> @@ -3068,6 +3071,11 @@ EXPORT_SYMBOL_GPL(cgroup_next_descendant_pre);
> * Return the rightmost descendant of @pos. If there's no descendant,
> * @pos is returned. This can be used during pre-order traversal to skip
> * subtree of @pos.
> + *
> + * While this function requires RCU read locking, it doesn't require the
> + * whole traversal to be contained in a single RCU critical section. This
> + * function will return the correct rightmost descendant as long as @pos is
> + * accessible.
> */
> struct cgroup *cgroup_rightmost_descendant(struct cgroup *pos)
> {
Forgot to convert cgroup_rightmost_descendat() to use cgroup_next_sibling()?
do {
last = pos;
/* ->prev isn't RCU safe, walk ->next till the end */
pos = NULL;
list_for_each_entry_rcu(tmp, &last->children, sibling)
pos = tmp;
} while (pos);
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