cpumask: prepare for iterators to only go to nr_cpu_ids/nr_cpumask_bits.: sparc64

Impact: cleanup, futureproof

In fact, all cpumask ops will only be valid (in general) for bit
numbers < nr_cpu_ids.  So use that instead of NR_CPUS in various
places.

This is always safe: no cpu number can be >= nr_cpu_ids, and
nr_cpu_ids is initialized to NR_CPUS at boot.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Mike Travis <travis@sgi.com>
Acked-by: Ingo Molnar <mingo@elte.hu>
diff --git a/arch/sparc/mm/init_64.c b/arch/sparc/mm/init_64.c
index 00373ce..2c8dfeb 100644
--- a/arch/sparc/mm/init_64.c
+++ b/arch/sparc/mm/init_64.c
@@ -1092,7 +1092,7 @@
 		if (strcmp(name, "cpu"))
 			continue;
 		id = mdesc_get_property(md, target, "id", NULL);
-		if (*id < NR_CPUS)
+		if (*id < nr_cpu_ids)
 			cpu_set(*id, *mask);
 	}
 }