hugetlb_cgroup_from_css
struct hugetlb_cgroup *parent_h_cgroup = hugetlb_cgroup_from_css(parent_css);
hugetlb_cgroup_free(hugetlb_cgroup_from_css(css));
struct hugetlb_cgroup *h_cg = hugetlb_cgroup_from_css(css);
struct hugetlb_cgroup *h_cg = hugetlb_cgroup_from_css(seq_css(seq));
usage += READ_ONCE(hugetlb_cgroup_from_css(css)
struct hugetlb_cgroup *h_cg = hugetlb_cgroup_from_css(css);
struct hugetlb_cgroup *h_cg = hugetlb_cgroup_from_css(seq_css(seq));
struct hugetlb_cgroup *h_cg = hugetlb_cgroup_from_css(of_css(of));
struct hugetlb_cgroup *h_cg = hugetlb_cgroup_from_css(of_css(of));
return hugetlb_cgroup_from_css(task_css(task, hugetlb_cgrp_id));
struct hugetlb_cgroup *h_cg = hugetlb_cgroup_from_css(seq_css(seq));
return hugetlb_cgroup_from_css(h_cg->css.parent);