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arm64: wrap and generalise counter read functions
In preparation for other uses of Activity Monitors (AMU) cycle counters, place counter read functionality in generic functions that can reused: read_corecnt() and read_constcnt(). As a result, implement update_freq_counters_refs() to replace init_cpu_freq_invariance_counters() and both initialise and update the per-cpu reference variables. Signed-off-by: Ionela Voinescu <ionela.voinescu@arm.com> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Will Deacon <will@kernel.org>
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