The kernel extension is really a EXTENDED_DEVOBJ_EXTENSION now
Modified: trunk/reactos/ntoskrnl/io/device.c

Modified: trunk/reactos/ntoskrnl/io/device.c
--- trunk/reactos/ntoskrnl/io/device.c	2005-09-05 08:17:08 UTC (rev 17655)
+++ trunk/reactos/ntoskrnl/io/device.c	2005-09-05 09:25:06 UTC (rev 17656)
@@ -455,7 +455,7 @@
 
     /* Total Size */
     TotalSize = AlignedDeviceExtensionSize +
-                sizeof(DEVICE_OBJECT) + sizeof(DEVOBJ_EXTENSION);
+                sizeof(DEVICE_OBJECT) + sizeof(EXTENDED_DEVOBJ_EXTENSION);
     DPRINT("TotalSize %x\n", TotalSize);
 
     /* Create the Device Object */