aal5_size
APRINTK(pdusize == aal5_size(skb->len),
pdusize, aal5_size(skb->len));
n = aal5_size(skb->len);
n = aal5_size(skb->len);
if (unlikely(n != aal5_size(size))) {
max_sdu = aal5_size(max_sdu);