static unsigned long ringbuf_avail_data_sz(struct bpf_ringbuf *rb)
{
	unsigned long cons_pos, prod_pos;

	cons_pos = smp_load_acquire(&rb->consumer_pos);
	prod_pos = smp_load_acquire(&rb->producer_pos);
	return prod_pos - cons_pos;
}
static unsigned long ringbuf_avail_data_sz(struct bpf_ringbuf *rb)
{
	unsigned long cons_pos, prod_pos;

	cons_pos = smp_load_acquire(&rb->consumer_pos);
	prod_pos = smp_load_acquire(&rb->producer_pos);
	return prod_pos - cons_pos;
}