linux-kernel - Re: [PATCH] powerpc: Add vmcoreinfo symbols to allow makdumpfile to filter core files properly

Open Source and information security mailing list archives

Date:	Mon, 26 Jul 2010 11:23:15 -0400
From:	Neil Horman <nhorman@...driver.com>
To:	linux-kernel@...r.kernel.org, kexec@...ts.infradead.org,
	vgoyal@...hat.com, hbabu@...ibm.com, benh@...nel.crashing.org,
	paulus@...ba.org, linuxppc-dev@...abs.org
Subject: Re: [PATCH] powerpc: Add vmcoreinfo symbols to allow makdumpfile to
 filter core files properly

On Tue, Jul 13, 2010 at 09:46:09AM -0400, Neil Horman wrote:
> Hey all-
> 	About 2 years ago now, I sent this patch upstream to allow makedumpfile
> to properly filter cores on ppc64:
> http://www.mail-archive.com/kexec@lists.infradead.org/msg02426.html
> It got acks from the kexec folks so I pulled it into RHEL, but I never checked
> back here to make sure it ever made it in, which apparently it didn't.  It still
> needs to be included, so I'm reposting it here, making sure to copy all the ppc
> folks this time.  I've retested it on the latest linus kernel and it works fine,
> allowing makedumpfile to find all the symbols it needs to properly strip a
> vmcore on ppc64.
> 
> Neil
> 
> Signed-off-by: Neil Horman <nhorman@...driver.com>
> 
Ping, anyone want to chime in on this, its needed for dump filtering to work
properly on ppc64
Neil

> 
>  machine_kexec.c |   12 ++++++++++++
>  1 file changed, 12 insertions(+)
> 
> 
> diff --git a/arch/powerpc/kernel/machine_kexec.c b/arch/powerpc/kernel/machine_kexec.c
> index bb3d893..0df7031 100644
> --- a/arch/powerpc/kernel/machine_kexec.c
> +++ b/arch/powerpc/kernel/machine_kexec.c
> @@ -45,6 +45,18 @@ 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);
> +#endif
> +#ifndef CONFIG_NEED_MULTIPLE_NODES
> +	VMCOREINFO_SYMBOL(contig_page_data);
> +#endif
> +}
> +
>  /*
>   * Do not allocate memory (or fail in any way) in machine_kexec().
>   * We are past the point of no return, committed to rebooting now.
> 
> _______________________________________________
> kexec mailing list
> kexec@...ts.infradead.org
> http://lists.infradead.org/mailman/listinfo/kexec
> 
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