From mboxrd@z Thu Jan  1 00:00:00 1970
From: George Dunlap <george.dunlap@citrix.com>
Subject: [PATCH RFC 1/4] libxl: Move check for local access to a
	funciton
Date: Wed, 2 Mar 2016 11:14:01 +0000
Message-ID: <1456917244-2908-2-git-send-email-george.dunlap@citrix.com>
References: <1456917244-2908-1-git-send-email-george.dunlap@citrix.com>
Mime-Version: 1.0
Content-Type: text/plain; charset="utf-8"
Content-Transfer-Encoding: base64
Return-path: <xen-devel-bounces@lists.xen.org>
In-Reply-To: <1456917244-2908-1-git-send-email-george.dunlap@citrix.com>
List-Unsubscribe: <http://lists.xen.org/cgi-bin/mailman/options/xen-devel>,
 <mailto:xen-devel-request@lists.xen.org?subject=unsubscribe>
List-Post: <mailto:xen-devel@lists.xen.org>
List-Help: <mailto:xen-devel-request@lists.xen.org?subject=help>
List-Subscribe: <http://lists.xen.org/cgi-bin/mailman/listinfo/xen-devel>,
 <mailto:xen-devel-request@lists.xen.org?subject=subscribe>
Errors-To: xen-devel-bounces@lists.xen.org
Sender: "Xen-devel" <xen-devel-bounces@lists.xen.org>
To: xen-devel@lists.xen.org
Cc: George Dunlap <george.dunlap@eu.citrix.com>, Ian Jackson <ian.jackson@citrix.com>, Wei Liu <wei.liu2@citrix.com>, Ian Campbell <ian.campbell@citrix.com>, Roger Pau Monne <roger.pau@citrix.com>
List-Id: xen-devel@lists.xenproject.org
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