From mboxrd@z Thu Jan  1 00:00:00 1970
From: Chris Wilson <chris@chris-wilson.co.uk>
Subject: [PATCH 40/70] drm/i915: Reduce locking in gen8 IRQ
	handler
Date: Tue,  7 Apr 2015 16:21:04 +0100
Message-ID: <1428420094-18352-41-git-send-email-chris@chris-wilson.co.uk>
References: <1428420094-18352-1-git-send-email-chris@chris-wilson.co.uk>
Mime-Version: 1.0
Content-Type: text/plain; charset="utf-8"
Content-Transfer-Encoding: base64
Return-path: <intel-gfx-bounces@lists.freedesktop.org>
Received: from relay.fireflyinternet.com (hostedrelay.fireflyinternet.com
 [109.228.30.76])
 by gabe.freedesktop.org (Postfix) with ESMTP id 976A46E5B7
 for <intel-gfx@lists.freedesktop.org>; Tue,  7 Apr 2015 08:22:15 -0700 (PDT)
In-Reply-To: <1428420094-18352-1-git-send-email-chris@chris-wilson.co.uk>
List-Unsubscribe: <http://lists.freedesktop.org/mailman/options/intel-gfx>,
 <mailto:intel-gfx-request@lists.freedesktop.org?subject=unsubscribe>
List-Archive: <http://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: <http://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
List-Id: intel-gfx@lists.freedesktop.org
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