linux-kernel - Re: [PATCH] mm/huge_memory: make is_transparent

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Date:   Wed, 2 Mar 2022 10:24:34 -0800
From:   Yang Shi <shy828301@...il.com>
To:     Miaohe Lin <linmiaohe@...wei.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Matthew Wilcox <willy@...radead.org>,
        William Kucharski <william.kucharski@...cle.com>,
        Hugh Dickins <hughd@...gle.com>, Peter Xu <peterx@...hat.com>,
        Linux MM <linux-mm@...ck.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] mm/huge_memory: make is_transparent_hugepage() static

On Wed, Mar 2, 2022 at 12:22 AM Miaohe Lin <linmiaohe@...wei.com> wrote:
>
> It's only used inside the huge_memory.c now. Don't export it and make
> it static. We can thus reduce the size of huge_memory.o a bit.
>
> Without this patch:
>    text    data     bss     dec     hex filename
>   32319    2965       4   35288    89d8 mm/huge_memory.o
>
> With this patch:
>    text    data     bss     dec     hex filename
>   32042    2957       4   35003    88bb mm/huge_memory.o
>
> Signed-off-by: Miaohe Lin <linmiaohe@...wei.com>

Reviewed-by: Yang Shi <shy828301@...il.com>

> ---
>  include/linux/huge_mm.h | 6 ------
>  mm/huge_memory.c        | 3 +--
>  2 files changed, 1 insertion(+), 8 deletions(-)
>
> diff --git a/include/linux/huge_mm.h b/include/linux/huge_mm.h
> index 0734aff8fa19..2999190adc22 100644
> --- a/include/linux/huge_mm.h
> +++ b/include/linux/huge_mm.h
> @@ -183,7 +183,6 @@ unsigned long thp_get_unmapped_area(struct file *filp, unsigned long addr,
>
>  void prep_transhuge_page(struct page *page);
>  void free_transhuge_page(struct page *page);
> -bool is_transparent_hugepage(struct page *page);
>
>  bool can_split_folio(struct folio *folio, int *pextra_pins);
>  int split_huge_page_to_list(struct page *page, struct list_head *list);
> @@ -341,11 +340,6 @@ static inline bool transhuge_vma_enabled(struct vm_area_struct *vma,
>
>  static inline void prep_transhuge_page(struct page *page) {}
>
> -static inline bool is_transparent_hugepage(struct page *page)
> -{
> -       return false;
> -}
> -
>  #define transparent_hugepage_flags 0UL
>
>  #define thp_get_unmapped_area  NULL
> diff --git a/mm/huge_memory.c b/mm/huge_memory.c
> index b49e1a11df2e..592588825c07 100644
> --- a/mm/huge_memory.c
> +++ b/mm/huge_memory.c
> @@ -533,7 +533,7 @@ void prep_transhuge_page(struct page *page)
>         set_compound_page_dtor(page, TRANSHUGE_PAGE_DTOR);
>  }
>
> -bool is_transparent_hugepage(struct page *page)
> +static inline bool is_transparent_hugepage(struct page *page)
>  {
>         if (!PageCompound(page))
>                 return false;
> @@ -542,7 +542,6 @@ bool is_transparent_hugepage(struct page *page)
>         return is_huge_zero_page(page) ||
>                page[1].compound_dtor == TRANSHUGE_PAGE_DTOR;
>  }
> -EXPORT_SYMBOL_GPL(is_transparent_hugepage);
>
>  static unsigned long __thp_get_unmapped_area(struct file *filp,
>                 unsigned long addr, unsigned long len,
> --
> 2.23.0
>