extra_head       3429 net/mac80211/tx.c 	int extra_head = fast_tx->hdr_len - (ETH_HLEN - 2);
extra_head       3483 net/mac80211/tx.c 					  max_t(int, extra_head + hw_headroom -
extra_head       3491 net/mac80211/tx.c 	hdr = skb_push(skb, extra_head);