linux-kernel - Re: [PATCH 1/5] mm/huge_memory.c: remove dedicated macro HPAGE_CACHE_INDEX

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Date:   Tue, 27 Apr 2021 13:57:27 -0700
From:   Yang Shi <shy828301@...il.com>
To:     Miaohe Lin <linmiaohe@...wei.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>, Zi Yan <ziy@...dia.com>,
        william.kucharski@...cle.com, Matthew Wilcox <willy@...radead.org>,
        Yang Shi <yang.shi@...ux.alibaba.com>,
        aneesh.kumar@...ux.ibm.com, Ralph Campbell <rcampbell@...dia.com>,
        Song Liu <songliubraving@...com>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Rik van Riel <riel@...riel.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Minchan Kim <minchan@...nel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux MM <linux-mm@...ck.org>
Subject: Re: [PATCH 1/5] mm/huge_memory.c: remove dedicated macro HPAGE_CACHE_INDEX_MASK

On Tue, Apr 27, 2021 at 6:32 AM Miaohe Lin <linmiaohe@...wei.com> wrote:
>
> Rewrite the pgoff checking logic to remove macro HPAGE_CACHE_INDEX_MASK
> which is only used here to simplify the code.

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

>
> Signed-off-by: Miaohe Lin <linmiaohe@...wei.com>
> ---
>  include/linux/huge_mm.h | 6 ++----
>  1 file changed, 2 insertions(+), 4 deletions(-)
>
> diff --git a/include/linux/huge_mm.h b/include/linux/huge_mm.h
> index 9626fda5efce..0a526f211fec 100644
> --- a/include/linux/huge_mm.h
> +++ b/include/linux/huge_mm.h
> @@ -152,15 +152,13 @@ static inline bool __transparent_hugepage_enabled(struct vm_area_struct *vma)
>
>  bool transparent_hugepage_enabled(struct vm_area_struct *vma);
>
> -#define HPAGE_CACHE_INDEX_MASK (HPAGE_PMD_NR - 1)
> -
>  static inline bool transhuge_vma_suitable(struct vm_area_struct *vma,
>                 unsigned long haddr)
>  {
>         /* Don't have to check pgoff for anonymous vma */
>         if (!vma_is_anonymous(vma)) {
> -               if (((vma->vm_start >> PAGE_SHIFT) & HPAGE_CACHE_INDEX_MASK) !=
> -                       (vma->vm_pgoff & HPAGE_CACHE_INDEX_MASK))
> +               if (!IS_ALIGNED((vma->vm_start >> PAGE_SHIFT) - vma->vm_pgoff,
> +                               HPAGE_PMD_NR))
>                         return false;
>         }
>
> --
> 2.23.0
>
>