> +int hugetlb_cgroup_charge_cgroup(int idx, unsigned long nr_pages,
> + struct hugetlb_cgroup **ptr)
> +{
> + int ret = 0;
> + struct res_counter *fail_res;
> + struct hugetlb_cgroup *h_cg = NULL;
> + unsigned long csize = nr_pages * PAGE_SIZE;
> +
> + if (hugetlb_cgroup_disabled())
> + goto done;
> + /*
> + * We don't charge any cgroup if the compound page have less
> + * than 3 pages.
> + */
> + if (huge_page_order(&hstates[idx]) < HUGETLB_CGROUP_MIN_ORDER)
> + goto done;
> +again:
> + rcu_read_lock();
> + h_cg = hugetlb_cgroup_from_task(current);
> + if (!h_cg)
In no circumstances should h_cg be NULL.
> + h_cg = root_h_cgroup;
> +
> + if (!css_tryget(&h_cg->css)) {
> + rcu_read_unlock();
> + goto again;
> + }
> + rcu_read_unlock();
> +
> + ret = res_counter_charge(&h_cg->hugepage[idx], csize, &fail_res);
> + css_put(&h_cg->css);
> +done:
> + *ptr = h_cg;
> + return ret;
> +}
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