[PATCH] x86-64: Only allocate per cpu data for possible CPUs, not compiled in CPUs.

Saves some memory except for hotplug situations.
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

arch/x86_64/kernel/setup64.c

@@ -94,7 +94,7 @@ void __init setup_per_cpu_areas(void)
 		size = PERCPU_ENOUGH_ROOM;
 #endif
 
-	for (i = 0; i < NR_CPUS; i++) { 
+	for_each_cpu_mask (i, cpu_possible_map) {
 		char *ptr;
 
 		if (!NODE_DATA(cpu_to_node(i))) {