atm_skb_data
struct atm_skb_data _; /* reserved */
BUILD_BUG_ON(sizeof(skb->cb) < sizeof(struct idt77252_skb_prv) + sizeof(struct atm_skb_data));
struct atm_skb_data atm;
#define ATM_SKB(skb) (((struct atm_skb_data *) (skb)->cb))
memset(ATM_SKB(skb), 0, sizeof(struct atm_skb_data));
memset(ATM_SKB(skb), 0, sizeof(struct atm_skb_data));
memset(ATM_SKB(skb), 0, sizeof(struct atm_skb_data));
memset(ATM_SKB(new_skb), 0, sizeof(struct atm_skb_data));