linux-kernel - Re: [PATCH 6/7] mm/khugepaged: remove unneeded return value of khugepaged_add_pte_mapped

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Date:   Tue, 14 Jun 2022 17:19:51 -0700
From:   Zach O'Keefe <zokeefe@...gle.com>
To:     Miaohe Lin <linmiaohe@...wei.com>
Cc:     akpm@...ux-foundation.org, aarcange@...hat.com,
        willy@...radead.org, vbabka@...e.cz, dhowells@...hat.com,
        neilb@...e.de, apopple@...dia.com, david@...hat.com,
        surenb@...gle.com, peterx@...hat.com, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 6/7] mm/khugepaged: remove unneeded return value of
 khugepaged_add_pte_mapped_thp()

On 11 Jun 16:47, Miaohe Lin wrote:
> The return value of khugepaged_add_pte_mapped_thp() is always 0 and also
> ignored. Remove it to clean up the code.
> 
> Signed-off-by: Miaohe Lin <linmiaohe@...wei.com>
> ---
>  mm/khugepaged.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/mm/khugepaged.c b/mm/khugepaged.c
> index 142e26e4bdbf..ee0a719c8be9 100644
> --- a/mm/khugepaged.c
> +++ b/mm/khugepaged.c
> @@ -1372,7 +1372,7 @@ static void collect_mm_slot(struct mm_slot *mm_slot)
>   * Notify khugepaged that given addr of the mm is pte-mapped THP. Then
>   * khugepaged should try to collapse the page table.
>   */
> -static int khugepaged_add_pte_mapped_thp(struct mm_struct *mm,
> +static void khugepaged_add_pte_mapped_thp(struct mm_struct *mm,
>  					 unsigned long addr)

Since this is a cleanup, should keep the second param aligned with opening
bracket to satisfy checkpatch.

Otherwise can add Reviewed-by: Zach O'Keefe <zokeefe@...gle.com>

>  {
>  	struct mm_slot *mm_slot;
> @@ -1384,7 +1384,6 @@ static int khugepaged_add_pte_mapped_thp(struct mm_struct *mm,
>  	if (likely(mm_slot && mm_slot->nr_pte_mapped_thp < MAX_PTE_MAPPED_THP))
>  		mm_slot->pte_mapped_thp[mm_slot->nr_pte_mapped_thp++] = addr;
>  	spin_unlock(&khugepaged_mm_lock);
> -	return 0;
>  }
>  
>  static void collapse_and_free_pmd(struct mm_struct *mm, struct vm_area_struct *vma,
> -- 
> 2.23.0
> 
>