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Message-ID: <4704F083.7090203@openvz.org>
Date: Thu, 04 Oct 2007 17:54:11 +0400
From: Pavel Emelyanov <xemul@...nvz.org>
To: David Miller <davem@...emloft.net>
CC: "Eric W. Biederman" <ebiederm@...ssion.com>,
Linux Netdev List <netdev@...r.kernel.org>, devel@...nvz.org
Subject: [PATCH][NETNS] Move some code into __init section when CONFIG_NET_NS=n
With the net namespaces many code leaved the __init section,
thus making the kernel occupy more memory than it did before.
Since we have a config option that prohibits the namespace
creation, the functions that initialize/finalize some netns
stuff are simply not needed and can be freed after the boot.
Currently, this is almost not noticeable, since few calls
are no longer in __init, but when the namespaces will be
merged it will be possible to free more code. I propose to
use the __net_init, __net_exit and __net_initdata "attributes"
for functions/variables that are not used if the CONFIG_NET_NS
is not set to save more space in memory.
Signed-off-by: Pavel Emelyanov <xemul@...nvz.org>
---
diff --git a/include/net/net_namespace.h b/include/net/net_namespace.h
index 934c840..747170f 100644
--- a/include/net/net_namespace.h
+++ b/include/net/net_namespace.h
@@ -99,6 +99,15 @@ static inline void release_net(struct ne
#define for_each_net(VAR) \
list_for_each_entry(VAR, &net_namespace_list, list)
+#ifdef CONFIG_NET_NS
+#define __net_init
+#define __net_exit
+#define __net_initdata
+#else
+#define __net_init __init
+#define __net_exit __exit
+#define __net_initdata __initdata
+#endif
struct pernet_operations {
struct list_head list;
diff --git a/drivers/net/loopback.c b/drivers/net/loopback.c
index d6997ae..be25aa3 100644
--- a/drivers/net/loopback.c
+++ b/drivers/net/loopback.c
@@ -250,7 +250,7 @@ static void loopback_setup(struct net_de
}
/* Setup and register the loopback device. */
-static int loopback_net_init(struct net *net)
+static __net_init int loopback_net_init(struct net *net)
{
struct net_device *dev;
int err;
@@ -278,14 +278,14 @@ out_free_netdev:
goto out;
}
-static void loopback_net_exit(struct net *net)
+static __net_exit void loopback_net_exit(struct net *net)
{
struct net_device *dev = net->loopback_dev;
unregister_netdev(dev);
}
-static struct pernet_operations loopback_net_ops = {
+static struct pernet_operations __net_initdata loopback_net_ops = {
.init = loopback_net_init,
.exit = loopback_net_exit,
};
diff --git a/fs/proc/proc_net.c b/fs/proc/proc_net.c
index 85cc8e8..2e91fb7 100644
--- a/fs/proc/proc_net.c
+++ b/fs/proc/proc_net.c
@@ -140,7 +140,7 @@ static struct inode_operations proc_net_
.setattr = proc_net_setattr,
};
-static int proc_net_ns_init(struct net *net)
+static __net_init int proc_net_ns_init(struct net *net)
{
struct proc_dir_entry *root, *netd, *net_statd;
int err;
@@ -178,19 +178,19 @@ free_root:
goto out;
}
-static void proc_net_ns_exit(struct net *net)
+static __net_exit void proc_net_ns_exit(struct net *net)
{
remove_proc_entry("stat", net->proc_net);
remove_proc_entry("net", net->proc_net_root);
kfree(net->proc_net_root);
}
-struct pernet_operations proc_net_ns_ops = {
+struct pernet_operations __net_initdata proc_net_ns_ops = {
.init = proc_net_ns_init,
.exit = proc_net_ns_exit,
};
-int proc_net_init(void)
+int __init proc_net_init(void)
{
proc_net_shadow = proc_mkdir("net", NULL);
proc_net_shadow->proc_iops = &proc_net_dir_inode_operations;
