powerpc/numa: Prefer node id queried from vphn

Node id queried from the static device tree may not
be correct. For example: it may always show 0 on a shared processor.
Hence prefer the node id queried from vphn and fallback on the device tree
based node id if vphn query fails.
Signed-off-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200818081104.57888-3-srikar@linux.vnet.ibm.com

arch/powerpc/mm/numa.c

@@ -728,21 +728,22 @@ static int __init parse_numa_properties(void)
 	 */
 	for_each_present_cpu(i) {
 		struct device_node *cpu;
-		int nid;
-
-		cpu = of_get_cpu_node(i, NULL);
-		BUG_ON(!cpu);
-		nid = of_node_to_nid_single(cpu);
-		of_node_put(cpu);
+		int nid = vphn_get_nid(i);
 
 		/*
 		 * Don't fall back to default_nid yet -- we will plug
 		 * cpus into nodes once the memory scan has discovered
 		 * the topology.
 		 */
-		if (nid < 0)
-			continue;
-		node_set_online(nid);
+		if (nid == NUMA_NO_NODE) {
+			cpu = of_get_cpu_node(i, NULL);
+			BUG_ON(!cpu);
+			nid = of_node_to_nid_single(cpu);
+			of_node_put(cpu);
+		}
+
+		if (likely(nid > 0))
+			node_set_online(nid);
 	}
 
 	get_n_mem_cells(&n_mem_addr_cells, &n_mem_size_cells);