net: Add more comments
This adds comments to different places to improve
readability.
Signed-off-by: Kirill Tkhai <ktkhai@virtuozzo.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/net/net_namespace.h b/include/net/net_namespace.h
index 922e8b6..1ab4f92 100644
--- a/include/net/net_namespace.h
+++ b/include/net/net_namespace.h
@@ -323,6 +323,10 @@ struct pernet_operations {
* have to keep in mind all other pernet_operations and
* to introduce a locking, if they share common resources.
*
+ * The only time they are called with exclusive lock is
+ * from register_pernet_subsys(), unregister_pernet_subsys()
+ * register_pernet_device() and unregister_pernet_device().
+ *
* Exit methods using blocking RCU primitives, such as
* synchronize_rcu(), should be implemented via exit_batch.
* Then, destruction of a group of net requires single