Index: sys/compat/linuxkpi/common/include/linux/hrtimer.h
===================================================================
--- sys/compat/linuxkpi/common/include/linux/hrtimer.h
+++ sys/compat/linuxkpi/common/include/linux/hrtimer.h
@@ -30,6 +30,7 @@
 #include <sys/_mutex.h>
 
 #include <linux/ktime.h>
+#include <linux/rbtree.h>
 #include <linux/timer.h>
 
 enum hrtimer_mode {
Index: sys/compat/linuxkpi/common/include/linux/mm_types.h
===================================================================
--- sys/compat/linuxkpi/common/include/linux/mm_types.h
+++ sys/compat/linuxkpi/common/include/linux/mm_types.h
@@ -29,6 +29,7 @@
 
 #include <linux/types.h>
 #include <linux/page.h>
+#include <linux/rbtree.h>
 #include <linux/rwsem.h>
 
 #include <asm/atomic.h>