From mboxrd@z Thu Jan  1 00:00:00 1970
From: Daniel Vetter <daniel@ffwll.ch>
Subject: Re: [PATCH 01/33] drm/i915: Add smp_rmb() to busy
 ioctl's RCU dance
Date: Wed, 10 Aug 2016 12:13:59 +0200
Message-ID: <20160810101359.GZ6232@phenom.ffwll.local>
References: <1470581141-14432-1-git-send-email-chris@chris-wilson.co.uk>
 <1470581141-14432-2-git-send-email-chris@chris-wilson.co.uk>
 <20160808091259.GX6232@phenom.ffwll.local>
 <20160808093025.GE11646@nuc-i3427.alporthouse.com>
 <20160808094502.GF11646@nuc-i3427.alporthouse.com>
 <1470724608.4596.8.camel@linux.intel.com>
 <20160809071411.GG23417@nuc-i3427.alporthouse.com>
 <1470732536.4596.10.camel@linux.intel.com>
 <20160809090530.GB21147@nuc-i3427.alporthouse.com>
 <20160810101237.GY6232@phenom.ffwll.local>
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 mail-wm0-x243.google.com (mail-wm0-x243.google.com
 [IPv6:2a00:1450:400c:c09::243])
 by gabe.freedesktop.org (Postfix) with ESMTPS id BC7606E712
 for <intel-gfx@lists.freedesktop.org>; Wed, 10 Aug 2016 10:14:15 +0000 (UTC)
Received: by mail-wm0-x243.google.com with SMTP id q128so8571716wma.1
 for <intel-gfx@lists.freedesktop.org>; Wed, 10 Aug 2016 03:14:15 -0700 (PDT)
Content-Disposition: inline
In-Reply-To: <20160810101237.GY6232@phenom.ffwll.local>
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>, Joonas Lahtinen <joonas.lahtinen@linux.intel.com>, Daniel Vetter <daniel@ffwll.ch>, intel-gfx@lists.freedesktop.org, Daniel Vetter <daniel.vetter@ffwll.ch>
List-Id: intel-gfx@lists.freedesktop.org
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