[2/4] [RFC] ppc64 early_pfn_to_nid stop using numa_memory_lookup

[mike kravetz]

On Thu, May 19, 2005 at 05:45:23PM +0100, Andy Whitcroft wrote:
> +/* Find the owning node for a pfn. */
> +int early_pfn_to_nid(unsigned long pfn)
> +{
> +        int nid;
> +
> +        for (nid = 0; nid < MAX_NUMNODES &&
> +			init_node_data[nid].node_end_pfn; nid++) {
> +		unsigned long start = init_node_data[nid].node_start_pfn;
> +		unsigned long end = init_node_data[nid].node_end_pfn;
> +                if (start <= pfn && pfn <= end)
> +                        return nid;
> +	}
> +
> +        return 0;
> +}

Can't do this.  Remember the 'swiss cheese' POWER numa model?
init_node_data represents the 'range' of valid pfn's on a given
node.  These ranges may overlap.  So, a given pfn may fall into
the range of multiple nodes as represented by init_node_data.
init_node_data is mostly used to 'prime' the zone initialization
code.  Currently, numa_memory_lookup_table is the only structure
properly initialized/created to do pfn_to_nid lookups.

-- 
Mike