kernel/bpf/ringbuf.c

298 	unsigned long cons_pos, prod_pos;
300 	cons_pos = smp_load_acquire(&rb->consumer_pos);
302 	return prod_pos - cons_pos;
407 	unsigned long cons_pos, prod_pos, new_prod_pos, flags;
418 	cons_pos = smp_load_acquire(&rb->consumer_pos);
433 	if (new_prod_pos - cons_pos > rb->mask) {
472 	unsigned long rec_pos, cons_pos;
490 	cons_pos = smp_load_acquire(&rb->consumer_pos) & rb->mask;
494 	else if (cons_pos == rec_pos && !(flags & BPF_RB_NO_WAKEUP))
661 	u64 cons_pos, prod_pos;
669 	cons_pos = smp_load_acquire(&rb->consumer_pos);
670 	if (cons_pos >= prod_pos)
673 	hdr = (u32 *)((uintptr_t)rb->data + (uintptr_t)(cons_pos & rb->mask));
681 	if (total_len > prod_pos - cons_pos)
699 		smp_store_release(&rb->consumer_pos, cons_pos + total_len);
707 			   (uintptr_t)((cons_pos + BPF_RINGBUF_HDR_SZ) & rb->mask));