Comment 50 for bug 620074

Could this be a jiffies wraparound bug ?

I've seen different formulas for doing interval arithmetic,
and (not) handling wraparound.

For instance, in as_antic_expired()
::
long delta_jif;

        delta_jif = jiffies - ad->antic_start;
        if (unlikely(delta_jif < 0))
                delta_jif = -delta_jif;
::
, which seems incorrect to me. (it could alter the preditive powers
of the scheduler in mysterious ways ;-)
(A different calculation is performed at other places.)
Jiffies wrap around depending on the HZ value (but still, intervals above INT_MAX should be relatively rare), and the jiffies start value
will cause the first wrap @ 5 min after booting, so that would show.

My 2 cents,
AvK