linux-kernel - Re: [Patch 5/7] powerpc: add CONFIG_KEXEC_AUTO

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Date:	Wed, 5 Aug 2009 09:49:28 -0400
From:	Neil Horman <nhorman@...hat.com>
To:	Amerigo Wang <amwang@...hat.com>
Cc:	linux-kernel@...r.kernel.org, tony.luck@...el.com,
	linux-ia64@...r.kernel.org,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	akpm@...ux-foundation.org, Ingo Molnar <mingo@...e.hu>,
	Anton Vorontsov <avorontsov@...mvista.com>
Subject: Re: [Patch 5/7] powerpc: add CONFIG_KEXEC_AUTO_RESERVE

On Wed, Aug 05, 2009 at 07:19:51AM -0400, Amerigo Wang wrote:
> 
> Introduce a new config option KEXEC_AUTO_RESERVE for powerpc.
> 
> Signed-off-by: WANG Cong <amwang@...hat.com>
> 
> ---
> Index: linux-2.6/arch/powerpc/Kconfig
> ===================================================================
> --- linux-2.6.orig/arch/powerpc/Kconfig
> +++ linux-2.6/arch/powerpc/Kconfig
> @@ -346,6 +346,16 @@ config KEXEC
>  	  support.  As of this writing the exact hardware interface is
>  	  strongly in flux, so no good recommendation can be made.
>  
> +config KEXEC_AUTO_RESERVE
> +	bool "automatically reserve memory for kexec kernel"
> +	depends on KEXEC
> +	default y
> +	---help---
> +	  Automatically reserve memory for a kexec kernel, so that you don't
> +	  need to specify numbers for the "crashkernel=X@Y" boot option,
> +	  instead you can use "crashkernel=auto".
> +	  On PPC, 256M is reserved and only when you have memory > 4G.
> +
>  config CRASH_DUMP
>  	bool "Build a kdump crash kernel"
>  	depends on PPC64 || 6xx

Acked-by: Neil Horman <nhorman@...driver.com>
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