SKB_ADJ
skb = dev_alloc_skb(MIN_SKB_SIZE + SKB_ADJ);
u32 r = SKB_ADJ - ((unsigned long)skb->data & SKB_ADJ_MASK);
skb = dev_alloc_skb(size + SKB_ADJ);
u32 r = SKB_ADJ - ((unsigned long)skb->data & SKB_ADJ_MASK);
skb = dev_alloc_skb(MIN_SKB_SIZE + SKB_ADJ);
u32 r = SKB_ADJ - ((unsigned long)skb->data & SKB_ADJ_MASK);