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Diffstat (limited to 'kernel/cgroup.c')
-rw-r--r--kernel/cgroup.c43
1 files changed, 14 insertions, 29 deletions
diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index fb2fb11fbb25..a32f9432666c 100644
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -554,7 +554,6 @@ static struct css_set *find_existing_css_set(
{
int i;
struct cgroupfs_root *root = cgrp->root;
- struct hlist_node *node;
struct css_set *cg;
unsigned long key;
@@ -577,7 +576,7 @@ static struct css_set *find_existing_css_set(
}
key = css_set_hash(template);
- hash_for_each_possible(css_set_table, cg, node, hlist, key) {
+ hash_for_each_possible(css_set_table, cg, hlist, key) {
if (!compare_css_sets(cg, oldcg, cgrp, template))
continue;
@@ -1611,7 +1610,6 @@ static struct dentry *cgroup_mount(struct file_system_type *fs_type,
struct cgroupfs_root *existing_root;
const struct cred *cred;
int i;
- struct hlist_node *node;
struct css_set *cg;
BUG_ON(sb->s_root != NULL);
@@ -1666,7 +1664,7 @@ static struct dentry *cgroup_mount(struct file_system_type *fs_type,
/* Link the top cgroup in this hierarchy into all
* the css_set objects */
write_lock(&css_set_lock);
- hash_for_each(css_set_table, i, node, cg, hlist)
+ hash_for_each(css_set_table, i, cg, hlist)
link_css_set(&tmp_cg_links, cg, root_cgrp);
write_unlock(&css_set_lock);
@@ -4493,7 +4491,7 @@ int __init_or_module cgroup_load_subsys(struct cgroup_subsys *ss)
{
struct cgroup_subsys_state *css;
int i, ret;
- struct hlist_node *node, *tmp;
+ struct hlist_node *tmp;
struct css_set *cg;
unsigned long key;
@@ -4561,7 +4559,7 @@ int __init_or_module cgroup_load_subsys(struct cgroup_subsys *ss)
* this is all done under the css_set_lock.
*/
write_lock(&css_set_lock);
- hash_for_each_safe(css_set_table, i, node, tmp, cg, hlist) {
+ hash_for_each_safe(css_set_table, i, tmp, cg, hlist) {
/* skip entries that we already rehashed */
if (cg->subsys[ss->subsys_id])
continue;
@@ -4571,7 +4569,7 @@ int __init_or_module cgroup_load_subsys(struct cgroup_subsys *ss)
cg->subsys[ss->subsys_id] = css;
/* recompute hash and restore entry */
key = css_set_hash(cg->subsys);
- hash_add(css_set_table, node, key);
+ hash_add(css_set_table, &cg->hlist, key);
}
write_unlock(&css_set_lock);
@@ -4618,10 +4616,8 @@ void cgroup_unload_subsys(struct cgroup_subsys *ss)
offline_css(ss, dummytop);
ss->active = 0;
- if (ss->use_id) {
- idr_remove_all(&ss->idr);
+ if (ss->use_id)
idr_destroy(&ss->idr);
- }
/* deassign the subsys_id */
subsys[ss->subsys_id] = NULL;
@@ -5322,7 +5318,7 @@ EXPORT_SYMBOL_GPL(free_css_id);
static struct css_id *get_new_cssid(struct cgroup_subsys *ss, int depth)
{
struct css_id *newid;
- int myid, error, size;
+ int ret, size;
BUG_ON(!ss->use_id);
@@ -5330,35 +5326,24 @@ static struct css_id *get_new_cssid(struct cgroup_subsys *ss, int depth)
newid = kzalloc(size, GFP_KERNEL);
if (!newid)
return ERR_PTR(-ENOMEM);
- /* get id */
- if (unlikely(!idr_pre_get(&ss->idr, GFP_KERNEL))) {
- error = -ENOMEM;
- goto err_out;
- }
+
+ idr_preload(GFP_KERNEL);
spin_lock(&ss->id_lock);
/* Don't use 0. allocates an ID of 1-65535 */
- error = idr_get_new_above(&ss->idr, newid, 1, &myid);
+ ret = idr_alloc(&ss->idr, newid, 1, CSS_ID_MAX + 1, GFP_NOWAIT);
spin_unlock(&ss->id_lock);
+ idr_preload_end();
/* Returns error when there are no free spaces for new ID.*/
- if (error) {
- error = -ENOSPC;
+ if (ret < 0)
goto err_out;
- }
- if (myid > CSS_ID_MAX)
- goto remove_idr;
- newid->id = myid;
+ newid->id = ret;
newid->depth = depth;
return newid;
-remove_idr:
- error = -ENOSPC;
- spin_lock(&ss->id_lock);
- idr_remove(&ss->idr, myid);
- spin_unlock(&ss->id_lock);
err_out:
kfree(newid);
- return ERR_PTR(error);
+ return ERR_PTR(ret);
}