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cgroup: kill css_id

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The only user of css_id was memcg, and it has been convered to use
cgroup->id, so kill css_id.

Signed-off-by: Li Zefan <lizefan@huwei.com>
Reviewed-by: Michal Hocko <mhocko@suse.cz>
Acked-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Li Zefan
2013-09-23 16:57:03 +08:00
committed by Tejun Heo
parent b862783594
commit 2ff2a7d03b
2 changed files with 1 additions and 284 deletions
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37
include/linux/cgroup.h
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@@ -612,11 +612,6 @@ struct cgroup_subsys {
int subsys_id;
int disabled;
int early_init;
/*
* True if this subsys uses ID. ID is not available before cgroup_init()
* (not available in early_init time.)
*/
bool use_id;
/*
* If %false, this subsystem is properly hierarchical -
@@ -642,9 +637,6 @@ struct cgroup_subsys {
*/
struct cgroupfs_root *root;
struct list_head sibling;
/* used when use_id == true */
struct idr idr;
spinlock_t id_lock;
/* list of cftype_sets */
struct list_head cftsets;
@@ -875,35 +867,6 @@ int css_scan_tasks(struct cgroup_subsys_state *css,
int cgroup_attach_task_all(struct task_struct *from, struct task_struct *);
int cgroup_transfer_tasks(struct cgroup *to, struct cgroup *from);
/*
* CSS ID is ID for cgroup_subsys_state structs under subsys. This only works
* if cgroup_subsys.use_id == true. It can be used for looking up and scanning.
* CSS ID is assigned at cgroup allocation (create) automatically
* and removed when subsys calls free_css_id() function. This is because
* the lifetime of cgroup_subsys_state is subsys's matter.
*
* Looking up and scanning function should be called under rcu_read_lock().
* Taking cgroup_mutex is not necessary for following calls.
* But the css returned by this routine can be "not populated yet" or "being
* destroyed". The caller should check css and cgroup's status.
*/
/*
* Typically Called at ->destroy(), or somewhere the subsys frees
* cgroup_subsys_state.
*/
void free_css_id(struct cgroup_subsys *ss, struct cgroup_subsys_state *css);
/* Find a cgroup_subsys_state which has given ID */
struct cgroup_subsys_state *css_lookup(struct cgroup_subsys *ss, int id);
/* Returns true if root is ancestor of cg */
bool css_is_ancestor(struct cgroup_subsys_state *cg,
const struct cgroup_subsys_state *root);
/* Get id and depth of css */
unsigned short css_id(struct cgroup_subsys_state *css);
struct cgroup_subsys_state *css_from_dir(struct dentry *dentry,
struct cgroup_subsys *ss);