--- zzzz-none-000/linux-2.6.19.2/arch/x86_64/kernel/smp.c	2007-01-10 19:10:37.000000000 +0000
+++ davinci-8020-5505/linux-2.6.19.2/arch/x86_64/kernel/smp.c	2007-01-11 07:38:19.000000000 +0000
@@ -376,8 +376,9 @@
 	/* prevent preemption and reschedule on another processor */
 	int me = get_cpu();
 	if (cpu == me) {
+		WARN_ON(1);
 		put_cpu();
-		return 0;
+		return -EBUSY;
 	}
 	spin_lock_bh(&call_lock);
 	__smp_call_function_single(cpu, func, info, nonatomic, wait);