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Date: Wed, 4 Dec 2013 09:51:27 +0800
From: Baoquan He <bhe@redhat.com>
Subject: Re: [PATCH 6/6] kexec: Support for Kexec on panic using new system
 call
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To: Vivek Goyal <vgoyal@redhat.com>
Cc: mjg59@srcf.ucam.org, greg@kroah.com, kexec@lists.infradead.org, linux-kernel@vger.kernel.org, ebiederm@xmission.com, hpa@zytor.com

On 12/02/13 at 10:30am, Vivek Goyal wrote:
> On Thu, Nov 28, 2013 at 07:28:16PM +0800, Baoquan He wrote:
> 
> [..]
> > > +int crash_copy_backup_region(struct kimage *image)
> > > +{
> > 
> > Why need this func be called, backup region has been added into crash
> > segment by kexec_add_buffer, and then buffer copy is done in
> > kimage_load_crash_segment. I think this copy is handled twice. Please
> > correct me if I am wrong.
> > 
> 
> Hi Bao,
> 
> kexec_add_buffer() will copy the backup region but it will happen when
> crash kernel is loaded. We want snapshot of backup region at the time
> of crash and that's why this second call to copy backup region and it
> is executed after the crash.

Did we do this before? And will this region  be changed after 1st kernel
boot


> 
> Thanks
> Vivek
> 
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