diff --git a/sys/compat/linuxkpi/common/include/linux/interrupt.h b/sys/compat/linuxkpi/common/include/linux/interrupt.h
--- a/sys/compat/linuxkpi/common/include/linux/interrupt.h
+++ b/sys/compat/linuxkpi/common/include/linux/interrupt.h
@@ -47,6 +47,8 @@
 
 #define	IRQ_DISABLE_UNLAZY	0
 
+#define	IRQ_NOTCONNECTED	(1U << 31)
+
 int  lkpi_request_irq(struct device *, unsigned int, irq_handler_t,
 	irq_handler_t, unsigned long, const char *, void *);
 int  lkpi_enable_irq(unsigned int);