From: john stultz <johnstul@us.ibm.com>

In developing the ia64-cyclone patch, which implements a cyclone based time
interpolator, I found the following bug which could cause time
inconsistencies.

In update_wall_time_one_tick(), which is called each timer interrupt, we
call time_interpolator_update(delta_nsec) where delta_nsec is approximately
NSEC_PER_SEC/HZ.  This directly correlates with the changes to xtime which
occurs in update_wall_time_one_tick().

However in update_wall_time(), on a second overflow, we again call
time_interpolator_update(NSEC_PER_SEC).  However while the components of
xtime are being changed, the overall value of xtime does not (nsec is
decremented NSEC_PER_SEC and sec is incremented).  Thus this call to
time_interpolator_update is incorrect.

This patch removes the incorrect call to time_interpolator_update and was
found to resolve the time inconsistencies I had seen while developing the
ia64-cyclone patch.