[NET]: Marking struct pernet_operations __net_initdata was inappropriate

It is not safe to to place struct pernet_operations in a special section.
We need struct pernet_operations to last until we call unregister_pernet_subsys.
Which doesn't happen until module unload.

So marking struct pernet_operations is a disaster for modules in two ways.
- We discard it before we call the exit method it points to.
- Because I keep struct pernet_operations on a linked list discarding
  it for compiled in code removes elements in the middle of a linked
  list and does horrible things for linked insert.

So this looks safe assuming __exit_refok is not discarded
for modules.
Signed-off-by: NEric W. Biederman <ebiederm@xmission.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/loopback.c

@@ -284,7 +284,7 @@ static __net_exit void loopback_net_exit(struct net *net)
 	unregister_netdev(dev);
 }
 
-static struct pernet_operations __net_initdata loopback_net_ops = {
+static struct pernet_operations loopback_net_ops = {
        .init = loopback_net_init,
        .exit = loopback_net_exit,
 };

fs/proc/proc_net.c

@@ -185,7 +185,7 @@ static __net_exit void proc_net_ns_exit(struct net *net)
 	kfree(net->proc_net_root);
 }
 
-static struct pernet_operations __net_initdata proc_net_ns_ops = {
+static struct pernet_operations proc_net_ns_ops = {
 	.init = proc_net_ns_init,
 	.exit = proc_net_ns_exit,
 };

include/net/net_namespace.h

@@ -102,11 +102,9 @@ static inline void release_net(struct net *net)
 #ifdef CONFIG_NET_NS
 #define __net_init
 #define __net_exit
-#define __net_initdata
 #else
 #define __net_init	__init
 #define __net_exit	__exit_refok
-#define __net_initdata	__initdata
 #endif
 
 struct pernet_operations {

net/core/dev.c

@@ -2668,7 +2668,7 @@ static void __net_exit dev_proc_net_exit(struct net *net)
 	proc_net_remove(net, "dev");
 }
 
-static struct pernet_operations __net_initdata dev_proc_ops = {
+static struct pernet_operations dev_proc_ops = {
 	.init = dev_proc_net_init,
 	.exit = dev_proc_net_exit,
 };
@@ -4328,7 +4328,7 @@ static void __net_exit netdev_exit(struct net *net)
 	kfree(net->dev_index_head);
 }
 
-static struct pernet_operations __net_initdata netdev_net_ops = {
+static struct pernet_operations  netdev_net_ops = {
 	.init = netdev_init,
 	.exit = netdev_exit,
 };
@@ -4359,7 +4359,7 @@ static void __net_exit default_device_exit(struct net *net)
 	rtnl_unlock();
 }
 
-static struct pernet_operations __net_initdata default_device_ops = {
+static struct pernet_operations  default_device_ops = {
 	.exit = default_device_exit,
 };
 

net/core/dev_mcast.c

@@ -285,7 +285,7 @@ static void __net_exit dev_mc_net_exit(struct net *net)
 	proc_net_remove(net, "dev_mcast");
 }
 
-static struct pernet_operations __net_initdata dev_mc_net_ops = {
+static struct pernet_operations dev_mc_net_ops = {
 	.init = dev_mc_net_init,
 	.exit = dev_mc_net_exit,
 };

net/netlink/af_netlink.c

@@ -1888,7 +1888,7 @@ static void __net_exit netlink_net_exit(struct net *net)
 #endif
 }
 
-static struct pernet_operations __net_initdata netlink_net_ops = {
+static struct pernet_operations netlink_net_ops = {
 	.init = netlink_net_init,
 	.exit = netlink_net_exit,
 };