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

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Message-ID: <20200120222710.GB32314@richard>
Date:   Tue, 21 Jan 2020 06:27:10 +0800
From:   Wei Yang <richardw.yang@...ux.intel.com>
To:     Michal Hocko <mhocko@...nel.org>
Cc:     Wei Yang <richardw.yang@...ux.intel.com>,
        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 Mon, Jan 20, 2020 at 10:46:08AM +0100, Michal Hocko wrote:
>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.
>

Yes, I struggled a little on doing this change. Sounds we can merge this one
with the following consolidation.

>>  	if (err >= 0)
>>  		err = err1;
>>  out:
>> -- 
>> 2.17.1
>
>-- 
>Michal Hocko
>SUSE Labs

-- 
Wei Yang
Help you, Help me