Re: [PATCH -v3] x86: Disable x2apic if nox2apic is specified

[Suresh Siddha]

On Tue, 2010-10-26 at 23:27 -0700, Yinghai Lu wrote:
> For
> 1. x2apic preenabled system
> 2. first kernel have x2apic enabled, and try to kexec second kernel with "nox2apic"
> 
> Will put back cpu with apic id < 255 into xapic mode, instead of panic.
> 
> -v2: use x2apic_disabled instead of nox2apic, Suggested by Thomas
>      update x2apic_supported with x2apic_disabled, Suggested by Thomas
> 
> -v3: add checking for boot cpu apic id > 255. in that case will just panic
>      --- pointed out by Suresh.
> 

Can we please hold off in merging this patch for a bit? There are some
subtleties in going back to xapic when the platform/cpu's are in x2apic
mode. I will check and get back to you on this after KS.

thanks,
suresh

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