Hey Andi,
	Just wanted to send this second pass on the x86_64 
generic timekeeping conversion. If you have the time, a quick review 
and comments would be greatly appreciated. 
	
	As this includes a number of changes you suggested, however its likely I missed a few spots.I've made sure the patchset compiles at each stage, and atleast w/ the box I was using it booted each step as well.

If anyone else is interested here, my full timekeeping tree can be 
found here: http://sr71.net/~jstultz/tod/

New in the current C6 release:
o x86-64 cleanups
o arch-trivial patch that converts arches w/o inter-tick resolution
o ia64 cleanups by Peter Keilty

Let me know if you have any thoughts or comments!

thanks again!
-john