linux-kernel - Re: [Patch 0/8] V3 Implement crashkernel=auto

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Message-ID: <20090813053952.GA9037@mail1.bwalle.de>
Date:	Thu, 13 Aug 2009 07:39:52 +0200
From:	Bernhard Walle <bernhard.walle@....de>
To:	Amerigo Wang <amwang@...hat.com>
Cc:	linux-kernel@...r.kernel.org, tony.luck@...el.com,
	linux-ia64@...r.kernel.org, Neil Horman <nhorman@...hat.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Andi Kleen <andi@...stfloor.org>, akpm@...ux-foundation.org,
	Fenghua Yu <fenghua.yu@...el.com>, Ingo Molnar <mingo@...e.hu>,
	Anton Vorontsov <avorontsov@...mvista.com>
Subject: Re: [Patch 0/8] V3 Implement crashkernel=auto

Hi,

* Amerigo Wang <amwang@...hat.com> [2009-08-13 04:49]:
> Bernhard Walle wrote:
> >
> >Honestly I don't see why everything is guarded by
> >CONFIG_KEXEC_AUTO_RESERVE. We do we need that new configuration
> >option? I mean, if I don't specify 'crashkernel=auto', then the patch
> >does nothing, right? Then the option CONFIG_KEXEC_AUTO_RESERVE would
> >only be needed so save some bytes of code. Is that really worth it?
> 
> Hi,  CONFIG_KEXEC_AUTO_RESERVE is not for saving bytes, it just
> provides a choice for the user to decide to enable it or not.

Still, I don't understand it. When I don't say "crashkernel=auto" on
command line, then nothing is done, right? So the choice for the user
is the "crashkernel=auto". Why do we need CONFIG_KEXEC_AUTO_RESERVE
then? Maybe I just missed something in my logic ...


Regards,
Bernhard
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