RFCOMM_SKB_RESERVE 576 net/bluetooth/rfcomm/sock.c skb = sock_alloc_send_skb(sk, size + RFCOMM_SKB_RESERVE, RFCOMM_SKB_RESERVE 783 net/bluetooth/rfcomm/tty.c skb = rfcomm_wmalloc(dev, size + RFCOMM_SKB_RESERVE, GFP_ATOMIC);