UDP_MIN_HEADROOM  234 net/tipc/udp_media.c 	if (skb_headroom(skb) < UDP_MIN_HEADROOM) {
UDP_MIN_HEADROOM  235 net/tipc/udp_media.c 		err = pskb_expand_head(skb, UDP_MIN_HEADROOM, 0, GFP_ATOMIC);