linux-kernel - Re: [PATCH 3/8] mm/migrate.c: reform the last call on do_move_pages_to

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Message-ID: <20200120094608.GN18451@dhcp22.suse.cz>
Date:   Mon, 20 Jan 2020 10:46:08 +0100
From:   Michal Hocko <mhocko@...nel.org>
To:     Wei Yang <richardw.yang@...ux.intel.com>
Cc:     akpm@...ux-foundation.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, yang.shi@...ux.alibaba.com
Subject: Re: [PATCH 3/8] mm/migrate.c: reform the last call on
 do_move_pages_to_node()

On Sun 19-01-20 11:06:31, Wei Yang wrote:
> No functional change, just reform it to make it as the same shape as
> other calls on do_move_pages_to_node().
> 
> This is a preparation for further cleanup.
> 
> Signed-off-by: Wei Yang <richardw.yang@...ux.intel.com>
> ---
>  mm/migrate.c | 8 ++++++--
>  1 file changed, 6 insertions(+), 2 deletions(-)
> 
> diff --git a/mm/migrate.c b/mm/migrate.c
> index c3ef70de5876..4a63fb8fbb6d 100644
> --- a/mm/migrate.c
> +++ b/mm/migrate.c
> @@ -1675,8 +1675,12 @@ static int do_pages_move(struct mm_struct *mm, nodemask_t task_nodes,
>  
>  	/* Make sure we do not overwrite the existing error */
>  	err1 = do_move_pages_to_node(mm, &pagelist, current_node);
> -	if (!err1)
> -		err1 = store_status(status, start, current_node, i - start);
> +	if (err1) {
> +		if (err >= 0)
> +			err = err1;
> +		goto out;
> +	}
> +	err1 = store_status(status, start, current_node, i - start);

Please don't. This just makes the code harder to follow. The current err
and err1 is already quite ugly so do not make it more so.

>  	if (err >= 0)
>  		err = err1;
>  out:
> -- 
> 2.17.1

-- 
Michal Hocko
SUSE Labs