linux-kernel - Re: [PATCH RFC 12/39] mm/rmap: remove page_add_file

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Date:   Fri, 8 Dec 2023 09:42:53 +0800
From:   "Yin, Fengwei" <fengwei.yin@...el.com>
To:     David Hildenbrand <david@...hat.com>,
        <linux-kernel@...r.kernel.org>
CC:     <linux-mm@...ck.org>, Andrew Morton <akpm@...ux-foundation.org>,
        "Matthew Wilcox (Oracle)" <willy@...radead.org>,
        Hugh Dickins <hughd@...gle.com>,
        Ryan Roberts <ryan.roberts@....com>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        Muchun Song <muchun.song@...ux.dev>,
        Peter Xu <peterx@...hat.com>
Subject: Re: [PATCH RFC 12/39] mm/rmap: remove page_add_file_rmap()



On 12/4/2023 10:21 PM, David Hildenbrand wrote:
> All users are gone, let's remove it.
> 
> Signed-off-by: David Hildenbrand <david@...hat.com>
Reviewed-by: Yin Fengwei <fengwei.yin@...el.com>

> ---
>   include/linux/rmap.h |  2 --
>   mm/rmap.c            | 21 ---------------------
>   2 files changed, 23 deletions(-)
> 
> diff --git a/include/linux/rmap.h b/include/linux/rmap.h
> index a4a30c361ac50..95f7b94a70295 100644
> --- a/include/linux/rmap.h
> +++ b/include/linux/rmap.h
> @@ -235,8 +235,6 @@ void page_add_new_anon_rmap(struct page *, struct vm_area_struct *,
>   		unsigned long address);
>   void folio_add_new_anon_rmap(struct folio *, struct vm_area_struct *,
>   		unsigned long address);
> -void page_add_file_rmap(struct page *, struct vm_area_struct *,
> -		bool compound);
>   void folio_add_file_rmap_ptes(struct folio *, struct page *, unsigned int nr,
>   		struct vm_area_struct *);
>   #define folio_add_file_rmap_pte(folio, page, vma) \
> diff --git a/mm/rmap.c b/mm/rmap.c
> index 1614d98062948..53e2c653be99a 100644
> --- a/mm/rmap.c
> +++ b/mm/rmap.c
> @@ -1422,27 +1422,6 @@ void folio_add_file_rmap_pmd(struct folio *folio, struct page *page,
>   #endif
>   }
>   
> -/**
> - * page_add_file_rmap - add pte mapping to a file page
> - * @page:	the page to add the mapping to
> - * @vma:	the vm area in which the mapping is added
> - * @compound:	charge the page as compound or small page
> - *
> - * The caller needs to hold the pte lock.
> - */
> -void page_add_file_rmap(struct page *page, struct vm_area_struct *vma,
> -		bool compound)
> -{
> -	struct folio *folio = page_folio(page);
> -
> -	VM_WARN_ON_ONCE_PAGE(compound && !PageTransHuge(page), page);
> -
> -	if (likely(!compound))
> -		folio_add_file_rmap_pte(folio, page, vma);
> -	else
> -		folio_add_file_rmap_pmd(folio, page, vma);
> -}
> -
>   /**
>    * page_remove_rmap - take down pte mapping from a page
>    * @page:	page to remove mapping from