net: Move network device exit batching

[safe/jmp/linux-2.6] / net / core / dev.c

diff --git a/net/core/dev.c b/net/core/dev.c
index e3e18de..0913a08 100644 (file)
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -5766,8 +5766,33 @@ static void __net_exit default_device_exit(struct net *net)
        rtnl_unlock();
 }
 
+static void __net_exit default_device_exit_batch(struct list_head *net_list)
+{
+       /* At exit all network devices most be removed from a network
+        * namespace.  Do this in the reverse order of registeration.
+        * Do this across as many network namespaces as possible to
+        * improve batching efficiency.
+        */
+       struct net_device *dev;
+       struct net *net;
+       LIST_HEAD(dev_kill_list);
+
+       rtnl_lock();
+       list_for_each_entry(net, net_list, exit_list) {
+               for_each_netdev_reverse(net, dev) {
+                       if (dev->rtnl_link_ops)
+                               dev->rtnl_link_ops->dellink(dev, &dev_kill_list);
+                       else
+                               unregister_netdevice_queue(dev, &dev_kill_list);
+               }
+       }
+       unregister_netdevice_many(&dev_kill_list);
+       rtnl_unlock();
+}
+
 static struct pernet_operations __net_initdata default_device_ops = {
        .exit = default_device_exit,
+       .exit_batch = default_device_exit_batch,
 };
 
 /*