: dri-devel@lists.freedesktop.org
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