[PATCH 2/5] Relax the reference counting of init_net_ns

!MAILaRCHIVE_VOTE_RePLACE
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To: David Miller <davem@...>
Cc: Linux Netdev List <netdev@...>, Eric W. Biederman <ebiederm@...>, <devel@...>
Date: Wednesday, October 31, 2007 - 3:25 pm

When the CONFIG_NET_NS is n there's no need in refcounting
the initial net namespace. So relax this code by making a
stupid stubs for the "n" case.

Signed-off-by: Pavel Emelyanov <xemul@openvz.org>

---

diff --git a/include/net/net_namespace.h b/include/net/net_namespace.h
index 5279466..1fd449a 100644
--- a/include/net/net_namespace.h
+++ b/include/net/net_namespace.h
@@ -51,13 +51,12 @@ static inline struct net *copy_net_ns(unsigned long flags, struct net *net_ns)
 }
 #endif
 
+#ifdef CONFIG_NET_NS
 extern void __put_net(struct net *net);
 
 static inline struct net *get_net(struct net *net)
 {
-#ifdef CONFIG_NET
 	atomic_inc(&net->count);
-#endif
 	return net;
 }
 
@@ -75,26 +74,44 @@ static inline struct net *maybe_get_net(struct net *net)
 
 static inline void put_net(struct net *net)
 {
-#ifdef CONFIG_NET
 	if (atomic_dec_and_test(&net->count))
 		__put_net(net);
-#endif
 }
 
 static inline struct net *hold_net(struct net *net)
 {
-#ifdef CONFIG_NET
 	atomic_inc(&net->use_count);
-#endif
 	return net;
 }
 
 static inline void release_net(struct net *net)
 {
-#ifdef CONFIG_NET
 	atomic_dec(&net->use_count);
-#endif
 }
+#else
+static inline struct net *get_net(struct net *net)
+{
+	return net;
+}
+
+static inline void put_net(struct net *net)
+{
+}
+
+static inline struct net *hold_net(struct net *net)
+{
+	return net;
+}
+
+static inline void release_net(struct net *net)
+{
+}
+
+static inline struct net *maybe_get_net(struct net *net)
+{
+	return net;
+}
+#endif
 
 #define for_each_net(VAR)				\
 	list_for_each_entry(VAR, &net_namespace_list, list)
-- 
1.5.3.4

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Messages in current thread:
[PATCH 0/5] Make nicer CONFIG_NET_NS=n case code, Pavel Emelyanov, (Wed Oct 31, 3:19 pm)
Re: [PATCH 0/5] Make nicer CONFIG_NET_NS=n case code, Daniel Lezcano, (Wed Oct 31, 5:37 pm)
Re: [PATCH 0/5] Make nicer CONFIG_NET_NS=n case code, Eric Dumazet, (Wed Oct 31, 2:49 pm)
Re: [PATCH 0/5] Make nicer CONFIG_NET_NS=n case code, Eric W. Biederman, (Wed Oct 31, 6:05 pm)
Re: [PATCH 0/5] Make nicer CONFIG_NET_NS=n case code, Eric Dumazet, (Wed Oct 31, 6:40 pm)
Re: [PATCH 0/5] Make nicer CONFIG_NET_NS=n case code, Eric W. Biederman, (Wed Oct 31, 8:51 pm)
Re: [PATCH 0/5] Make nicer CONFIG_NET_NS=n case code, Eric Dumazet, (Thu Nov 1, 2:58 am)
Re: [PATCH 0/5] Make nicer CONFIG_NET_NS=n case code, David Miller, (Thu Nov 1, 3:02 am)
Re: [PATCH 0/5] Make nicer CONFIG_NET_NS=n case code, David Miller, (Wed Oct 31, 7:31 pm)
Re: [PATCH 0/5] Make nicer CONFIG_NET_NS=n case code, Eric W. Biederman, (Wed Oct 31, 8:58 pm)
Re: [PATCH 0/5] Make nicer CONFIG_NET_NS=n case code, Daniel Lezcano, (Wed Oct 31, 5:35 pm)
[PATCH 5/5] Hide the net_ns kmem cache, Pavel Emelyanov, (Wed Oct 31, 3:32 pm)
Re: [PATCH 5/5] Hide the net_ns kmem cache, David Miller, (Thu Nov 1, 3:47 am)
[PATCH 4/5] Mark the setup_net as __net_init, Pavel Emelyanov, (Wed Oct 31, 3:31 pm)
Re: [PATCH 4/5] Mark the setup_net as __net_init, David Miller, (Thu Nov 1, 3:46 am)
[PATCH 3/5] Hide the dead code in the net_namespace.c, Pavel Emelyanov, (Wed Oct 31, 3:28 pm)
[PATCH 2/5] Relax the reference counting of init_net_ns, Pavel Emelyanov, (Wed Oct 31, 3:25 pm)