1)Accessing the component nh of composite nh only if it has valid flag 2...

...)Doing a vr_delay_op() while modifying the nh flags 3) Decrementing the reference count of nh_dev in nh while making the nh invalid 4) Marking the skb->ip_summed to CHECKSUM_UNNECESSARY for l2 packets received on Physical if checksum is partial 5) code alignment