linux-kernel - Re: [PATCH 6/6] kexec: Support for Kexec on panic using new system call

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Message-ID: <20131204015127.GC3298@localhost.localdomain>
Date:	Wed, 4 Dec 2013 09:51:27 +0800
From:	Baoquan He <bhe@...hat.com>
To:	Vivek Goyal <vgoyal@...hat.com>
Cc:	mjg59@...f.ucam.org, greg@...ah.com, kexec@...ts.infradead.org,
	linux-kernel@...r.kernel.org, ebiederm@...ssion.com, hpa@...or.com
Subject: Re: [PATCH 6/6] kexec: Support for Kexec on panic using new system
 call

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
> 
> _______________________________________________
> kexec mailing list
> kexec@...ts.infradead.org
> http://lists.infradead.org/mailman/listinfo/kexec
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