kernel/bpf/ringbuf.c

297 	unsigned long cons_pos, prod_pos;
299 	cons_pos = smp_load_acquire(&rb->consumer_pos);
301 	return prod_pos - cons_pos;
406 	unsigned long cons_pos, prod_pos, new_prod_pos, pend_pos, flags;
417 	cons_pos = smp_load_acquire(&rb->consumer_pos);
447 	if (new_prod_pos - cons_pos > rb->mask ||
487 	unsigned long rec_pos, cons_pos;
505 	cons_pos = smp_load_acquire(&rb->consumer_pos) & rb->mask;
509 	else if (cons_pos == rec_pos && !(flags & BPF_RB_NO_WAKEUP))
676 	u64 cons_pos, prod_pos;
684 	cons_pos = smp_load_acquire(&rb->consumer_pos);
685 	if (cons_pos >= prod_pos)
688 	hdr = (u32 *)((uintptr_t)rb->data + (uintptr_t)(cons_pos & rb->mask));
696 	if (total_len > prod_pos - cons_pos)
714 		smp_store_release(&rb->consumer_pos, cons_pos + total_len);
722 			   (uintptr_t)((cons_pos + BPF_RINGBUF_HDR_SZ) & rb->mask));