intel_pstate: Improve initial busy calculation
This change makes the busy calculation using 64 bit math which prevents overflow for large values of aperf/mperf. Cc: 3.14+ <stable@vger.kernel.org> # 3.14+ Signed-off-by: NDoug Smythies <dsmythies@telus.net> Signed-off-by: NDirk Brandewie <dirk.j.brandewie@intel.com> Signed-off-by: NRafael J. Wysocki <rafael.j.wysocki@intel.com>
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