linux-kernel - Re: [PATCH 03/15] mm/swap: fold __swap_info

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Date:   Wed, 18 May 2022 10:56:48 +0200
From:   Oscar Salvador <osalvador@...e.de>
To:     Miaohe Lin <linmiaohe@...wei.com>
Cc:     akpm@...ux-foundation.org, willy@...radead.org, vbabka@...e.cz,
        dhowells@...hat.com, neilb@...e.de, apopple@...dia.com,
        david@...hat.com, surenb@...gle.com, peterx@...hat.com,
        naoya.horiguchi@....com, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 03/15] mm/swap: fold __swap_info_get() into its sole
 caller

On Mon, May 09, 2022 at 09:14:04PM +0800, Miaohe Lin wrote:
> Fold __swap_info_get() into its sole caller to make code more clear.
> Minor readability improvement.
> 
> Signed-off-by: Miaohe Lin <linmiaohe@...wei.com>

Reviewed-by: Oscar Salvador <osalvador@...e.de>

> ---
>  mm/swapfile.c | 24 ++++++------------------
>  1 file changed, 6 insertions(+), 18 deletions(-)
> 
> diff --git a/mm/swapfile.c b/mm/swapfile.c
> index 05ca79e68d63..0aee6286d6a7 100644
> --- a/mm/swapfile.c
> +++ b/mm/swapfile.c
> @@ -1123,7 +1123,7 @@ int get_swap_pages(int n_goal, swp_entry_t swp_entries[], int entry_size)
>  	return n_ret;
>  }
>  
> -static struct swap_info_struct *__swap_info_get(swp_entry_t entry)
> +static struct swap_info_struct *_swap_info_get(swp_entry_t entry)
>  {
>  	struct swap_info_struct *p;
>  	unsigned long offset;
> @@ -1138,8 +1138,13 @@ static struct swap_info_struct *__swap_info_get(swp_entry_t entry)
>  	offset = swp_offset(entry);
>  	if (offset >= p->max)
>  		goto bad_offset;
> +	if (data_race(!p->swap_map[swp_offset(entry)]))
> +		goto bad_free;
>  	return p;
>  
> +bad_free:
> +	pr_err("%s: %s%08lx\n", __func__, Unused_offset, entry.val);
> +	goto out;
>  bad_offset:
>  	pr_err("%s: %s%08lx\n", __func__, Bad_offset, entry.val);
>  	goto out;
> @@ -1152,23 +1157,6 @@ static struct swap_info_struct *__swap_info_get(swp_entry_t entry)
>  	return NULL;
>  }
>  
> -static struct swap_info_struct *_swap_info_get(swp_entry_t entry)
> -{
> -	struct swap_info_struct *p;
> -
> -	p = __swap_info_get(entry);
> -	if (!p)
> -		goto out;
> -	if (data_race(!p->swap_map[swp_offset(entry)]))
> -		goto bad_free;
> -	return p;
> -
> -bad_free:
> -	pr_err("%s: %s%08lx\n", __func__, Unused_offset, entry.val);
> -out:
> -	return NULL;
> -}
> -
>  static struct swap_info_struct *swap_info_get_cont(swp_entry_t entry,
>  					struct swap_info_struct *q)
>  {
> -- 
> 2.23.0
> 
> 

-- 
Oscar Salvador
SUSE Labs