linux-kernel - Re: [PATCH v2 1/5] mm/huge_memory.c: remove dedicated macro HPAGE_CACHE_INDEX

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Message-ID: <c7dab2a5-cf77-a1dd-201a-f4a5f190c4d7@redhat.com>
Date:   Thu, 29 Apr 2021 16:48:39 +0200
From:   David Hildenbrand <david@...hat.com>
To:     Miaohe Lin <linmiaohe@...wei.com>, akpm@...ux-foundation.org
Cc:     ziy@...dia.com, william.kucharski@...cle.com, willy@...radead.org,
        yang.shi@...ux.alibaba.com, aneesh.kumar@...ux.ibm.com,
        rcampbell@...dia.com, songliubraving@...com,
        kirill.shutemov@...ux.intel.com, riel@...riel.com,
        hannes@...xchg.org, minchan@...nel.org,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH v2 1/5] mm/huge_memory.c: remove dedicated macro
 HPAGE_CACHE_INDEX_MASK

On 29.04.21 15:26, Miaohe Lin 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>
> Reviewed-by: Anshuman Khandual <anshuman.khandual@....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;

I'd have used

if (!IS_ALIGNED(PHYS_PFN(vma->vm_start) - vma->vm_pgoff,

Reviewed-by: David Hildenbrand <david@...hat.com>

-- 
Thanks,

David / dhildenb