linux-kernel - Re: [PATCH 6/6] hugetlb_cgroup: use helper for_each_hstate and hstate

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Date:   Thu, 28 Jul 2022 11:04:05 -0700
From:   Mina Almasry <almasrymina@...gle.com>
To:     Miaohe Lin <linmiaohe@...wei.com>
Cc:     akpm@...ux-foundation.org, mike.kravetz@...cle.com,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 6/6] hugetlb_cgroup: use helper for_each_hstate and hstate_index

On Thu, Jul 28, 2022 at 5:20 AM Miaohe Lin <linmiaohe@...wei.com> wrote:
>
> Use helper for_each_hstate and hstate_index to iterate the hstate and get
> the hstate index. Minor readability improvement.
>
> Signed-off-by: Miaohe Lin <linmiaohe@...wei.com>

Reviewed-by: Mina Almasry <almasrymina@...gle.com>

> ---
>  mm/hugetlb_cgroup.c | 11 ++++-------
>  1 file changed, 4 insertions(+), 7 deletions(-)
>
> diff --git a/mm/hugetlb_cgroup.c b/mm/hugetlb_cgroup.c
> index 13ec091385af..8f20082df4c8 100644
> --- a/mm/hugetlb_cgroup.c
> +++ b/mm/hugetlb_cgroup.c
> @@ -74,11 +74,11 @@ parent_hugetlb_cgroup(struct hugetlb_cgroup *h_cg)
>
>  static inline bool hugetlb_cgroup_have_usage(struct hugetlb_cgroup *h_cg)
>  {
> -       int idx;
> +       struct hstate *h;
>
> -       for (idx = 0; idx < hugetlb_max_hstate; idx++) {
> +       for_each_hstate(h) {
>                 if (page_counter_read(
> -                               hugetlb_cgroup_counter_from_cgroup(h_cg, idx)))
> +                   hugetlb_cgroup_counter_from_cgroup(h_cg, hstate_index(h))))
>                         return true;
>         }
>         return false;
> @@ -224,17 +224,14 @@ static void hugetlb_cgroup_css_offline(struct cgroup_subsys_state *css)
>         struct hugetlb_cgroup *h_cg = hugetlb_cgroup_from_css(css);
>         struct hstate *h;
>         struct page *page;
> -       int idx;
>
>         do {
> -               idx = 0;
>                 for_each_hstate(h) {
>                         spin_lock_irq(&hugetlb_lock);
>                         list_for_each_entry(page, &h->hugepage_activelist, lru)
> -                               hugetlb_cgroup_move_parent(idx, h_cg, page);
> +                               hugetlb_cgroup_move_parent(hstate_index(h), h_cg, page);
>
>                         spin_unlock_irq(&hugetlb_lock);
> -                       idx++;
>                 }
>                 cond_resched();
>         } while (hugetlb_cgroup_have_usage(h_cg));
> --
> 2.23.0
>