Re: [Xen-devel] [PATCH] x86/apic: remove the legacy bigsmp APIC driver

[Keir Fraser <keir.xen@xxxxxxxxx>]

On 27/08/2013 09:17, "Jan Beulich" <JBeulich@xxxxxxxx> wrote:

>>>> On 27.08.13 at 07:44, Matt Wilson <msw@xxxxxxxxxx> wrote:
>> The bigsmp APIC driver was used on legacy (32-bit only) x86 platforms
>> with 8 or more CPUs. In Linux the X86_BIGSMP Kconfig option depends on
>> X86_32. Since we no longer support 32-bit hypervisors on the x86
>> platform we can remove this code.
> 
> The fact that this is 32-bit only in Linux doesn't mean anything.
> Linux has other 64-bit only models, which we don't have (in
> favor of, originally, having a single shared implementation).
> 
> On a system without x2APIC but more than 8 CPUs - how would
> you see us bringing up the CPUs beyond 8? This is particularly
> shown by your adjustment to MP_processor_info_x(), which is
> code removal without replacement.
>
> Despite Keir's ack, unless I'm overlooking something I'm explicitly
> nack-ing this.

Thanks. You are right of course. Oops!
 
> Jan
> 



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