linux-kernel - Re: [PATCH 4/9] v3 Allow memory blocks to span multiple memory sections

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Message-ID: <4CA62EF6.8000204@austin.ibm.com>
Date:	Fri, 01 Oct 2010 13:56:54 -0500
From:	Nathan Fontenot <nfont@...tin.ibm.com>
To:	Robin Holt <holt@....com>
CC:	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	linuxppc-dev@...ts.ozlabs.org, Greg KH <greg@...ah.com>,
	Dave Hansen <dave@...ux.vnet.ibm.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	steiner@....com
Subject: Re: [PATCH 4/9] v3 Allow memory blocks to span multiple memory sections

On 10/01/2010 01:52 PM, Robin Holt wrote:
> On Fri, Oct 01, 2010 at 01:31:51PM -0500, Nathan Fontenot wrote:
>> Update the memory sysfs code such that each sysfs memory directory is now
>> considered a memory block that can span multiple memory sections per
>> memory block.  The default size of each memory block is SECTION_SIZE_BITS
>> to maintain the current behavior of having a single memory section per
>> memory block (i.e. one sysfs directory per memory section).
>>
>> For architectures that want to have memory blocks span multiple
>> memory sections they need only define their own memory_block_size_bytes()
>> routine.
>>
>> Signed-off-by: Nathan Fontenot <nfont@...tin.ibm.com>
>>
>> ---
>>  drivers/base/memory.c |  155 ++++++++++++++++++++++++++++++++++----------------
>>  1 file changed, 108 insertions(+), 47 deletions(-)
>>
>> Index: linux-next/drivers/base/memory.c
>> ===================================================================
>> --- linux-next.orig/drivers/base/memory.c	2010-09-30 14:13:50.000000000 -0500
>> +++ linux-next/drivers/base/memory.c	2010-09-30 14:46:00.000000000 -0500
> ...
>> +static unsigned long get_memory_block_size(void)
>> +{
>> +	u32 block_sz;
>         ^^^
> 
> I think this should be unsigned long.  u32 will work, but everything
> else has been changed to use unsigned long.  If you disagree, I will
> happily acquiesce as nothing is currently broken.  If SGI decides to make
> memory_block_size_bytes more dynamic, we will fix this up at that time.

You're right, that should have been made an unsigned long also.  I'll attach a new
patch with that corrected.

-Nathan
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