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authorTejun Heo <tj@kernel.org>2014-02-08 19:36:58 +0400
committerTejun Heo <tj@kernel.org>2014-02-08 19:36:58 +0400
commitaf6363374cbda5007e46efa99f7346efd4eea5fc (patch)
tree413959c968a55bbe8f2592a82b9cc6e13308f508
parent38dbfb59d1175ef458d006556061adeaa8751b72 (diff)
downloadlinux-af6363374cbda5007e46efa99f7346efd4eea5fc.tar.xz
cgroup: make CONFIG_CGROUP_NET_PRIO bool and drop unnecessary init_netclassid_cgroup()
net_prio is the only cgroup which is allowed to be built as a module. The savings from allowing one controller to be built as a module are tiny especially given that cgroup module support itself adds quite a bit of complexity. Given that none of other controllers has much chance of being made a module and that we're unlikely to add new modular controllers, the added complexity is simply not justifiable. As a first step to drop cgroup module support, this patch changes the config option to bool from tristate and drops module related code from it. Also, while an earlier commit fe1217c4f3f7 ("net: net_cls: move cgroupfs classid handling into core") dropped module support from net_cls cgroup, it retained a call to cgroup_load_subsys(), which is noop for built-in controllers. Drop it along with init_netclassid_cgroup(). v2: Removed modular version of task_netprioidx() in include/net/netprio_cgroup.h as suggested by Li Zefan. v3: Rebased on top of fe1217c4f3f7 ("net: net_cls: move cgroupfs classid handling into core"). net_cls cgroup part is mostly dropped except for removal of init_netclassid_cgroup(). Signed-off-by: Tejun Heo <tj@kernel.org> Acked-by: Neil Horman <nhorman@tuxdriver.com> Acked-by: "David S. Miller" <davem@davemloft.net> Acked-by: Li Zefan <lizefan@huawei.com> Cc: Thomas Graf <tgraf@suug.ch>
-rw-r--r--include/net/netprio_cgroup.h15
-rw-r--r--net/Kconfig2
-rw-r--r--net/core/netclassid_cgroup.c6
-rw-r--r--net/core/netprio_cgroup.c32
4 files changed, 3 insertions, 52 deletions
diff --git a/include/net/netprio_cgroup.h b/include/net/netprio_cgroup.h
index dafc09f0fdbc..b7ff5bd3c3c3 100644
--- a/include/net/netprio_cgroup.h
+++ b/include/net/netprio_cgroup.h
@@ -27,7 +27,6 @@ struct netprio_map {
void sock_update_netprioidx(struct sock *sk);
-#if IS_BUILTIN(CONFIG_CGROUP_NET_PRIO)
static inline u32 task_netprioidx(struct task_struct *p)
{
struct cgroup_subsys_state *css;
@@ -39,20 +38,6 @@ static inline u32 task_netprioidx(struct task_struct *p)
rcu_read_unlock();
return idx;
}
-#elif IS_MODULE(CONFIG_CGROUP_NET_PRIO)
-static inline u32 task_netprioidx(struct task_struct *p)
-{
- struct cgroup_subsys_state *css;
- u32 idx = 0;
-
- rcu_read_lock();
- css = task_css(p, net_prio_subsys_id);
- if (css)
- idx = css->cgroup->id;
- rcu_read_unlock();
- return idx;
-}
-#endif
#else /* !CONFIG_CGROUP_NET_PRIO */
static inline u32 task_netprioidx(struct task_struct *p)
{
diff --git a/net/Kconfig b/net/Kconfig
index e411046a62e3..a83bc4cc45a4 100644
--- a/net/Kconfig
+++ b/net/Kconfig
@@ -239,7 +239,7 @@ config XPS
default y
config CGROUP_NET_PRIO
- tristate "Network priority cgroup"
+ bool "Network priority cgroup"
depends on CGROUPS
---help---
Cgroup subsystem for use in assigning processes to network priorities on
diff --git a/net/core/netclassid_cgroup.c b/net/core/netclassid_cgroup.c
index 719efd541668..9fc7f90d034c 100644
--- a/net/core/netclassid_cgroup.c
+++ b/net/core/netclassid_cgroup.c
@@ -112,9 +112,3 @@ struct cgroup_subsys net_cls_subsys = {
.base_cftypes = ss_files,
.module = THIS_MODULE,
};
-
-static int __init init_netclassid_cgroup(void)
-{
- return cgroup_load_subsys(&net_cls_subsys);
-}
-__initcall(init_netclassid_cgroup);
diff --git a/net/core/netprio_cgroup.c b/net/core/netprio_cgroup.c
index 9043caedcd08..cc3a31e7dc08 100644
--- a/net/core/netprio_cgroup.c
+++ b/net/core/netprio_cgroup.c
@@ -283,37 +283,9 @@ static struct notifier_block netprio_device_notifier = {
static int __init init_cgroup_netprio(void)
{
- int ret;
-
- ret = cgroup_load_subsys(&net_prio_subsys);
- if (ret)
- goto out;
-
register_netdevice_notifier(&netprio_device_notifier);
-
-out:
- return ret;
-}
-
-static void __exit exit_cgroup_netprio(void)
-{
- struct netprio_map *old;
- struct net_device *dev;
-
- unregister_netdevice_notifier(&netprio_device_notifier);
-
- cgroup_unload_subsys(&net_prio_subsys);
-
- rtnl_lock();
- for_each_netdev(&init_net, dev) {
- old = rtnl_dereference(dev->priomap);
- RCU_INIT_POINTER(dev->priomap, NULL);
- if (old)
- kfree_rcu(old, rcu);
- }
- rtnl_unlock();
+ return 0;
}
-module_init(init_cgroup_netprio);
-module_exit(exit_cgroup_netprio);
+subsys_initcall(init_cgroup_netprio);
MODULE_LICENSE("GPL v2");