Determining CPU topology on multi-core CPUs

[Joseph Koshy]

On multi-core P4/HTT CPU packages I need to distinguish between
physically distinct CPUs in separate cores from HT CPU
(a.k.a., 'threads') pairs.

What is the best way a driver can obtain the CPU topology
of a system?

The bits in 'logical_cpus_mask'  do not distinguish between
multi-core and HT cpus.

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