Add hlist_add_tail_rcu() (Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net)

		first->pprev = &n->next;

}

/**

 * hlist_add_tail_rcu

 * @n: the element to add to the hash list.

 * @h: the list to add to.

 *

 * Description:

 * Adds the specified element to the specified hlist,

 * while permitting racing traversals.

 *

 * The caller must take whatever precautions are necessary

 * (such as holding appropriate locks) to avoid racing

 * with another list-mutation primitive, such as hlist_add_head_rcu()

 * or hlist_del_rcu(), running on this same list.

 * However, it is perfectly legal to run concurrently with

 * the _rcu list-traversal primitives, such as

 * hlist_for_each_entry_rcu(), used to prevent memory-consistency

 * problems on Alpha CPUs.  Regardless of the type of CPU, the

 * list-traversal primitive must be guarded by rcu_read_lock().

 */

static inline void hlist_add_tail_rcu(struct hlist_node *n,

				      struct hlist_head *h)

{

	struct hlist_node *i, *last = NULL;

	for (i = hlist_first_rcu(h); i; i = hlist_next_rcu(i))

		last = i;

	if (last) {

		n->next = last->next;

		n->pprev = &last->next;

		rcu_assign_pointer(hlist_next_rcu(last), n);

	} else {

		hlist_add_head_rcu(n, h);

	}

}

/**

 * hlist_add_before_rcu

 * @n: the new element to add to the hash list.