Index: kernel/generic/include/ipc/irq.h
===================================================================
--- kernel/generic/include/ipc/irq.h	(revision 31696b4fbd84b5c8090a758e9a35ba49a9156b52)
+++ kernel/generic/include/ipc/irq.h	(revision 666773c10427b1716034f10baeb1edf5994e000f)
@@ -54,4 +54,6 @@
  * ipc_irq_send_msg_m(), where m is the number of payload arguments.
  */
+#define ipc_irq_send_msg_0(irq) \
+    ipc_irq_send_msg((irq), 0, 0, 0, 0, 0)
 #define ipc_irq_send_msg_1(irq, a1) \
     ipc_irq_send_msg((irq), (a1), 0, 0, 0, 0)