With this patch, /sbin/hwclock no longer hangs my AMD64 machine when run 
after reaching multiuser.  What I don't understand is why.  I have the 
RTC based sound sequencer timer as a module, but not loaded, and the 
error message I added to indicate broken rtc control does not fire.

So why is it that if I stop taking the rtc_task_lock and issuing the 
callbacks which should never be held or exist that my system no longer 
hard freezes?

Zach