cpufreq: Convert the cpufreq_driver_lock to a rwlock
This eliminates the contention I am seeing in __cpufreq_cpu_get. It also nicely stages the lock to be replaced by the rcu. Signed-off-by: NNathan Zimmer <nzimmer@sgi.com> Acked-by: NViresh Kumar <viresh.kumar@linaro.org> Signed-off-by: NRafael J. Wysocki <rafael.j.wysocki@intel.com>
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