Why not just NULL out the cpu_power function pointers on platforms
that don't have the feature bit instead? (or the other way around:
NULL by default, and set only on platforms that have imbalanced threads.
It'd be even nicer to do so without using up a cpu feature bit, since
it'd then only be used in determining whether to set the ppc_md
function pointer or not, but I don't know if there's a convenient way
to probe for this at runtime (cpu device tree node properties?).
-Olof
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