Re: More than 8 CPUs detected and CONFIG_X86_PC cannot handle it on2.6.16-rc6

[Andrew Morton]

Krzysztof Oledzki <olel@xxxxxx> wrote:
>
> On Sat, 11 Mar 2006, Andrew Morton wrote:
> 
>  > Krzysztof Oledzki <olel@xxxxxx> wrote:
>  >>
>  >> After upgrading to 2.6.16-rc6 I noticed this strange message:
>  >>
>  >>  More than 8 CPUs detected and CONFIG_X86_PC cannot handle it.
>  >>  Use CONFIG_X86_GENERICARCH or CONFIG_X86_BIGSMP.
>  >>
>  >> This is a Dell PowerEdge SC1425 with two P4 Xeons with HT enabled (so with
>  >>  totoal of 4 logical CPUs).
>  >
>  > Please send full dmesg output for the failing kernel, thanks.
>  Attached.
> 
>  > Which is the most-recently-tested kernel which behaved correctly?
>  2.6.15.6

OK, thanks.  I assume the machine's working OK?

>From my reading, you have CONFIG_HOTPLUG_CPU enabled and the machine has an
APIC.  I'd expect that lots of people would hit that warning but for some
reason they don't - possibly because most APICs don't have sufficiently
high version numbers?

Anyway, various people cc'ed.  I _think_ it's harmless, although the way in
which def_to_bigsmp propagates into the DMI and APIC code might be a
problem, depending upon config options.

Certainly the warning is incorrect, but I'm not sure what is the best thing
to do about it?

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