list_for_each_entry_rcu - iterate over rcu list of given type
list_for_each_entry_rcu (pos, head, member);
pos the type * to use as a loop counter. head the head for your list. member the name of the list_struct within the struct.
This list-traversal primitive may safely run concurrently with the _rcu list-mutation primitives such as list_add_rcu as long as the traversal is guarded by rcu_read_lock.