On Wed, 30 Sep 2015, Denys Vlasenko wrote:
> On 09/30/2015 05:11 PM, Thomas Gleixner wrote:
> > On Fri, 25 Sep 2015, Denys Vlasenko wrote:
> >>
> >> +config MAX_LAPIC_ID
> >> + int "Maximum APIC ID"
> >> + range 8 32768
> >> + default "8"
> >> + ---help---
> >> + Use this option to set maximum allowed Local APIC ID higher than
> >> + maximum number of CPUs. This may be necessary for machines
> >> + with large number of processor sockets and non-contiguous
> >> + LAPIC numbering.
> >> + This setting will be automatically rounded up, if necessary.
> >
> > This is wrong. If you would limit the APIC IDs then you really break
> > stuff. You can only limit the number of APICs.
>
> This CONFIG setting allows to _increase_ max APIC ID.
NO. This is crap. I don't want to tweak a gazillion of knobs just to
build a kernel with CONFIG_NR_CPUS=8. Really not.
If you really want to make that space saving, then make it a runtime
allocation.
Thanks,
tglx
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