--- xnu/xnu-517.7.21/iokit/Kernel/IOEventSource.cpp
+++ xnu/xnu-201.19/iokit/Kernel/IOEventSource.cpp
@@ -43,18 +43,8 @@
 OSMetaClassDefineReservedUnused(IOEventSource, 6);
 OSMetaClassDefineReservedUnused(IOEventSource, 7);
 
-/* inline function implementations */
-void IOEventSource::signalWorkAvailable()	{ workLoop->signalWorkAvailable(); }
-void IOEventSource::openGate()			{ workLoop->openGate(); }
-void IOEventSource::closeGate()			{ workLoop->closeGate(); }
-bool IOEventSource::tryCloseGate()		{ return workLoop->tryCloseGate(); }
-int IOEventSource::sleepGate(void *event, UInt32 type)
-        { return workLoop->sleepGate(event, type); }
-void IOEventSource::wakeupGate(void *event, bool oneThread)
-        { workLoop->wakeupGate(event, oneThread); }
-
 bool IOEventSource::init(OSObject *inOwner,
-                         Action inAction)
+                         Action inAction = 0)
 {
     if (!inOwner)
         return false;