On 05.11.2012 23:28, Russell King - ARM Linux wrote:

It most certainly does handle the wrapping correctly - it was designed
to from the very start.

I'm not an expert on Linux kernel and its core infrastructure,
but how is the sched_clock_timer armed for the first time
after calling setup_sched_clock?

The explicitely called update_sched_clock() does _not_ arm it.

Shawn: could you try change the
  update_sched_clock();
to
  sched_clock_poll(sched_clock_timer.data);
right after update_sched_clock call in setup_sched_clock?

Regards
-- 
                                    Stano