diff options
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/cgroup/cgroup.c | 29 |
1 files changed, 17 insertions, 12 deletions
diff --git a/kernel/cgroup/cgroup.c b/kernel/cgroup/cgroup.c index 6aaf5dd5383b..1f84977fab47 100644 --- a/kernel/cgroup/cgroup.c +++ b/kernel/cgroup/cgroup.c @@ -4202,20 +4202,25 @@ static void css_task_iter_advance(struct css_task_iter *it) lockdep_assert_held(&css_set_lock); repeat: - /* - * Advance iterator to find next entry. cset->tasks is consumed - * first and then ->mg_tasks. After ->mg_tasks, we move onto the - * next cset. - */ - next = it->task_pos->next; + if (it->task_pos) { + /* + * Advance iterator to find next entry. cset->tasks is + * consumed first and then ->mg_tasks. After ->mg_tasks, + * we move onto the next cset. + */ + next = it->task_pos->next; - if (next == it->tasks_head) - next = it->mg_tasks_head->next; + if (next == it->tasks_head) + next = it->mg_tasks_head->next; - if (next == it->mg_tasks_head) + if (next == it->mg_tasks_head) + css_task_iter_advance_css_set(it); + else + it->task_pos = next; + } else { + /* called from start, proceed to the first cset */ css_task_iter_advance_css_set(it); - else - it->task_pos = next; + } /* if PROCS, skip over tasks which aren't group leaders */ if ((it->flags & CSS_TASK_ITER_PROCS) && it->task_pos && @@ -4255,7 +4260,7 @@ void css_task_iter_start(struct cgroup_subsys_state *css, unsigned int flags, it->cset_head = it->cset_pos; - css_task_iter_advance_css_set(it); + css_task_iter_advance(it); spin_unlock_irq(&css_set_lock); } |