linux-kernel - Re: [PATCH] mm/huge_memory: remove unneeded local variable follflags

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Date:   Fri, 11 Mar 2022 10:21:34 +0530
From:   Anshuman Khandual <anshuman.khandual@....com>
To:     Miaohe Lin <linmiaohe@...wei.com>, akpm@...ux-foundation.org
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mm/huge_memory: remove unneeded local variable follflags

Hi Miaohe,

On 3/10/22 18:42, Miaohe Lin wrote:
> We can pass FOLL_GET | FOLL_DUMP to follow_page directly to simplify
> the code a bit.
> 
> Signed-off-by: Miaohe Lin <linmiaohe@...wei.com>
> ---
>  mm/huge_memory.c | 4 +---
>  1 file changed, 1 insertion(+), 3 deletions(-)
> 
> diff --git a/mm/huge_memory.c b/mm/huge_memory.c
> index 3557aabe86fe..418d077da246 100644
> --- a/mm/huge_memory.c
> +++ b/mm/huge_memory.c
> @@ -2838,7 +2838,6 @@ static int split_huge_pages_pid(int pid, unsigned long vaddr_start,
>  	 */
>  	for (addr = vaddr_start; addr < vaddr_end; addr += PAGE_SIZE) {
>  		struct vm_area_struct *vma = find_vma(mm, addr);
> -		unsigned int follflags;
>  		struct page *page;
>  
>  		if (!vma || addr < vma->vm_start)
> @@ -2851,8 +2850,7 @@ static int split_huge_pages_pid(int pid, unsigned long vaddr_start,
>  		}
>  
>  		/* FOLL_DUMP to ignore special (like zero) pages */
> -		follflags = FOLL_GET | FOLL_DUMP;
> -		page = follow_page(vma, addr, follflags);
> +		page = follow_page(vma, addr, FOLL_GET | FOLL_DUMP);
>  
>  		if (IS_ERR(page))
>  			continue;

LGTM, but there is another similar instance in add_page_for_migration()
inside mm/migrate.c, requiring this exact clean up.

Hence with that change in place.

Reviewed-by: Anshuman Khandual <anshuman.khandual@....com>