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SubjectRe: [BUG] x86 kenel won't boot under Virtual PC
Jan Beulich wrote:
>
> I disagree here: If I configure a 686+ kernel, I expect these NOPs to be
> that way (and to work). If you want to run on something that's not
> compliant, you just shouldn't configure your kernel that way.
>

Okay, we do not generate P6 NOPs statically if CONFIG_X86_GENERIC_CPU is
enabled -- unless, of course gcc/binutils generates them, which they now
do for certain CPU types. If you are selecting a specific CPU *and* you
don't select GENERIC, you should get valid code for the selected CPU only.

As far as using them dynamically, there is code in -tip that determines
dynamically and explicitly if the long NOPs are available, and only uses
them if they are.

-hpa


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