linux-kernel - Re: [PATCH 03/16] mm/huge_memory: fix comment of __pud_trans_huge

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Date:   Fri, 24 Jun 2022 19:56:20 +0100
From:   Matthew Wilcox <willy@...radead.org>
To:     Miaohe Lin <linmiaohe@...wei.com>
Cc:     akpm@...ux-foundation.org, shy828301@...il.com, zokeefe@...gle.com,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 03/16] mm/huge_memory: fix comment of
 __pud_trans_huge_lock

On Thu, Jun 23, 2022 at 01:06:14AM +0800, Miaohe Lin wrote:
> __pud_trans_huge_lock returns page table lock pointer if a given pud maps
> a thp instead of 'true' since introduced. Fix corresponding comments.

I think the comments here are rather wasted.  I think this comment
should be moved to pud_trans_huge_lock() and turned into kernel-doc
format.

> Signed-off-by: Miaohe Lin <linmiaohe@...wei.com>
> ---
>  mm/huge_memory.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/mm/huge_memory.c b/mm/huge_memory.c
> index 83fb6c3442ff..a26580da8011 100644
> --- a/mm/huge_memory.c
> +++ b/mm/huge_memory.c
> @@ -1903,10 +1903,10 @@ spinlock_t *__pmd_trans_huge_lock(pmd_t *pmd, struct vm_area_struct *vma)
>  }
>  
>  /*
> - * Returns true if a given pud maps a thp, false otherwise.
> + * Returns page table lock pointer if a given pud maps a thp, NULL otherwise.
>   *
> - * Note that if it returns true, this routine returns without unlocking page
> - * table lock. So callers must unlock it.
> + * Note that if it returns page table lock pointe, this routine returns without
> + * unlocking page table lock. So callers must unlock it.
>   */
>  spinlock_t *__pud_trans_huge_lock(pud_t *pud, struct vm_area_struct *vma)
>  {
> -- 
> 2.23.0
>