tag	line	file	source code
No_port	247	net/bridge/br.c	root_port = No_port;
No_port	257	net/bridge/br.c	((root_port == No_port)
No_port	310	net/bridge/br.c	if (root_port == No_port) {      /* (4.6.8.3.2)   */
No_port	584	net/bridge/br.c	bridge_info.root_port = No_port;