linux-kernel - Re: [PATCH 5/6] mm: memory: add vm_normal_pmd

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Message-ID: <87pm2dwna0.fsf@yhuang6-desk2.ccr.corp.intel.com>
Date:   Wed, 20 Sep 2023 11:12:39 +0800
From:   "Huang, Ying" <ying.huang@...el.com>
To:     Kefeng Wang <wangkefeng.wang@...wei.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>, <willy@...radead.org>,
        <linux-mm@...ck.org>, <linux-kernel@...r.kernel.org>,
        <david@...hat.com>, Zi Yan <ziy@...dia.com>,
        Mike Kravetz <mike.kravetz@...cle.com>, <hughd@...gle.com>
Subject: Re: [PATCH 5/6] mm: memory: add vm_normal_pmd_folio()

Kefeng Wang <wangkefeng.wang@...wei.com> writes:

> The new vm_normal_pmd_folio() wrapper is similar to vm_normal_folio(),
> which allow them to completely replace the struct page variables with
> struct folio variables.
>
> Signed-off-by: Kefeng Wang <wangkefeng.wang@...wei.com>
> ---
>  include/linux/mm.h |  2 ++
>  mm/memory.c        | 10 ++++++++++
>  2 files changed, 12 insertions(+)
>
> diff --git a/include/linux/mm.h b/include/linux/mm.h
> index 12335de50140..7d05ec047186 100644
> --- a/include/linux/mm.h
> +++ b/include/linux/mm.h
> @@ -2327,6 +2327,8 @@ struct folio *vm_normal_folio(struct vm_area_struct *vma, unsigned long addr,
>  			     pte_t pte);
>  struct page *vm_normal_page(struct vm_area_struct *vma, unsigned long addr,
>  			     pte_t pte);
> +struct folio *vm_normal_pmd_folio(struct vm_area_struct *vma, unsigned long addr,
> +				  pmd_t pmd);
>  struct page *vm_normal_page_pmd(struct vm_area_struct *vma, unsigned long addr,
>  				pmd_t pmd);

Why do not follow the counterpart of page (vm_normal_page_pmd()) to be
vm_normal_folio_pmd()?

--
Best Regards,
Huang, Ying

> diff --git a/mm/memory.c b/mm/memory.c
> index ce3efe7255d2..d4296ee72730 100644
> --- a/mm/memory.c
> +++ b/mm/memory.c
> @@ -689,6 +689,16 @@ struct page *vm_normal_page_pmd(struct vm_area_struct *vma, unsigned long addr,
>  out:
>  	return pfn_to_page(pfn);
>  }
> +
> +struct folio *vm_normal_pmd_folio(struct vm_area_struct *vma, unsigned long addr,
> +				  pmd_t pmd)
> +{
> +	struct page *page = vm_normal_page_pmd(vma, addr, pmd);
> +
> +	if (page)
> +		return page_folio(page);
> +	return NULL;
> +}
>  #endif
>  
>  static void restore_exclusive_pte(struct vm_area_struct *vma,