linux-kernel - Re: [patch 0/9] kdump: Patch series for s390 support

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Date:	Mon, 25 Jul 2011 14:07:14 -0400
From:	Vivek Goyal <vgoyal@...hat.com>
To:	Michael Holzheu <holzheu@...ux.vnet.ibm.com>
Cc:	Martin Schwidefsky <schwidefsky@...ibm.com>, ebiederm@...ssion.com,
	hbabu@...ibm.com, mahesh@...ux.vnet.ibm.com,
	oomichi@....nes.nec.co.jp, horms@...ge.net.au,
	heiko.carstens@...ibm.com, kexec@...ts.infradead.org,
	linux-kernel@...r.kernel.org, linux-s390@...r.kernel.org
Subject: Re: [patch 0/9] kdump: Patch series for s390 support

On Fri, Jul 22, 2011 at 05:26:32PM +0200, Michael Holzheu wrote:
> Hello Vivek,
> 
> Still thinking how we best get elfcorehdr size...
> 
> On Mon, 2011-07-18 at 11:25 -0400, Vivek Goyal wrote:
> > On Mon, Jul 18, 2011 at 04:44:13PM +0200, Michael Holzheu wrote:
> > You could do that but I think a more generic parameter will make more
> > sense.
> > 
> > - Either something along the lines of memmap=
> > - Or excludemem=x@y
> > - Or modify memory map in s390 specific bootloading protocol block etc.
> 
> Wouldn't it be most natural to pass the length along with the address of
> the ELF core header? What about extending the kernel elfcorehdr kernel
> parameter and adding optional size:
> 
> elfcorehdr=<addr>[KMG],<size>[KMG]

I think it could be memap= style. elfcorehdr=X[KMG]@Y[KMG]. Though to
support backward compatibility we will have to support old format of
plain elfcorehdr=X too.

Thanks
Vivek
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