[NET] NETNS: Omit net_device->nd_net without CONFIG_NET_NS.

Introduce per-net_device inlines: dev_net(), dev_net_set().
Without CONFIG_NET_NS, no namespace other than &init_net exists.
Let's explicitly define them to help compiler optimizations.

Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>

1 files changed, 24 insertions, 1 deletions

diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index ced61f87660e..d146be40f46c 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -708,8 +708,10 @@ struct net_device
         void                    (*poll_controller)(struct net_device *dev);
 #endif
 
+#ifdef CONFIG_NET_NS
         /* Network namespace this network device is inside */
         struct net              *nd_net;
+#endif
 
         /* bridge stuff */
         struct net_bridge_port  *br_port;
@@ -737,6 +739,27 @@ struct net_device
 #define NETDEV_ALIGN            32
 #define NETDEV_ALIGN_CONST      (NETDEV_ALIGN - 1)
 
+/*
+ * Net namespace inlines
+ */
+static inline
+struct net *dev_net(const struct net_device *dev)
+{
+#ifdef CONFIG_NET_NS
+        return dev->nd_net;
+#else
+        return &init_net;
+#endif
+}
+
+static inline
+void dev_net_set(struct net_device *dev, const struct net *net)
+{
+#ifdef CONFIG_NET_NS
+        dev->nd_dev = net;
+#endif
+}
+
 /**
  *      netdev_priv - access network device private data
  *      @dev: network device
@@ -813,7 +836,7 @@ static inline struct net_device *next_net_device(struct net_device *dev)
         struct list_head *lh;
         struct net *net;
 
-        net = dev->nd_net;
+        net = dev_net(dev);
         lh = dev->dev_list.next;
         return lh == &net->dev_base_head ? NULL : net_device_entry(lh);
 }