On a P4 with HT, I'm trying to get the logical processor ID (SMT_ID) for
the currently executing thread in kernel mode.  The SMT_ID is part of
the APIC_ID which is in EBX[24:16] after calling cpuid with EAX=1.

Is the SMT_ID or APIC_ID per_cpu cached by the kernel anywhere?

Thanks,

-bryan
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