Author: Bhaktipriya Shridhar <bhaktipriya96@gmail.com> The pointer *skb2 is declared ‘globally’ inside ifdef NOT_YET. It’s used nowhere in the directory. Another pointer *skb2 is declared ‘locally’, again inside another ifdef NOT_YET in the function ieee80211_rx_frame_mgmt. Hence, skb2 stays unused and has been removed. This was done using Coccinelle: @@ type T; identifier i; constant c; @@ …