Re: [PATCH] Documentation / cpu hotplug: remove outdated description for MADT entries

Hanjun Guo
2013-06-21T02:17:18Z

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 So the outdated description for MADT entries should be removed.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@linaro.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
>>