linux-kernel - Re: [PATCH] mm/hugetlb: Use helper huge_page_order and pages_per_huge

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Date:   Thu, 14 Jan 2021 13:32:44 +0100
From:   David Hildenbrand <david@...hat.com>
To:     Miaohe Lin <linmiaohe@...wei.com>, akpm@...ux-foundation.org,
        mike.kravetz@...cle.com
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mm/hugetlb: Use helper huge_page_order and
 pages_per_huge_page

On 14.01.21 12:44, Miaohe Lin wrote:
> Since commit a5516438959d ("hugetlb: modular state for hugetlb page size"),
> we can use huge_page_order to access hstate->order and pages_per_huge_page
> to fetch the pages per huge page. But gather_bootmem_prealloc() forgot to
> use it.
> 
> Signed-off-by: Miaohe Lin <linmiaohe@...wei.com>
> ---
>  mm/hugetlb.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/mm/hugetlb.c b/mm/hugetlb.c
> index fe2da9ad6233..c04d922757c7 100644
> --- a/mm/hugetlb.c
> +++ b/mm/hugetlb.c
> @@ -2476,7 +2476,7 @@ static void __init gather_bootmem_prealloc(void)
>  		struct hstate *h = m->hstate;
>  
>  		WARN_ON(page_count(page) != 1);
> -		prep_compound_huge_page(page, h->order);
> +		prep_compound_huge_page(page, huge_page_order(h));
>  		WARN_ON(PageReserved(page));
>  		prep_new_huge_page(h, page, page_to_nid(page));
>  		put_page(page); /* free it into the hugepage allocator */
> @@ -2488,7 +2488,7 @@ static void __init gather_bootmem_prealloc(void)
>  		 * side-effects, like CommitLimit going negative.
>  		 */
>  		if (hstate_is_gigantic(h))
> -			adjust_managed_page_count(page, 1 << h->order);
> +			adjust_managed_page_count(page, pages_per_huge_page(h));
>  		cond_resched();
>  	}
>  }
> 

Reviewed-by: David Hildenbrand <david@...hat.com>

-- 
Thanks,

David / dhildenb