Index: sys/compat/linuxkpi/common/include/linux/ratelimit.h
===================================================================
--- /dev/null
+++ sys/compat/linuxkpi/common/include/linux/ratelimit.h
@@ -0,0 +1,17 @@
+/* Public domain. */
+
+#ifndef _LINUX_RATELIMIT_H
+#define _LINUX_RATELIMIT_H
+
+struct ratelimit_state {
+};
+
+#define DEFINE_RATELIMIT_STATE(name, interval, burst) \
+	int name __used = 1;
+
+#define __ratelimit(x)	(1)
+
+#define ratelimit_state_init(x, y, z)
+#define ratelimit_set_flags(x, y)
+
+#endif