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

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/srmmu.c b/arch/sparc/mm/srmmu.c
index fe7ed08..06c9a7d 100644
--- a/arch/sparc/mm/srmmu.c
+++ b/arch/sparc/mm/srmmu.c
@@ -1425,7 +1425,7 @@
 				min_line_size = vac_line_size;
 			//FIXME: cpus not contiguous!!
 			cpu++;
-			if (cpu >= NR_CPUS || !cpu_online(cpu))
+			if (cpu >= nr_cpu_ids || !cpu_online(cpu))
 				break;
 #else
 			break;