diff --git a/kernel/up.c b/kernel/up.c
index ce62cc9..c04b9dc 100644
--- a/kernel/up.c
+++ b/kernel/up.c
@@ -9,10 +9,12 @@
 int smp_call_function_single(int cpu, void (*func) (void *info), void *info,
 				int wait)
 {
-	WARN_ON(cpuid != 0);
+	WARN_ON(cpu != 0);
+
 	local_irq_disable();
 	(func)(info);
 	local_irq_enable();
+
 	return 0;
 }
 EXPORT_SYMBOL(smp_call_function_single);