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cgroup: list_for_each cleanup

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--------------------------
while() {
	list_entry();
	...
}
--------------------------

is equivalent to following code.

--------------------------
list_for_each_entry(){
	...
}
--------------------------

later can review easily more.

this patch is just clean up.
it doesn't have any behavor change.

Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Paul Menage <menage@google.com>
Cc: Li Zefan <lizf@cn.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
KOSAKI Motohiro 2008-07-25 01:46:55 -07:00 committed by Linus Torvalds
parent f2992db2a4
commit 71cbb949d1
1 changed files with 21 additions and 23 deletions
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44
kernel/cgroup.c
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@ -241,17 +241,20 @@ static int use_task_css_set_links;
*/
static void unlink_css_set(struct css_set *cg)
{
struct cg_cgroup_link *link;
struct cg_cgroup_link *saved_link;
write_lock(&css_set_lock);
hlist_del(&cg->hlist);
css_set_count--;
while (!list_empty(&cg->cg_links)) {
struct cg_cgroup_link *link;
link = list_entry(cg->cg_links.next,
struct cg_cgroup_link, cg_link_list);
list_for_each_entry_safe(link, saved_link, &cg->cg_links,
cg_link_list) {
list_del(&link->cg_link_list);
list_del(&link->cgrp_link_list);
kfree(link);
}
write_unlock(&css_set_lock);
}
@ -363,15 +366,14 @@ static struct css_set *find_existing_css_set(
static int allocate_cg_links(int count, struct list_head *tmp)
{
struct cg_cgroup_link *link;
struct cg_cgroup_link *saved_link;
int i;
INIT_LIST_HEAD(tmp);
for (i = 0; i < count; i++) {
link = kmalloc(sizeof(*link), GFP_KERNEL);
if (!link) {
while (!list_empty(tmp)) {
link = list_entry(tmp->next,
struct cg_cgroup_link,
cgrp_link_list);
list_for_each_entry_safe(link, saved_link, tmp,
cgrp_link_list) {
list_del(&link->cgrp_link_list);
kfree(link);
}
@ -384,11 +386,10 @@ static int allocate_cg_links(int count, struct list_head *tmp)
static void free_cg_links(struct list_head *tmp)
{
while (!list_empty(tmp)) {
struct cg_cgroup_link *link;
link = list_entry(tmp->next,
struct cg_cgroup_link,
cgrp_link_list);
struct cg_cgroup_link *link;
struct cg_cgroup_link *saved_link;
list_for_each_entry_safe(link, saved_link, tmp, cgrp_link_list) {
list_del(&link->cgrp_link_list);
kfree(link);
}
@ -1093,6 +1094,8 @@ static void cgroup_kill_sb(struct super_block *sb) {
struct cgroupfs_root *root = sb->s_fs_info;
struct cgroup *cgrp = &root->top_cgroup;
int ret;
struct cg_cgroup_link *link;
struct cg_cgroup_link *saved_link;
BUG_ON(!root);
@ -1112,10 +1115,9 @@ static void cgroup_kill_sb(struct super_block *sb) {
* root cgroup
*/
write_lock(&css_set_lock);
while (!list_empty(&cgrp->css_sets)) {
struct cg_cgroup_link *link;
link = list_entry(cgrp->css_sets.next,
struct cg_cgroup_link, cgrp_link_list);
list_for_each_entry_safe(link, saved_link, &cgrp->css_sets,
cgrp_link_list) {
list_del(&link->cg_link_list);
list_del(&link->cgrp_link_list);
kfree(link);
@ -1756,15 +1758,11 @@ int cgroup_add_files(struct cgroup *cgrp,
int cgroup_task_count(const struct cgroup *cgrp)
{
int count = 0;
struct list_head *l;
struct cg_cgroup_link *link;
read_lock(&css_set_lock);
l = cgrp->css_sets.next;
while (l != &cgrp->css_sets) {
struct cg_cgroup_link *link =
list_entry(l, struct cg_cgroup_link, cgrp_link_list);
list_for_each_entry(link, &cgrp->css_sets, cgrp_link_list) {
count += atomic_read(&link->cg->ref.refcount);
l = l->next;
}
read_unlock(&css_set_lock);
return count;