--- linux/arch/i386/kernel/irq.c.old	Wed Feb 21 15:50:50 2001
+++ linux/arch/i386/kernel/irq.c	Wed Feb 21 15:51:23 2001
@@ -1080,7 +1080,6 @@
 
 	err = parse_hex_value(buffer, count, &new_value);
 
-#if CONFIG_SMP
 	/*
 	 * Do not allow disabling IRQs completely - it's a too easy
 	 * way to make the system unusable accidentally :-) At least
@@ -1088,7 +1087,6 @@
 	 */
 	if (!(new_value & cpu_online_map))
 		return -EINVAL;
-#endif
 
 	irq_affinity[irq] = new_value;
 	irq_desc[irq].handler->set_affinity(irq, new_value);