NS_HBUFSIZE
hb = dev_alloc_skb(NS_HBUFSIZE);
dev_alloc_skb(NS_HBUFSIZE)) !=
dev_alloc_skb(NS_HBUFSIZE)) != NULL) {
dev_alloc_skb(NS_HBUFSIZE)) !=
hb = __dev_alloc_skb(NS_HBUFSIZE, GFP_KERNEL);
hb = __dev_alloc_skb(NS_HBUFSIZE, GFP_KERNEL);