Re: [PATCH RFC 3/5] powerpc:numa create 1:1 mappaing between chipid and nid

[Nishanth Aravamudan <nacc@linux.vnet.ibm.com>]

On 27.09.2015 [23:59:11 +0530], Raghavendra K T wrote:
> Once we have made the distinction between nid and chipid
> create a 1:1 mapping between them. This makes compacting the
> nids easy later.


Didn't the previous patch just do the opposite of...

> @@ -286,7 +308,7 @@ int of_node_to_nid(struct device_node *device)
> 
>  	of_node_get(device);
>  	while (device) {
> -		nid = of_node_to_chipid_single(device);
> +		nid = of_node_to_nid_single(device);
>  		if (nid != -1)
>  			break;
> 
> @@ -498,7 +520,7 @@ static int of_get_assoc_arrays(struct device_node *memory,
>  }
> 
>  /*
> - * This is like of_node_to_chipid_single() for memory represented in the
> + * This is like of_node_to_nid_single() for memory represented in the
>   * ibm,dynamic-reconfiguration-memory node.
>   */
>  static int of_drconf_to_nid_single(struct of_drconf_cell *drmem,
> @@ -557,7 +579,7 @@ static int numa_setup_cpu(unsigned long lcpu)
>  			goto out;
>  	}
> 
> -	nid = of_node_to_chipid_single(cpu);
> +	nid = of_node_to_nid_single(cpu);
> 
>  out_present:
>  	if (nid < 0 || !node_online(nid))
> @@ -754,7 +776,7 @@ static int __init parse_numa_properties(void)
> 
>  		cpu = of_get_cpu_node(i, NULL);
>  		BUG_ON(!cpu);
> -		nid = of_node_to_chipid_single(cpu);
> +		nid = of_node_to_nid_single(cpu);
>  		of_node_put(cpu);
> 
>  		/*
> @@ -796,7 +818,7 @@ new_range:
>  		 * have associativity properties.  If none, then
>  		 * everything goes to default_nid.
>  		 */
> -		nid = of_node_to_chipid_single(memory);
> +		nid = of_node_to_nid_single(memory);
>  		if (nid < 0)
>  			nid = default_nid;
> 
> @@ -1119,7 +1141,7 @@ static int hot_add_node_scn_to_nid(unsigned long scn_addr)
>  			if ((scn_addr < start) || (scn_addr >= (start + size)))
>  				continue;
> 
> -			nid = of_node_to_chipid_single(memory);
> +			nid = of_node_to_nid_single(memory);
>  			break;
>  		}
> 
> @@ -1415,7 +1437,7 @@ int arch_update_cpu_topology(void)
> 
>  		/* Use associativity from first thread for all siblings */
>  		vphn_get_associativity(cpu, associativity);
> -		new_nid = associativity_to_chipid(associativity);
> +		new_nid = associativity_to_nid(associativity);
>  		if (new_nid < 0 || !node_online(new_nid))
>  			new_nid = first_online_node;
> 

Why is this churn useful?