linux-kernel - Re: [RESEND PATCH] base/memory: pass the base_section in add_memory

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Date:   Wed, 14 Jun 2017 14:19:59 +0800
From:   Wei Yang <richard.weiyang@...il.com>
To:     Michal Hocko <mhocko@...nel.org>
Cc:     Wei Yang <richard.weiyang@...il.com>, gregkh@...uxfoundation.org,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [RESEND PATCH] base/memory: pass the base_section in
 add_memory_block

On Wed, Jun 14, 2017 at 07:59:25AM +0200, Michal Hocko wrote:
>On Wed 14-06-17 13:45:50, Wei Yang wrote:
>> Based on Greg's comment, cc it to mm list.
>> The original thread could be found https://lkml.org/lkml/2017/6/7/202
>

Wow, you are still working~ I just moved your response in this thread~

So that other audience would be convenient to see the whole story.

>I have already given you feedback
>http://lkml.kernel.org/r/20170613114842.GI10819@dhcp22.suse.cz
>and you seemed to ignore it completely.
>
>> The second parameter of init_memory_block() is used to calculate the
>> start_section_nr of this block, which means any section in the same block
>> would get the same start_section_nr.
>> 
>> This patch passes the base_section to init_memory_block(), so that to
>> reduce a local variable and a check in every loop.
>> 
>> Signed-off-by: Wei Yang <richard.weiyang@...il.com>
>> ---
>>  drivers/base/memory.c | 7 +++----
>>  1 file changed, 3 insertions(+), 4 deletions(-)
>> 
>> diff --git a/drivers/base/memory.c b/drivers/base/memory.c
>> index cc4f1d0cbffe..1e903aba2aa1 100644
>> --- a/drivers/base/memory.c
>> +++ b/drivers/base/memory.c
>> @@ -664,21 +664,20 @@ static int init_memory_block(struct memory_block **memory,
>>  static int add_memory_block(int base_section_nr)
>>  {
>>  	struct memory_block *mem;
>> -	int i, ret, section_count = 0, section_nr;
>> +	int i, ret, section_count = 0;
>>  
>>  	for (i = base_section_nr;
>>  	     (i < base_section_nr + sections_per_block) && i < NR_MEM_SECTIONS;
>>  	     i++) {
>>  		if (!present_section_nr(i))
>>  			continue;
>> -		if (section_count == 0)
>> -			section_nr = i;
>>  		section_count++;
>>  	}
>>  
>>  	if (section_count == 0)
>>  		return 0;
>> -	ret = init_memory_block(&mem, __nr_to_section(section_nr), MEM_ONLINE);
>> +	ret = init_memory_block(&mem, __nr_to_section(base_section_nr),
>> +				MEM_ONLINE);
>>  	if (ret)
>>  		return ret;
>>  	mem->section_count = section_count;
>> -- 
>> 2.11.0
>
>-- 
>Michal Hocko
>SUSE Labs

-- 
Wei Yang
Help you, Help me

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