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net: Introduce possible_net_t

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Having to say
> #ifdef CONFIG_NET_NS
> 	struct net *net;
> #endif

in structures is a little bit wordy and a little bit error prone.

Instead it is possible to say:
> typedef struct {
> #ifdef CONFIG_NET_NS
>       struct net *net;
> #endif
> } possible_net_t;

And then in a header say:

> 	possible_net_t net;

Which is cleaner and easier to use and easier to test, as the
possible_net_t is always there no matter what the compile options.

Further this allows read_pnet and write_pnet to be functions in all
cases which is better at catching typos.

This change adds possible_net_t, updates the definitions of read_pnet
and write_pnet, updates optional struct net * variables that
write_pnet uses on to have the type possible_net_t, and finally fixes
up the b0rked users of read_pnet and write_pnet.

Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric W. Biederman
2015-03-11 23:06:44 -05:00
committed by David S. Miller
parent efd7ef1c19
commit 0c5c9fb551
16 changed files with 43 additions and 73 deletions
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8
include/linux/netdevice.h
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@@ -1721,9 +1721,7 @@ struct net_device {
struct netpoll_info __rcu *npinfo;
#endif
#ifdef CONFIG_NET_NS
struct net *nd_net;
#endif
possible_net_t nd_net;
/* mid-layer private */
union {
@@ -1863,9 +1861,7 @@ struct net *dev_net(const struct net_device *dev)
static inline
void dev_net_set(struct net_device *dev, struct net *net)
{
#ifdef CONFIG_NET_NS
dev->nd_net = net;
#endif
write_pnet(&dev->nd_net, net);
}
static inline bool netdev_uses_dsa(struct net_device *dev)