static void sfb_swap_slot(struct sfb_sched_data *q)
{
	sfb_init_perturbation(q->slot, q);
	q->slot ^= 1;
	q->double_buffering = false;
}
static void sfb_swap_slot(struct sfb_sched_data *q)
{
	sfb_init_perturbation(q->slot, q);
	q->slot ^= 1;
	q->double_buffering = false;
}