The NMI entry and exit code fiddles with bits in the preempt count.  If 
an NMI happens while some other code is doing the same, bits will be 
lost.  This patch removes this modify code from the NMI path till we can 
come up with something better.
-- 
George Anzinger   george@mvista.com
HRT (High-res-timers):  http://sourceforge.net/projects/high-res-timers/