net: Introduce read_pnet() and write_pnet() helpers
This patch introduces two helpers that deal with reading and writing
struct net pointers in various network structures.
Their implementation depends on CONFIG_NET_NS
For symmetry, both functions work with "struct net **pnet".
Their usage should reduce the number of #ifdef CONFIG_NET_NS,
without adding many helpers for each network structure
that hold a "struct net *pointer"
Signed-off-by: Eric Dumazet <dada1@cosmosbay.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 700c53a..3195577 100644
--- a/include/net/net_namespace.h
+++ b/include/net/net_namespace.h
@@ -192,6 +192,24 @@
}
#endif
+#ifdef CONFIG_NET_NS
+
+static inline void write_pnet(struct net **pnet, struct net *net)
+{
+ *pnet = net;
+}
+
+static inline struct net *read_pnet(struct net * const *pnet)
+{
+ return *pnet;
+}
+
+#else
+
+#define write_pnet(pnet, net) do { (void)(net);} while (0)
+#define read_pnet(pnet) (&init_net)
+
+#endif
#define for_each_net(VAR) \
list_for_each_entry(VAR, &net_namespace_list, list)