--- xnu/xnu-3789.31.2/iokit/Kernel/IOLocks.cpp
+++ xnu/xnu-4570.41.2/iokit/Kernel/IOLocks.cpp
@@ -80,6 +80,7 @@
 	thread_wakeup_prim((event_t) event, oneThread, THREAD_AWAKENED);
 }   
 
+
 #if defined(__x86_64__)
 /*
  * For backwards compatibility, kexts built against pre-Darwin 14 headers will bind at runtime to this function,
@@ -308,6 +309,30 @@
     return( (lck_spin_t *)lock);
 }
 
+#ifndef IOLOCKS_INLINE
+/*
+ * Lock assertions
+ */
+
+void
+IOLockAssert(IOLock * lock, IOLockAssertState type)
+{
+    LCK_MTX_ASSERT(lock, type);
+}
+
+void
+IORWLockAssert(IORWLock * lock, IORWLockAssertState type)
+{
+    LCK_RW_ASSERT(lock, type);
+}
+
+void
+IOSimpleLockAssert(IOSimpleLock *lock, IOSimpleLockAssertState type)
+{
+    LCK_SPIN_ASSERT(l, type);
+}
+#endif /* !IOLOCKS_INLINE */
+
 } /* extern "C" */