css_to_devcgroup
struct dev_cgroup *dev_cgroup = css_to_devcgroup(css);
struct dev_cgroup *parent_dev_cgroup = css_to_devcgroup(css->parent);
struct dev_cgroup *dev_cgroup = css_to_devcgroup(css);
struct dev_cgroup *dev_cgroup = css_to_devcgroup(css);
struct dev_cgroup *devcgroup = css_to_devcgroup(seq_css(m));
struct dev_cgroup *parent = css_to_devcgroup(childcg->css.parent);
struct dev_cgroup *parent = css_to_devcgroup(childcg->css.parent);
struct dev_cgroup *devcg = css_to_devcgroup(pos);
return css_to_devcgroup(task_css(task, devices_cgrp_id));
struct dev_cgroup *parent = css_to_devcgroup(devcgroup->css.parent);
retval = devcgroup_update_access(css_to_devcgroup(of_css(of)),