From mboxrd@z Thu Jan  1 00:00:00 1970
From: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Subject: [PATCH v7 1/5] livepatch: Disallow applying after an
	revert
Date: Wed, 21 Sep 2016 12:57:06 -0400
Message-ID: <1474477030-10722-2-git-send-email-konrad.wilk@oracle.com>
References: <1474477030-10722-1-git-send-email-konrad.wilk@oracle.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.bemta3.messagelabs.com ([195.245.230.39])
 by lists.xenproject.org with esmtp (Exim 4.84_2)
 (envelope-from <konrad.wilk@oracle.com>) id 1bmkps-0000G0-DL
 for xen-devel@lists.xenproject.org; Wed, 21 Sep 2016 16:57:28 +0000
In-Reply-To: <1474477030-10722-1-git-send-email-konrad.wilk@oracle.com>
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: konrad@kernel.org, xen-devel@lists.xenproject.org, ross.lagerwall@citrix.com
Cc: andrew.cooper3@citrix.com, Jan Beulich <jbeulich@suse.com>, Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
List-Id: xen-devel@lists.xenproject.org
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