linux-kernel - Re: [PATCH] mm/page_ext: remove unused variable in offline_page

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Message-ID: <20220801052848.GB18790@hu-pkondeti-hyd.qualcomm.com>
Date:   Mon, 1 Aug 2022 10:58:48 +0530
From:   Pavan Kondeti <quic_pkondeti@...cinc.com>
To:     Charan Teja Kalla <quic_charante@...cinc.com>
CC:     <akpm@...ux-foundation.org>, <david@...hat.com>, <mhocko@...e.com>,
        <quic_pkondeti@...cinc.com>, <linux-mm@...ck.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] mm/page_ext: remove unused variable in offline_page_ext

On Mon, Aug 01, 2022 at 10:36:37AM +0530, Charan Teja Kalla wrote:
> Remove unused variable 'nid' in offline_page_ext(). This is not used
> since the page_ext code inception.
> 

Just to be clear, should we say "drop nid argument from offline_page_exit"?
With this change the symmetry between "online_page_exit" and "offline_page_exit"
is lost. But that is not a valid point to keep an unused argument.

> Signed-off-by: Charan Teja Kalla <quic_charante@...cinc.com>
> ---
>  mm/page_ext.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/mm/page_ext.c b/mm/page_ext.c
> index 3dc715d..e22a928 100644
> --- a/mm/page_ext.c
> +++ b/mm/page_ext.c
> @@ -336,7 +336,7 @@ static int __meminit online_page_ext(unsigned long start_pfn,
>  }
>  
>  static int __meminit offline_page_ext(unsigned long start_pfn,
> -				unsigned long nr_pages, int nid)
> +				unsigned long nr_pages)
>  {
>  	unsigned long start, end, pfn;
>  
> @@ -362,11 +362,11 @@ static int __meminit page_ext_callback(struct notifier_block *self,
>  		break;
>  	case MEM_OFFLINE:
>  		offline_page_ext(mn->start_pfn,
> -				mn->nr_pages, mn->status_change_nid);
> +				mn->nr_pages);
>  		break;
>  	case MEM_CANCEL_ONLINE:
>  		offline_page_ext(mn->start_pfn,
> -				mn->nr_pages, mn->status_change_nid);
> +				mn->nr_pages);
>  		break;
>  	case MEM_GOING_OFFLINE:
>  		break;

Looks good to me.

Thanks,
Pavan