linux-kernel - Re: [PATCH] Documentation / cpu hotplug: remove outdated description for MADT entries

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Date:	Fri, 21 Jun 2013 10:16:14 +0800
From:	Hanjun Guo <hanjun.guo@...aro.org>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
CC:	Rob Landley <rob@...dley.net>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Srivatsa Vaddagiri <vatsa@...ibm.com>,
	linux-acpi@...r.kernel.org, linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org, patches@...aro.org,
	linaro-kernel@...ts.linaro.org
Subject: Re: [PATCH] Documentation / cpu hotplug: remove outdated description
 for MADT entries

On 2013-6-21 3:52, Rafael J. Wysocki wrote:
> On Thursday, June 20, 2013 04:54:42 PM Hanjun Guo wrote:
>> More than 256 entries in ACPI MADT is supported from ACPI 3.0 Specification,
>> So the outdated description for MADT entries should be removed.
> 
> Well, it kind of is still valid for systems pre-dating ACPI 3.0, isn't it?

Yes, it is.

> 
> So perhaps instead of simply removing that information it would be better to
> rephrase it?

Good idea, I will update my patch and send out soon.

Thanks
Hanjun

> 
> Thanks,
> Rafael
> 
> 
>> Signed-off-by: Hanjun Guo <hanjun.guo@...aro.org>
>> ---
>>  Documentation/cpu-hotplug.txt |    3 ---
>>  1 file changed, 3 deletions(-)
>>
>> diff --git a/Documentation/cpu-hotplug.txt b/Documentation/cpu-hotplug.txt
>> index 9f40135..2e36e40 100644
>> --- a/Documentation/cpu-hotplug.txt
>> +++ b/Documentation/cpu-hotplug.txt
>> @@ -370,9 +370,6 @@ A: There is no clear spec defined way from ACPI that can give us that
>>     CPUs in MADT as hotpluggable CPUS.  In the case there are no disabled CPUS
>>     we assume 1/2 the number of CPUs currently present can be hotplugged.
>>  
>> -   Caveat: Today's ACPI MADT can only provide 256 entries since the apicid field
>> -   in MADT is only 8 bits.
>> -
>>  User Space Notification
>>  
>>  Hotplug support for devices is common in Linux today. Its being used today to
>>

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