This patch addresses issues of roundoff error in the time keeping and 
NTP code as follows:

The conversion of "actual jiffies" to TICK_USEC and then to TICK_NSEC 
introduced large errors if jiffies was not a power of 10 (e.g. 1024 
for the ia64).  Most of this is avoided by converting directly to 
TICK_NSEC.

The calculation of MAX_SEC_IN_JIFFIES (the largest timespec or timeval 
the kernel will attempt) had overflow problems in the 64-bit machines. 
  We introduce a different equation for those machines.

The NTP frequency update code was allowing a micro second of error to 
accumulate before applying the correction.  We change FINEUSEC to 
FINENSEC to do the correction as soon as a full nanosecond has 
accumulated.

The initial calculation of time_freq for NTP had severe roundoff 
errors for HZ not a power of 10 (i.e. 1024).  A new equation fixes this.

clock_nanosleep is changed to round up to the next jiffie to cover 
starting between jiffies.

(Note, this patch depends on the prior timeclean up patch of this date.)
-- 
George Anzinger   george@mvista.com
High-res-timers:  http://sourceforge.net/projects/high-res-timers/
Preemption patch: http://www.kernel.org/pub/linux/kernel/people/rml