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cgroup: remove css_get_next 

Now that we have generic and well ordered cgroup tree walkers there is
no need to keep css_get_next in the place.

Signed-off-by: Michal Hocko <mhocko@suse.cz>
Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Acked-by: Li Zefan <lizefan@huawei.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Ying Han <yinghan@google.com>
Cc: Tejun Heo <htejun@gmail.com>
Cc: Glauber Costa <glommer@parallels.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Michal Hocko 2013-04-29 15:07:21 -07:00 committed by Linus Torvalds
parent 16248d8fe6
commit 6d2488f64a
2 changed files with 0 additions and 56 deletions
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7
include/linux/cgroup.h
View File

@ -687,13 +687,6 @@ void free_css_id(struct cgroup_subsys *ss, struct cgroup_subsys_state *css);
struct cgroup_subsys_state *css_lookup(struct cgroup_subsys *ss, int id);
/*
* Get a cgroup whose id is greater than or equal to id under tree of root.
* Returning a cgroup_subsys_state or NULL.
*/
struct cgroup_subsys_state *css_get_next(struct cgroup_subsys *ss, int id,
struct cgroup_subsys_state *root, int *foundid);
/* Returns true if root is ancestor of cg */
bool css_is_ancestor(struct cgroup_subsys_state *cg,
const struct cgroup_subsys_state *root);

49
kernel/cgroup.c
View File

@ -5416,55 +5416,6 @@ struct cgroup_subsys_state *css_lookup(struct cgroup_subsys *ss, int id)
}
EXPORT_SYMBOL_GPL(css_lookup);
/**
* css_get_next - lookup next cgroup under specified hierarchy.
* @ss: pointer to subsystem
* @id: current position of iteration.
* @root: pointer to css. search tree under this.
* @foundid: position of found object.
*
* Search next css under the specified hierarchy of rootid. Calling under
* rcu_read_lock() is necessary. Returns NULL if it reaches the end.
*/
struct cgroup_subsys_state *
css_get_next(struct cgroup_subsys *ss, int id,
struct cgroup_subsys_state *root, int *foundid)
{
struct cgroup_subsys_state *ret = NULL;
struct css_id *tmp;
int tmpid;
int rootid = css_id(root);
int depth = css_depth(root);
if (!rootid)
return NULL;
BUG_ON(!ss->use_id);
WARN_ON_ONCE(!rcu_read_lock_held());
/* fill start point for scan */
tmpid = id;
while (1) {
/*
* scan next entry from bitmap(tree), tmpid is updated after
* idr_get_next().
*/
tmp = idr_get_next(&ss->idr, &tmpid);
if (!tmp)
break;
if (tmp->depth >= depth && tmp->stack[depth] == rootid) {
ret = rcu_dereference(tmp->css);
if (ret) {
*foundid = tmpid;
break;
}
}
/* continue to scan from next id */
tmpid = tmpid + 1;
}
return ret;
}
/*
* get corresponding css from file open on cgroupfs directory
*/