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

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Date:	Thu, 13 Aug 2009 16:19:54 +0800
From:	Amerigo Wang <amwang@...hat.com>
To:	Bernhard Walle <bernhard.walle@....de>
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

Bernhard Walle wrote:
> 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 ...
>   
Sure.

But if we disable CONFIG_KEXEC_AUTO_RESERVE, that means crashkernel=auto 
will be invalid, this is the same as it is now.

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