linux-kernel - Re: [discuss] [patch 3/5] Use extended crashkernel command line on x86

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Message-ID: <20070911051453.GB5053@in.ibm.com>
Date:	Tue, 11 Sep 2007 10:44:53 +0530
From:	Vivek Goyal <vgoyal@...ibm.com>
To:	Yinghai Lu <yhlu.kernel@...il.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	linux-arch@...r.kernel.org, discuss@...-64.org,
	kexec@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Bernhard Walle <bwalle@...e.de>
Subject: Re: [discuss] [patch 3/5] Use extended crashkernel command line on x86_64

On Sun, Sep 09, 2007 at 08:52:58PM +0200, Bernhard Walle wrote:
> * Yinghai Lu <yhlu.kernel@...il.com> [2007-09-09 19:27]:
> > >
> > > +#ifdef CONFIG_KEXEC
> > ...
> > 
> > CONFIG_KEXEC or CONFIG_CRASH_DUMP?
> 
> Good question. The crashkernel parameter was CONFIG_KEXEC before, and
> I also wondered why, but I didn't change this because maybe there's
> some reason I don't know.
> 
> Vivek, do you know why this was CONFIG_KEXEC?
> 
> 

Bernhard,

As Eric mentioned, CONFIG_CRASH_DUMP has been used for all dump capturing
infrastructure and rest of the kexec and kexec on panic functionality
has been put under CONFIG_KEXEC. 

Keeping memory reservation under CONFIG_KEXEC helps in a sense when
somebody is not using a relocatable kernel and uses a custom kernel for dump
capture. In that case he does not have to enable CONFIG_CRASH_DUMP in the
first kernel.

Thanks
Vivek
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