peer_head
unsigned short call_head, conn_head, peer_head;
peer_head = smp_load_acquire(&b->peer_backlog_head);
ASSERTCMP(CIRC_CNT(peer_head, peer_tail, RXRPC_BACKLOG_MAX), >=,
head = peer_head(prev);
head = peer_head(peer);
head = peer_head(peer);
mon_assign_roles(mon, peer_head(peer));