hlist_add_before_rcu —
void hlist_add_before_rcu ( | struct hlist_node * | n, |
| struct hlist_node * | next); |
nthe new element to add to the hash list.
nextthe existing element to add the new element before.
Adds the specified element to the specified hlist before the specified node 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.