--- zzzz-none-000/linux-2.6.19.2/arch/mips/sgi-ip27/ip27-irq.c	2007-01-10 19:10:37.000000000 +0000
+++ davinci-8020-5505/linux-2.6.19.2/arch/mips/sgi-ip27/ip27-irq.c	2007-01-11 07:38:19.000000000 +0000
@@ -354,6 +354,29 @@
 	.end		= end_bridge_irq,
 };
 
+static unsigned long irq_map[NR_IRQS / BITS_PER_LONG];
+
+int allocate_irqno(void)
+{
+	int irq;
+
+again:
+	irq = find_first_zero_bit(irq_map, NR_IRQS);
+
+	if (irq >= NR_IRQS)
+		return -ENOSPC;
+
+	if (test_and_set_bit(irq, irq_map))
+		goto again;
+
+	return irq;
+}
+
+void free_irqno(unsigned int irq)
+{
+	clear_bit(irq, irq_map);
+}
+
 void __devinit register_bridge_irq(unsigned int irq)
 {
 	irq_desc[irq].status	= IRQ_DISABLED;