From mboxrd@z Thu Jan  1 00:00:00 1970
From: Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>
Subject: Re: [PATCH] drm/i915: Avoid uninterruptible spinning in
 debugfs
Date: Fri, 1 Feb 2019 17:29:45 +0000
Message-ID: <fd2ef1f1-3076-4e68-fa1c-26f2b7d2294f@linux.intel.com>
References: <20190201102248.15144-1-chris@chris-wilson.co.uk>
 <20190201105237.12663-1-chris@chris-wilson.co.uk>
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 mga04.intel.com (mga04.intel.com [192.55.52.120])
 by gabe.freedesktop.org (Postfix) with ESMTPS id 40F7B6E2E4
 for <intel-gfx@lists.freedesktop.org>; Fri,  1 Feb 2019 17:29:39 +0000 (UTC)
In-Reply-To: <20190201105237.12663-1-chris@chris-wilson.co.uk>
Content-Language: en-US
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: Chris Wilson <chris@chris-wilson.co.uk>, intel-gfx@lists.freedesktop.org
List-Id: intel-gfx@lists.freedesktop.org
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