Re: [patch x86/core] x86: allow number of additional hotplug CPUsto be set at compile time, V2

[Ingo Molnar]

* H. Peter Anvin <hpa@xxxxxxxxx> wrote:

> Ingo Molnar wrote:
>>>
>>> The default number of additional CPU IDs for hotplugging is 
>>> determined by asking ACPI or mptables how many "disabled" CPUs there 
>>> are in the system, but many systems get this wrong so that e.g. a 
>>> uniprocessor machine gets an extra CPU allocated and never switches 
>>> to single CPU mode.
>>>
>>> And sometimes CPU hotplugging is enabled only for suspend/hibernate  
>>> anyway, so the additional CPU IDs are not wanted. Allow the number to 
>>> be set to zero at compile time.
>>>
>
> Wouldn't this be better to have a runtime option?

yeah - and we already have the additional_cpus=x boot option, but a boot 
option is not generally useful to a distribution.

	Ingo
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