powerpc/smp: Rework CPU topology construction
The CPU scheduler topology is constructed from a number of per-cpu cpumasks which describe which sets of logical CPUs are related in some fashion. Current code that handles constructing these masks when CPUs are hot(un)plugged can be simplified a bit by exploiting the fact that the scheduler requires higher levels of the toplogy (e.g package level groupings) to be supersets of the lower levels (e.g. threas in a core). This patch reworks the cpumask construction to be simpler and easier to extend with extra topology levels. Signed-off-by:Oliver O'Halloran <oohall@gmail.com> [mpe: Fix CONFIG_HOTPLUG_CPU=n build] Signed-off-by:
Michael Ellerman <mpe@ellerman.id.au>
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