xen: set num_processors

Someone's got to do it.

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Cc: Stephen Tweedie <sct@redhat.com>
Cc: Eduardo Habkost <ehabkost@redhat.com>
Cc: Mark McLoughlin <markmc@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
diff --git a/arch/x86/xen/smp.c b/arch/x86/xen/smp.c
index 800bb21..8310ca0 100644
--- a/arch/x86/xen/smp.c
+++ b/arch/x86/xen/smp.c
@@ -155,8 +155,10 @@
 
 	for (i = 0; i < NR_CPUS; i++) {
 		rc = HYPERVISOR_vcpu_op(VCPUOP_is_up, i, NULL);
-		if (rc >= 0)
+		if (rc >= 0) {
+			num_processors++;
 			cpu_set(i, cpu_possible_map);
+		}
 	}
 }