Index: sys/compat/linuxkpi/common/include/linux/kref.h
===================================================================
--- sys/compat/linuxkpi/common/include/linux/kref.h
+++ sys/compat/linuxkpi/common/include/linux/kref.h
@@ -38,6 +38,7 @@
 #include <linux/compiler.h>
 #include <linux/kernel.h>
 #include <linux/mutex.h>
+#include <linux/refcount.h>
 
 #include <asm/atomic.h>
 
@@ -77,6 +78,20 @@
 	return 0;
 }
 
+static inline int
+kref_put_lock(struct kref *kref, void (*rel)(struct kref *kref),
+    spinlock_t *lock)
+{
+
+	if (refcount_release(&kref->refcount.counter)) {
+		spin_lock(lock);
+		rel(kref);
+		return (1);
+	}
+	return (0);
+}
+
+
 static inline int
 kref_sub(struct kref *kref, unsigned int count,
     void (*rel)(struct kref *kref))
Index: sys/compat/linuxkpi/common/include/linux/wait.h
===================================================================
--- sys/compat/linuxkpi/common/include/linux/wait.h
+++ sys/compat/linuxkpi/common/include/linux/wait.h
@@ -36,6 +36,7 @@
 #include <linux/compiler.h>
 #include <linux/list.h>
 #include <linux/spinlock.h>
+#include <linux/bitops.h>
 
 #include <asm/atomic.h>
 
@@ -286,15 +287,36 @@
 
 void linux_wake_up_bit(void *, int);
 int linux_wait_on_bit_timeout(unsigned long *, int, unsigned int, int);
+wait_queue_head_t *linux_bit_waitqueue(void *, int);
 void linux_wake_up_atomic_t(atomic_t *);
 int linux_wait_on_atomic_t(atomic_t *, unsigned int);
 
+static inline void wake_up_var(void *var)
+{
+	
+}
+
+static inline int wait_var_event_killable(void *var, int cond)
+{
+	return (0);
+}
+
 #define	wake_up_bit(word, bit)		linux_wake_up_bit(word, bit)
 #define	wait_on_bit(word, bit, state)					\
 	linux_wait_on_bit_timeout(word, bit, state, MAX_SCHEDULE_TIMEOUT)
 #define	wait_on_bit_timeout(word, bit, state, timeout)			\
 	linux_wait_on_bit_timeout(word, bit, state, timeout)
+#define	bit_waitqueue(word, bit)	linux_bit_waitqueue(word, bit)
 #define	wake_up_atomic_t(a)		linux_wake_up_atomic_t(a)
+
+static inline void
+clear_and_wake_up_bit(int bit, void *word)
+{
+	clear_bit_unlock(bit, word);
+	wmb();
+	wake_up_bit(word, bit);
+}
+
 /*
  * All existing callers have a cb that just schedule()s. To avoid adding
  * complexity, just emulate that internally. The prototype is different so that
Index: sys/compat/linuxkpi/common/src/linux_schedule.c
===================================================================
--- sys/compat/linuxkpi/common/src/linux_schedule.c
+++ sys/compat/linuxkpi/common/src/linux_schedule.c
@@ -357,6 +357,12 @@
 	wake_up_sleepers(bit_to_wchan(word, bit));
 }
 
+wait_queue_head_t *
+linux_bit_waitqueue(void *word, int bit)
+{
+	return (bit_to_wchan(word, bit));
+}
+
 int
 linux_wait_on_bit_timeout(unsigned long *word, int bit, unsigned int state,
     int timeout)