linux-kernel - Re: [PATCH] add additional symbols to /sys/kernel/vmcoreinfo data for ppc(64)

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Date:	Fri, 17 Oct 2008 17:08:54 -0400
From:	Vivek Goyal <vgoyal@...hat.com>
To:	Neil Horman <nhorman@...driver.com>
Cc:	linux-kernel@...r.kernel.org, kexec@...ts.infradead.org,
	hbabu@...ibm.com
Subject: Re: [PATCH] add additional symbols to /sys/kernel/vmcoreinfo data
	for ppc(64)

On Thu, Oct 09, 2008 at 11:20:27AM -0400, Neil Horman wrote:
> Hey-
> 	The makdumpdile dump filtering program, in some modes of operation needs
> the node_data and/or contig_page_data symbols to function properly.  These
> symbols are missing from the powerpc kernel.  This patch adds those symbols in
> properly.  Tested successfully by myself and the reporter.
> 
> Regards
> Neil
> 
> Signed-off-by: Neil Horman <nhorman@...driver.com>
> 
> 
>  machine_kexec.c |   10 ++++++++++
>  1 file changed, 10 insertions(+)
> 
> 
> diff --git a/arch/powerpc/kernel/machine_kexec.c b/arch/powerpc/kernel/machine_kexec.c
> index aab7688..2f9b5aa 100644
> --- a/arch/powerpc/kernel/machine_kexec.c
> +++ b/arch/powerpc/kernel/machine_kexec.c
> @@ -44,6 +44,16 @@ void machine_kexec_cleanup(struct kimage *image)
>  		ppc_md.machine_kexec_cleanup(image);
>  }
>  
> +void arch_crash_save_vmcoreinfo(void)
> +{
> +#ifdef CONFIG_NEED_MULTIPLE_NODES
> +	VMCOREINFO_SYMBOL(node_data);
> +	VMCOREINFO_LENGTH(node_data, MAX_NUMNODES);
> +#else
> +	VMCOREINFO_SYMBOL(contig_page_data);
> +#endif
> +}
> +

Hi Neil,

Looks like contig_page_data is already being saved in arch independent
portion of kexec (crash_save_vmcoreinfo_init()). We probably don't need
to save it here again?

#ifndef CONFIG_NEED_MULTIPLE_NODES
        VMCOREINFO_SYMBOL(mem_map);
        VMCOREINFO_SYMBOL(contig_page_data);
#endif

Thanks
Vivek
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