On Wed, Nov 19, 2008 at 04:53:47PM -0200, Arnaldo Carvalho de Melo wrote:

Em Wed, Nov 19, 2008 at 10:46:24AM -0800, Paul E. McKenney escreveu:

quoted

For whatever it is worth, here is a more complete use case, on the
off-chance that it becomes useful some time:

	retry:
	rcu_read_lock();

	retry: /* should be here, huh? */

Indeed!  Either that or have an rcu_read_unlock() before the
goto retry.

Good catch!

							Thanx, Paul

quoted

	hlist_nulls_for_each_entry_rcu(tpos, pos, head, hn_node) {
		if (!(curgen = still_valid(tpos)))
			goto retry;
		if (needs_deletion(tpos)) {
			spin_lock(&update_side_lock);
			if (still_valid(tpos) == curgen)
				hlist_nulls_del_init_rcu(pos);
			spin_unlock(&update_side_lock);
		}
	}
	rcu_read_unlock();

- Arnaldo