--- xnu/xnu-201.5/iokit/Kernel/IOMultiMemoryDescriptor.cpp
+++ xnu/xnu-124.7/iokit/Kernel/IOMultiMemoryDescriptor.cpp
@@ -289,34 +289,6 @@
 
 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 
-IOPhysicalAddress IOMultiMemoryDescriptor::getSourceSegment(
-                                                       IOByteCount   offset,
-                                                       IOByteCount * length )
-{
-    //
-    // This method returns the physical address of the byte at the given offset
-    // into the memory,  and optionally the length of the physically contiguous
-    // segment from that offset.
-    //
-
-    assert(offset <= _length);
-
-    for ( unsigned index = 0; index < _descriptorsCount; index++ ) 
-    {
-        if ( offset < _descriptors[index]->getLength() )
-        {
-            return _descriptors[index]->getSourceSegment(offset, length);
-        }
-        offset -= _descriptors[index]->getLength();
-    }
-
-    if ( length )  *length = 0;
-
-    return 0;
-}
-
-// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
-
 void * IOMultiMemoryDescriptor::getVirtualSegment( IOByteCount   /* offset */ ,
                                                    IOByteCount * /* length */ )
 {