This code in the csz scheduler, is just plain broken.  The TDIFF_SAFE 
effectively expands to:
	unsigned long delay = now - q->t_c;
	if (delay > 0) {
		delay = 0;
		goto do_reset;
	}
	if (delay >> q->delta_log)

So delay is always 0!  I assume that what was originally intended
is the to keep delay bounded to 1<<q->delta_log. 
Signed-off-by: Stephen Hemminger <shemminger@osdl.org>
Signed-off-by: David S. Miller <davem@redhat.com>