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    SubjectRe: [PATCH -V9 11/15] hugetlb/cgroup: Add charge/uncharge routines for hugetlb cgroup
    > +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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