Re: [RFC PATCH 2/4] x86: use dmi check to treat disabled cpus as hotplug cpus.

[Yinghai Lu]

On Mon, Jan 11, 2010 at 7:13 PM, Linus Torvalds
<torvalds@xxxxxxxxxxxxxxxxxxxx> wrote:
>
>
> On Mon, 11 Jan 2010, Yinghai Lu wrote:
>>
>> some systems that have disable cpus entries because same
>>   BIOS will support 2 sockets and 4 sockets and more at
>>   same time, BIOS just leave some disable entries, but
>>   those system do not support cpu hotplug. we don't need
>>   treat disabled_cpus as hotplug cpus.
>>
>> so we can make nr_cpu_ids smaller and save more space
>>   (pcpu data allocations), and could make some systems run
>>   with logical flat instead of physical flat apic mode
>
> .. but this one I detest.
>
> We can't play games that depend on us always filling in some DMI table
> correctly. Things need to "just work".

maybe could change to list that doesn't need to treat disabled cpus as
hotplug cpus?

YH
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