RECVBUFF_ALIGN_SZ
precvbuf->pskb = __dev_alloc_skb(MAX_RECVBUF_SZ + RECVBUFF_ALIGN_SZ, GFP_ATOMIC);
alignment = tmpaddr & (RECVBUFF_ALIGN_SZ-1);
skb_reserve(precvbuf->pskb, (RECVBUFF_ALIGN_SZ - alignment));
recvbuf->pskb = __dev_alloc_skb(MAX_RECVBUF_SZ + RECVBUFF_ALIGN_SZ, GFP_ATOMIC);
alignment = tmpaddr & (RECVBUFF_ALIGN_SZ - 1);
skb_reserve(recvbuf->pskb, (RECVBUFF_ALIGN_SZ - alignment));