Re: [PATCH] fix SMP kernel on SMP MoBo with APIC-less CPU

[Alan Cox]

> > -	if (smp_found_config)
> > +	if (smp_found_config && /* try only if the cpu has a local apic */
> > +	      (boot_cpu_data.x86_capability & X86_FEATURE_APIC))
> >  		get_smp_config();
> 
>  This is bogus -- there are valid SMP configurations with external 82489DX
> local APICs.  Tell the vendor to fix your BIOS not to provide a bogus MP
> table or boot with "nosmp" option instead.

The code I guess needs to spot that there isnt an APIC. The test proposed is
very wrong though. A CPU can have a local apic on a SMP board with no APIC
or IO-APIC set up (eg on daughtercard stuff)

There is only one sane test I can see. Figure if the CPU can have an APIC and
test it. If it cant have an APIC run a 489 test if there is an MP table
and actually poke the bits and see if its there