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authorKOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>2008-07-25 01:46:55 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2008-07-25 10:53:35 -0700
commit71cbb949d17d4d776abd547135feb7f3282405c8 (patch)
treedecd47a6cb05a36bb8a2f224b50bd12a8acc862e
parentf2992db2a4f7ae10f61d5bc68c7c1528cec639e2 (diff)
cgroup: list_for_each cleanup
-------------------------- 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>
-rw-r--r--kernel/cgroup.c44
1 files changed, 21 insertions, 23 deletions
diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index f50edadfdd8..6836a906363 100644
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -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;