linux-kernel - Re: [Patch 6/7] powerpc: implement crashkernel=auto

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Message-ID: <20090805135009.GI7259@hmsreliant.think-freely.org>
Date:	Wed, 5 Aug 2009 09:50:09 -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 6/7] powerpc: implement crashkernel=auto

On Wed, Aug 05, 2009 at 07:20:00AM -0400, Amerigo Wang wrote:
> 
> Since in patch 2/7 we already implement the generic part, this will
> add the rest part for powerpc.
> 
> Signed-off-by: WANG Cong <amwang@...hat.com>
> 
> ---
> Index: linux-2.6/arch/powerpc/include/asm/kexec.h
> ===================================================================
> --- linux-2.6.orig/arch/powerpc/include/asm/kexec.h
> +++ linux-2.6/arch/powerpc/include/asm/kexec.h
> @@ -39,6 +39,29 @@ typedef void (*crash_shutdown_t)(void);
>  
>  #ifdef CONFIG_KEXEC
>  
> +#ifdef CONFIG_KEXEC_AUTO_RESERVE
> +#ifndef KEXEC_AUTO_RESERVED_SIZE
> +#define KEXEC_AUTO_RESERVED_SIZE 1ULL<<28 /* 256M */
> +#endif
> +#ifndef KEXEC_AUTO_THRESHOLD
> +#define KEXEC_AUTO_THRESHOLD 1ULL<<32 /* 4G */
> +#endif
> +static inline
> +unsigned long long arch_default_crash_size(unsigned long long total_size)
> +{
> +	if (total_size < KEXEC_AUTO_THRESHOLD)
> +		return 0;
> +	else
> +		return KEXEC_AUTO_RESERVED_SIZE;
> +}
> +static inline
> +unsigned long long arch_default_crash_base(void)
> +{
> +	/* On ppc, 0 means find the base address automatically. */
> +	return 0;
> +}
> +#endif
> +
>  /*
>   * This function is responsible for capturing register states if coming
>   * via panic or invoking dump using sysrq-trigger.

Same comment here, this looks like it really belongs in asm-generic to me.
Neil

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