Simon Arlott wrote:
>
> Is it automatic? I have CONFIG_X86_CMPXCHG=y without cx8 showing in
> cpuinfo, and it appears to work fine.
>
> Will your changes needlessly prevent the kernel running? Would I be
> right in thinking that the kernel is successfully using cmpxchg even
> though it's considered disabled? I realise people compile kernels for
> the wrong CPU but preventing them working when it's been chosen
> correctly seems wrong.
>
CX8 isn't cmpxchg; it's cmpxchg8b.
-hpa
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