linux-kernel - Re: [PATCH 4/5] v2 Update sysfs node routines for new sysfs memory directories

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Message-ID: <4C407D5E.7060702@austin.ibm.com>
Date:	Fri, 16 Jul 2010 10:40:14 -0500
From:	Nathan Fontenot <nfont@...tin.ibm.com>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
CC:	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	linuxppc-dev@...abs.org
Subject: Re: [PATCH 4/5] v2 Update sysfs node routines for new sysfs memory
 directories

On 07/15/2010 07:12 PM, KAMEZAWA Hiroyuki wrote:
> On Thu, 15 Jul 2010 13:40:40 -0500
> Nathan Fontenot <nfont@...tin.ibm.com> wrote:
> 
>> Update the node sysfs directory routines that create
>> links to the memory sysfs directories under each node.
>> This update makes the node code aware that a memory sysfs
>> directory can cover multiple memory sections.
>>
>> Signed-off-by: Nathan Fontenot <nfont@...tin.ibm.com>
> 
> Shouldn't "static int link_mem_sections(int nid)" be update ?
> It does
>  for (pfn = start_pfn; pfn < end_pfn; pfn += PAGES_PER_SECTION) {
>         register..
> 

No, although the name 'link_mem_sections' does imply that it should.  The
range of start_pfn..end_pfn examined in this routine is the range of pfn's
covered by the entire node, not a memory_block.

-Nathan

> Thanks,
> -Kame
> 
> 
>> ---
>>  drivers/base/node.c |   12 ++++++++----
>>  1 file changed, 8 insertions(+), 4 deletions(-)
>>
>> Index: linux-2.6/drivers/base/node.c
>> ===================================================================
>> --- linux-2.6.orig/drivers/base/node.c	2010-07-15 09:54:06.000000000 -0500
>> +++ linux-2.6/drivers/base/node.c	2010-07-15 09:56:16.000000000 -0500
>> @@ -346,8 +346,10 @@
>>  		return -EFAULT;
>>  	if (!node_online(nid))
>>  		return 0;
>> -	sect_start_pfn = section_nr_to_pfn(mem_blk->phys_index);
>> -	sect_end_pfn = sect_start_pfn + PAGES_PER_SECTION - 1;
>> +
>> +	sect_start_pfn = section_nr_to_pfn(mem_blk->start_phys_index);
>> +	sect_end_pfn = section_nr_to_pfn(mem_blk->end_phys_index);
>> +	sect_end_pfn += PAGES_PER_SECTION - 1;
>>  	for (pfn = sect_start_pfn; pfn <= sect_end_pfn; pfn++) {
>>  		int page_nid;
>>  
>> @@ -383,8 +385,10 @@
>>  	if (!unlinked_nodes)
>>  		return -ENOMEM;
>>  	nodes_clear(*unlinked_nodes);
>> -	sect_start_pfn = section_nr_to_pfn(mem_blk->phys_index);
>> -	sect_end_pfn = sect_start_pfn + PAGES_PER_SECTION - 1;
>> +
>> +	sect_start_pfn = section_nr_to_pfn(mem_blk->start_phys_index);
>> +	sect_end_pfn = section_nr_to_pfn(mem_blk->end_phys_index);
>> +	sect_end_pfn += PAGES_PER_SECTION - 1;
>>  	for (pfn = sect_start_pfn; pfn <= sect_end_pfn; pfn++) {
>>  		int nid;
>>  
>>
>> --
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> 

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