/* These elements must be at the end, see alloc_skb() for details.  */
-	unsigned int		truesize;
+	unsigned int		truesize, __tsize;

There is no real need for new member.

-		kfree(skb->head);
+		avl_free(skb->head, skb->__tsize);

Just use "skb->end - skb->head + sizeof(struct skb_shared_info)"
as the size argument.

Then, there is no reason for skb->__tsize :-)

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