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authorPavel Emelyanov <xemul@openvz.org>2007-10-08 23:38:39 -0400
committerDavid S. Miller <davem@sunset.davemloft.net>2007-10-10 19:54:58 -0400
commit4665079cbb2a3e17de82f2ab2940b9f97f37d65e (patch)
tree8e51e9b9e6155eaeccf28783620a07b20a067d8d /fs/proc
parentd62a38d1ab350f787e4941e42a3d3e97971e38f5 (diff)
[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. The exiting functions cannot just reside in the __exit section, as noticed by David, since the init section will have references on it and the compilation will fail due to modpost checks. These references can exist, since the init namespace never dies and the exit callbacks are never called. So I introduce the __exit_refok attribute just like it is already done with the __init_refok. Signed-off-by: Pavel Emelyanov <xemul@openvz.org> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'fs/proc')
-rw-r--r--fs/proc/proc_net.c8
1 files changed, 4 insertions, 4 deletions
diff --git a/fs/proc/proc_net.c b/fs/proc/proc_net.c
index 85cc8e8bb862..2e91fb756e9a 100644
--- a/fs/proc/proc_net.c
+++ b/fs/proc/proc_net.c
@@ -140,7 +140,7 @@ static struct inode_operations proc_net_dir_inode_operations = {
140 .setattr = proc_net_setattr, 140 .setattr = proc_net_setattr,
141}; 141};
142 142
143static int proc_net_ns_init(struct net *net) 143static __net_init int proc_net_ns_init(struct net *net)
144{ 144{
145 struct proc_dir_entry *root, *netd, *net_statd; 145 struct proc_dir_entry *root, *netd, *net_statd;
146 int err; 146 int err;
@@ -178,19 +178,19 @@ free_root:
178 goto out; 178 goto out;
179} 179}
180 180
181static void proc_net_ns_exit(struct net *net) 181static __net_exit void proc_net_ns_exit(struct net *net)
182{ 182{
183 remove_proc_entry("stat", net->proc_net); 183 remove_proc_entry("stat", net->proc_net);
184 remove_proc_entry("net", net->proc_net_root); 184 remove_proc_entry("net", net->proc_net_root);
185 kfree(net->proc_net_root); 185 kfree(net->proc_net_root);
186} 186}
187 187
188struct pernet_operations proc_net_ns_ops = { 188struct pernet_operations __net_initdata proc_net_ns_ops = {
189 .init = proc_net_ns_init, 189 .init = proc_net_ns_init,
190 .exit = proc_net_ns_exit, 190 .exit = proc_net_ns_exit,
191}; 191};
192 192
193int proc_net_init(void) 193int __init proc_net_init(void)
194{ 194{
195 proc_net_shadow = proc_mkdir("net", NULL); 195 proc_net_shadow = proc_mkdir("net", NULL);
196 proc_net_shadow->proc_iops = &proc_net_dir_inode_operations; 196 proc_net_shadow->proc_iops = &proc_net_dir_inode_operations;