linux-kernel - Re: [PATCH v2] Documentation, dt, numa: Add note to empty NUMA node

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Date:   Fri, 25 Jun 2021 14:27:02 +1000
From:   Gavin Shan <gshan@...hat.com>
To:     Randy Dunlap <rdunlap@...radead.org>, devicetree@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, robh+dt@...nel.org,
        drjones@...hat.com, shan.gavin@...il.com
Subject: Re: [PATCH v2] Documentation, dt, numa: Add note to empty NUMA node

On 6/25/21 11:49 AM, Randy Dunlap wrote:
> On 6/24/21 7:03 PM, Gavin Shan wrote:
>> The empty NUMA nodes, where no memory resides in, are allowed. For
>> these empty NUMA nodes, the 'len' of 'reg' property is zero. These
>> empty NUMA node IDs are still valid and parsed. I finds difficulty
>> to get where it's properly documented.
>>
>> So lets add note to empty NUMA nodes in the NUMA binding doc.
>>
>> Signed-off-by: Gavin Shan <gshan@...hat.com>
>> ---
>> v2: Update to address Randy's comments
> 
> Hi Gavin,
> 
> Sorry, there has been some misunderstanding. Please see below.
> 
> 
>> ---
>>   Documentation/devicetree/bindings/numa.txt | 4 ++++
>>   1 file changed, 4 insertions(+)
>>
>> diff --git a/Documentation/devicetree/bindings/numa.txt b/Documentation/devicetree/bindings/numa.txt
>> index 21b35053ca5a..08e361f9954c 100644
>> --- a/Documentation/devicetree/bindings/numa.txt
>> +++ b/Documentation/devicetree/bindings/numa.txt
>> @@ -109,6 +109,10 @@ Example:
>>   Dual socket system consists of 2 boards connected through ccn bus and
>>   each board having one socket/soc of 8 cpus, memory and pci bus.
>>   
>> +Note that the empty NUMA nodes, which no memory resides in period, are
> 
> In patch v1, this was:
> 
>    +Note that the empty NUMA nodes, which no memory resides in, are allowed
> 
> and I said:
> 
>    Missing period at end of the sentence above.
> 
> What I meant by that was "Missing 'period' ('.') punctuation at the end
> of the sentence above. So it should simply be changed to:
> 
> 
>    +Note that the empty NUMA nodes, which no memory resides in, are allowed.
> 

Thanks, Randy. v3 will be posted shortly to have everything corrected.
Sorry about the misunderstanding.

I thought "in period" means "temporarily" and it makes sense to me :)

> 
>> +allowed. Their NUMA node IDs are still valid so that memory can be added
>> +into these NUMA nodes through hotplug afterwards.
>> +
>>   	memory@...000 {
>>   		device_type = "memory";
>>   		reg = <0x0 0xc00000 0x0 0x80000000>;
> 
> Sorry about the confusion.
> 

Sorry to take more of your time to review :)

Thanks,
Gavin