From mboxrd@z Thu Jan  1 00:00:00 1970
Return-path: <kexec-bounces+dwmw2=infradead.org@lists.infradead.org>
Received: from out03.mta.xmission.com ([166.70.13.233])
 by bombadil.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux))
 id 1iKKkS-0006uY-Sg
 for kexec@lists.infradead.org; Tue, 15 Oct 2019 11:12:18 +0000
From: ebiederm@xmission.com (Eric W. Biederman)
References: <20191012022140.19003-1-lijiang@redhat.com>
 <20191012022140.19003-4-lijiang@redhat.com>
 <87d0f22oi5.fsf@x220.int.ebiederm.org>
 <20191012121625.GA11587@dhcp-128-65.nay.redhat.com>
 <f3fc12b9-be39-d430-52f5-d1b76b2599a3@redhat.com>
Date: Tue, 15 Oct 2019 06:11:21 -0500
In-Reply-To: <f3fc12b9-be39-d430-52f5-d1b76b2599a3@redhat.com> (lijiang's
 message of "Mon, 14 Oct 2019 18:02:22 +0800")
Message-ID: <87tv8az2jq.fsf@x220.int.ebiederm.org>
MIME-Version: 1.0
Subject: Re: [PATCH 3/3 v3] x86/kdump: clean up all the code related to the
 backup region
List-Id: <kexec.lists.infradead.org>
List-Unsubscribe: <http://lists.infradead.org/mailman/options/kexec>,
 <mailto:kexec-request@lists.infradead.org?subject=unsubscribe>
List-Archive: <http://lists.infradead.org/pipermail/kexec/>
List-Post: <mailto:kexec@lists.infradead.org>
List-Help: <mailto:kexec-request@lists.infradead.org?subject=help>
List-Subscribe: <http://lists.infradead.org/mailman/listinfo/kexec>,
 <mailto:kexec-request@lists.infradead.org?subject=subscribe>
Content-Type: text/plain; charset="utf-8"
Content-Transfer-Encoding: base64
Sender: "kexec" <kexec-bounces@lists.infradead.org>
Errors-To: kexec-bounces+dwmw2=infradead.org@lists.infradead.org
To: lijiang <lijiang@redhat.com>
Cc: jgross@suse.com, Thomas.Lendacky@amd.com, bhe@redhat.com, x86@kernel.org, kexec@lists.infradead.org, linux-kernel@vger.kernel.org, dhowells@redhat.com, mingo@redhat.com, bp@alien8.de, hpa@zytor.com, tglx@linutronix.de, Dave Young <dyoung@redhat.com>, vgoyal@redhat.com
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