From mboxrd@z Thu Jan  1 00:00:00 1970
From: George Dunlap <george.dunlap@citrix.com>
Subject: Re: [PATCH v3 5/6] xen: RCU: avoid busy waiting until
 the end of grace period.
Date: Tue, 29 Aug 2017 17:06:40 +0100
Message-ID: <51e7db09-c337-479a-b9c8-15f898bf5839@citrix.com>
References: <150307710991.29525.3681195976643263117.stgit@Solace.fritz.box>
 <150307947767.29525.16150424729950084786.stgit@Solace.fritz.box>
 <599C480402000078001720A3@prv-mh.provo.novell.com>
Mime-Version: 1.0
Content-Type: text/plain; charset="utf-8"
Content-Transfer-Encoding: base64
Return-path: <xen-devel-bounces@lists.xen.org>
Received: from mail6.bemta5.messagelabs.com ([195.245.231.135])
 by lists.xenproject.org with esmtp (Exim 4.84_2)
 (envelope-from <prvs=40713ac88=George.Dunlap@citrix.com>)
 id 1dmj2L-0000yK-O3
 for xen-devel@lists.xenproject.org; Tue, 29 Aug 2017 16:06:45 +0000
In-Reply-To: <599C480402000078001720A3@prv-mh.provo.novell.com>
Content-Language: en-US
List-Unsubscribe: <https://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: <https://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: Jan Beulich <JBeulich@suse.com>, Dario Faggioli <dario.faggioli@citrix.com>
Cc: Stefano Stabellini <sstabellini@kernel.org>, Wei Liu <wei.liu2@citrix.com>, George Dunlap <george.dunlap@eu.citrix.com>, Andrew Cooper <andrew.cooper3@citrix.com>, Ian Jackson <ian.jackson@eu.citrix.com>, Tim Deegan <tim@xen.org>, Julien Grall <julien.grall@arm.com>, xen-devel@lists.xenproject.org
List-Id: xen-devel@lists.xenproject.org
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