SKB_DATAREF_MASK 537 include/linux/skbuff.h (atomic_read(&skb_shinfo(skb)->dataref) & SKB_DATAREF_MASK) != 1; SKB_DATAREF_MASK 555 include/linux/skbuff.h dataref = (dataref & SKB_DATAREF_MASK) - (dataref >> SKB_DATAREF_SHIFT);