--- zzzz-none-000/linux-2.6.32.61/arch/mips/include/asm/irq.h	2013-06-10 09:43:48.000000000 +0000
+++ ar9-7330-650/linux-2.6.32.61/arch/mips/include/asm/irq.h	2010-07-16 10:24:07.000000000 +0000
@@ -41,7 +41,7 @@
 
 #else
 
-static inline void smtc_im_ack_irq(unsigned int irq)
+static inline void smtc_im_ack_irq(unsigned int irq __attribute__ ((unused)))
 {
 }