css_task_iter_start
void css_task_iter_start(struct cgroup_subsys_state *css, unsigned int flags,
css_task_iter_start(css, flags, kit->css_it);
css_task_iter_start(&from->self, 0, &it);
css_task_iter_start(&cgrp->self, 0, &it);
css_task_iter_start(&cgrp->self, 0, &it);
css_task_iter_start(&cgrp->self, CSS_TASK_ITER_PROCS | CSS_TASK_ITER_THREADED, &it);
css_task_iter_start(&cgrp->self, iter_flags, it);
css_task_iter_start(&cgrp->self, iter_flags, it);
css_task_iter_start(&cgrp->self, 0, &it);
css_task_iter_start(&cs->css, 0, &it);
css_task_iter_start(&cs->css, 0, &it);
css_task_iter_start(&cs->css, 0, &it);
css_task_iter_start(&cs->css, 0, &it);
css_task_iter_start(&cgrp->self, 0, &it);
css_task_iter_start(css, 0, &it);
css_task_iter_start(&freezer->css, 0, &it);
css_task_iter_start(&freezer->css, 0, &it);
css_task_iter_start(css, 0, &it);
css_task_iter_start(&tg->css, 0, &it);
css_task_iter_start(&iter->css, CSS_TASK_ITER_PROCS, &it);
css_task_iter_start(css, 0, &it);