Index: sys/compat/linuxkpi/common/include/linux/kfifo.h
===================================================================
--- sys/compat/linuxkpi/common/include/linux/kfifo.h
+++ sys/compat/linuxkpi/common/include/linux/kfifo.h
@@ -33,8 +33,26 @@
 #include <linux/slab.h>
 #include <linux/gfp.h>
 
-#define	INIT_KFIFO(x)	0
-#define	DECLARE_KFIFO(x, y, z)
+/*
+ * INIT_KFIFO() is used to initialize the structure declared with
+ * DECLARE_KFIFO(). It doesn't work with DECLARE_KFIFO_PTR().
+ */
+#define	INIT_KFIFO(_kf)							\
+	({								\
+		(_kf).total = sizeof((_kf).head) / sizeof(*(_kf).head);	\
+		(_kf).count = 0;					\
+		(_kf).first = 0;					\
+		(_kf).last = 0;						\
+	})
+
+#define	DECLARE_KFIFO(_name, _type, _size)				\
+	struct kfifo_ ## _name {					\
+		size_t		total;					\
+		size_t		count;					\
+		size_t		first;					\
+		size_t		last;					\
+		_type		head[_size];				\
+	} _name
 
 #define	DECLARE_KFIFO_PTR(_name, _type)					\
 	struct kfifo_ ## _name {					\