Re: [patch V3 26/60] x86/apic/32: Decrapify the def_bigsmp mechanism

[Thomas Gleixner]

On Mon, Aug 07 2023 at 13:11, Dave Hansen wrote:

> On 8/1/23 03:47, Thomas Gleixner wrote:
> ...
>> -void __init default_setup_apic_routing(void)
>> +void __init x86_32_probe_bigsmp_early(void)
>>  {
>> -	int version = boot_cpu_apic_version;
>> +	if (nr_cpu_ids <= 8 || xen_pv_domain())
>> +		return;
> ...
>> +void __init default_setup_apic_routing(void)
>> +{
>> +	if (nr_cpu_ids >= 8 && !xen_pv_domain())
>> +		apic_bigsmp_force();
>
> I thought bigsmp didn't come into play until 9 or more CPUs.  Won't this
> do apic_bigsmp_force() at nr_cpu_ids==8?
>
> Should this be:
>
> 	if (nr_cpu_ids > 8 && !xen_pv_domain())
> 		apic_bigsmp_force();
>
> ?

Yes, obviously. Thanks for catching that