linux-kernel - Re: [PATCH 6/7] mm/hugetlb add folio

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Date:   Thu, 1 Sep 2022 11:34:48 -0700
From:   Mike Kravetz <mike.kravetz@...cle.com>
To:     Sidhartha Kumar <sidhartha.kumar@...cle.com>
Cc:     linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        akpm@...ux-foundation.org, songmuchun@...edance.com,
        willy@...radead.org, vbabka@...e.cz, william.kucharski@...cle.com,
        dhowells@...hat.com, peterx@...hat.com, arnd@...db.de,
        ccross@...gle.com, hughd@...gle.com, ebiederm@...ssion.com
Subject: Re: [PATCH 6/7] mm/hugetlb add folio_hstate()

On 08/29/22 16:00, Sidhartha Kumar wrote:
> Helper function to retrieve hstate information from a hugetlb folio.
> 
> 
> Signed-off-by: Sidhartha Kumar <sidhartha.kumar@...cle.com>
> ---
>  include/linux/hugetlb.h | 9 +++++++--
>  1 file changed, 7 insertions(+), 2 deletions(-)
> 
> diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h
> index d8742c5bf454..093b5d32d6b5 100644
> --- a/include/linux/hugetlb.h
> +++ b/include/linux/hugetlb.h
> @@ -815,10 +815,15 @@ static inline pte_t arch_make_huge_pte(pte_t entry, unsigned int shift,
>  }
>  #endif
>  
> +static inline struct hstate *folio_hstate(struct folio *folio)
> +{
> +	VM_BUG_ON_FOLIO(!folio_test_hugetlb(folio), folio);
> +	return size_to_hstate(folio_size(folio));
> +}
> +
>  static inline struct hstate *page_hstate(struct page *page)
>  {
> -	VM_BUG_ON_PAGE(!PageHuge(page), page);
> -	return size_to_hstate(page_size(page));
> +	return folio_hstate(page_folio(page));
>  }
>  
>  static inline unsigned hstate_index_to_shift(unsigned index)
> -- 
> 2.31.1
> 

I would suggest including patch 7 which makes use of folio_hstate.

-- 
Mike Kravetz