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-rw-r--r--kernel/cgroup.c19
1 files changed, 8 insertions, 11 deletions
diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index 40ed329482dd..c63fce0c5b24 100644
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -2877,16 +2877,17 @@ static int cgroup_subtree_control_show(struct seq_file *seq, void *v)
* cgroup_update_dfl_csses - update css assoc of a subtree in default hierarchy
* @cgrp: root of the subtree to update csses for
*
- * @cgrp's subtree_ss_mask has changed and its subtree's (self excluded)
- * css associations need to be updated accordingly. This function looks up
- * all css_sets which are attached to the subtree, creates the matching
- * updated css_sets and migrates the tasks to the new ones.
+ * @cgrp's control masks have changed and its subtree's css associations
+ * need to be updated accordingly. This function looks up all css_sets
+ * which are attached to the subtree, creates the matching updated css_sets
+ * and migrates the tasks to the new ones.
*/
static int cgroup_update_dfl_csses(struct cgroup *cgrp)
{
LIST_HEAD(preloaded_csets);
struct cgroup_taskset tset = CGROUP_TASKSET_INIT(tset);
- struct cgroup_subsys_state *css;
+ struct cgroup_subsys_state *d_css;
+ struct cgroup *dsct;
struct css_set *src_cset;
int ret;
@@ -2896,14 +2897,10 @@ static int cgroup_update_dfl_csses(struct cgroup *cgrp)
/* look up all csses currently attached to @cgrp's subtree */
spin_lock_bh(&css_set_lock);
- css_for_each_descendant_pre(css, cgroup_css(cgrp, NULL)) {
+ cgroup_for_each_live_descendant_pre(dsct, d_css, cgrp) {
struct cgrp_cset_link *link;
- /* self is not affected by subtree_ss_mask change */
- if (css->cgroup == cgrp)
- continue;
-
- list_for_each_entry(link, &css->cgroup->cset_links, cset_link)
+ list_for_each_entry(link, &dsct->cset_links, cset_link)
cgroup_migrate_add_src(link->cset, cgrp,
&preloaded_csets);
}