cpumask: IA64: Introduce cpumask_of_{node,pcibus} to replace {node,pcibus}_to_cpumask

Impact: New APIs

The old node_to_cpumask/node_to_pcibus returned a cpumask_t: these
return a pointer to a struct cpumask.  Part of removing cpumasks from
the stack.

We can also use the new for_each_cpu_and() to avoid a temporary cpumask,
and a gratuitous test in sn_topology_show.

(Includes fix from KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>)

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Cc: Tony Luck <tony.luck@intel.com>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>

arch/ia64/sn/kernel/sn2/sn_hwperf.c

@@ -385,7 +385,6 @@ static int sn_topology_show(struct seq_file *s, void *d)
 	int j;
 	const char *slabname;
 	int ordinal;
-	cpumask_t cpumask;
 	char slice;
 	struct cpuinfo_ia64 *c;
 	struct sn_hwperf_port_info *ptdata;
@@ -473,23 +472,21 @@ static int sn_topology_show(struct seq_file *s, void *d)
 		 * CPUs on this node, if any
 		 */
 		if (!SN_HWPERF_IS_IONODE(obj)) {
-			cpumask = node_to_cpumask(ordinal);
-			for_each_online_cpu(i) {
-				if (cpu_isset(i, cpumask)) {
-					slice = 'a' + cpuid_to_slice(i);
-					c = cpu_data(i);
-					seq_printf(s, "cpu %d %s%c local"
-						" freq %luMHz, arch ia64",
-						i, obj->location, slice,
-						c->proc_freq / 1000000);
-					for_each_online_cpu(j) {
-						seq_printf(s, j ? ":%d" : ", dist %d",
-							node_distance(
+			for_each_cpu_and(i, cpu_online_mask,
+					 cpumask_of_node(ordinal)) {
+				slice = 'a' + cpuid_to_slice(i);
+				c = cpu_data(i);
+				seq_printf(s, "cpu %d %s%c local"
+					   " freq %luMHz, arch ia64",
+					   i, obj->location, slice,
+					   c->proc_freq / 1000000);
+				for_each_online_cpu(j) {
+					seq_printf(s, j ? ":%d" : ", dist %d",
+						   node_distance(
 						    	cpu_to_node(i),
 						    	cpu_to_node(j)));
-					}
-					seq_putc(s, '\n');
 				}
+				seq_putc(s, '\n');
 			}
 		}
 	}