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cgroup: switch to css_is_online() helper

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Use the new css_is_online() helper that has been introduced to check css
online state, instead of testing the CSS_ONLINE flag directly. This
improves readability and centralizes the state check logic.

No functional changes intended.

Signed-off-by: Chen Ridong <chenridong@huawei.com>
Acked-by: Shakeel Butt <shakeel.butt@linux.dev>
Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Chen Ridong 2025-12-02 02:57:47 +00:00 committed by Tejun Heo
parent 50133c09d1
commit 82d7e59ea7
5 changed files with 6 additions and 6 deletions
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2
fs/fs-writeback.c
View File

@ -981,7 +981,7 @@ void wbc_account_cgroup_owner(struct writeback_control *wbc, struct folio *folio
css = mem_cgroup_css_from_folio(folio);
/* dead cgroups shouldn't contribute to inode ownership arbitration */
if (!(css->flags & CSS_ONLINE))
if (!css_is_online(css))
return;
id = css->id;

2
include/linux/memcontrol.h
View File

@ -893,7 +893,7 @@ static inline bool mem_cgroup_online(struct mem_cgroup *memcg)
{
if (mem_cgroup_disabled())
return true;
return !!(memcg->css.flags & CSS_ONLINE);
return css_is_online(&memcg->css);
}
void mem_cgroup_update_lru_size(struct lruvec *lruvec, enum lru_list lru,

4
kernel/cgroup/cgroup.c
View File

@ -4948,7 +4948,7 @@ bool css_has_online_children(struct cgroup_subsys_state *css)
rcu_read_lock();
css_for_each_child(child, css) {
if (child->flags & CSS_ONLINE) {
if (css_is_online(child)) {
ret = true;
break;
}
@ -5753,7 +5753,7 @@ static void offline_css(struct cgroup_subsys_state *css)
lockdep_assert_held(&cgroup_mutex);
if (!(css->flags & CSS_ONLINE))
if (!css_is_online(css))
return;
if (ss->css_offline)

2
mm/memcontrol.c
View File

@ -281,7 +281,7 @@ ino_t page_cgroup_ino(struct page *page)
/* page_folio() is racy here, but the entire function is racy anyway */
memcg = folio_memcg_check(page_folio(page));
while (memcg && !(memcg->css.flags & CSS_ONLINE))
while (memcg && !css_is_online(&memcg->css))
memcg = parent_mem_cgroup(memcg);
if (memcg)
ino = cgroup_ino(memcg->css.cgroup);

2
mm/page_owner.c
View File

@ -530,7 +530,7 @@ static inline int print_page_owner_memcg(char *kbuf, size_t count, int ret,
if (!memcg)
goto out_unlock;
online = (memcg->css.flags & CSS_ONLINE);
online = css_is_online(&memcg->css);
cgroup_name(memcg->css.cgroup, name, sizeof(name));
ret += scnprintf(kbuf + ret, count - ret,
"Charged %sto %smemcg %s\n",