diff --git a/net/core/dev.c b/net/core/dev.c
index d998646..37f8858 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -2611,7 +2611,7 @@ static const struct file_operations ptyp
};
-static int dev_proc_net_init(struct net *net)
+static int __net_init dev_proc_net_init(struct net *net)
{
int rc = -ENOMEM;
@@ -2636,7 +2636,7 @@ out_dev:
goto out;
}
-static void dev_proc_net_exit(struct net *net)
+static void __net_exit dev_proc_net_exit(struct net *net)
{
wext_proc_exit(net);
@@ -2645,7 +2645,7 @@ static void dev_proc_net_exit(struct net
proc_net_remove(net, "dev");
}
-static struct pernet_operations dev_proc_ops = {
+static struct pernet_operations __net_initdata dev_proc_ops = {
.init = dev_proc_net_init,
.exit = dev_proc_net_exit,
};
@@ -4250,7 +4250,7 @@ static struct hlist_head *netdev_create_
}
/* Initialize per network namespace state */
-static int netdev_init(struct net *net)
+static int __net_init netdev_init(struct net *net)
{
INIT_LIST_HEAD(&net->dev_base_head);
rwlock_init(&dev_base_lock);
@@ -4271,18 +4271,18 @@ err_name:
return -ENOMEM;
}
-static void netdev_exit(struct net *net)
+static void __net_exit netdev_exit(struct net *net)
{
kfree(net->dev_name_head);
kfree(net->dev_index_head);
}
-static struct pernet_operations netdev_net_ops = {
+static struct pernet_operations __net_initdata netdev_net_ops = {
.init = netdev_init,
.exit = netdev_exit,
};
-static void default_device_exit(struct net *net)
+static void __net_exit default_device_exit(struct net *net)
{
struct net_device *dev, *next;
/*
@@ -4308,7 +4308,7 @@ static void default_device_exit(struct n
rtnl_unlock();
}
-static struct pernet_operations default_device_ops = {
+static struct pernet_operations __net_initdata default_device_ops = {
.exit = default_device_exit,
};
diff --git a/net/core/dev_mcast.c b/net/core/dev_mcast.c
index 896b0ca..15241cf 100644
--- a/net/core/dev_mcast.c
+++ b/net/core/dev_mcast.c
@@ -273,19 +273,19 @@ static const struct file_operations dev_
#endif
-static int dev_mc_net_init(struct net *net)
+static int __net_init dev_mc_net_init(struct net *net)
{
if (!proc_net_fops_create(net, "dev_mcast", 0, &dev_mc_seq_fops))
return -ENOMEM;
return 0;
}
-static void dev_mc_net_exit(struct net *net)
+static void __net_exit dev_mc_net_exit(struct net *net)
{
proc_net_remove(net, "dev_mcast");
}
-static struct pernet_operations dev_mc_net_ops = {
+static struct pernet_operations __net_initdata dev_mc_net_ops = {
.init = dev_mc_net_init,
.exit = dev_mc_net_exit,
};
diff --git a/net/netlink/af_netlink.c b/net/netlink/af_netlink.c
index 46eb5ea..3ef3282 100644
--- a/net/netlink/af_netlink.c
+++ b/net/netlink/af_netlink.c
@@ -1924,7 +1924,7 @@ static struct net_proto_family netlink_f
.owner = THIS_MODULE, /* for consistency 8) */
};
-static int netlink_net_init(struct net *net)
+static int __net_init netlink_net_init(struct net *net)
{
#ifdef CONFIG_PROC_FS
if (!proc_net_fops_create(net, "netlink", 0, &netlink_seq_fops))
@@ -1933,14 +1933,14 @@ static int netlink_net_init(struct net *
return 0;
}
-static void netlink_net_exit(struct net *net)
+static void __net_exit netlink_net_exit(struct net *net)
{
#ifdef CONFIG_PROC_FS
proc_net_remove(net, "netlink");
#endif
}
-static struct pernet_operations netlink_net_ops = {
+static struct pernet_operations __net_initdata netlink_net_ops = {
.init = netlink_net_init,
.exit = netlink_net_exit,
};
-
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