diff --git a/sys/compat/linuxkpi/common/include/linux/compat.h b/sys/compat/linuxkpi/common/include/linux/compat.h
--- a/sys/compat/linuxkpi/common/include/linux/compat.h
+++ b/sys/compat/linuxkpi/common/include/linux/compat.h
@@ -58,4 +58,7 @@
 	return (0);
 }
 
+#define	compat_ptr(x)		((void *)(uintptr_t)x)
+#define	ptr_to_compat(x)	((uintptr_t)x)
+
 #endif	/* _LINUXKPI_LINUX_COMPAT_H_ */