powercap / idle_inject: Add an idle injection framework
Initially, the cpu_cooling device for ARM was changed by adding a new policy inserting idle cycles. The intel_powerclamp driver does a similar action. Instead of implementing idle injections privately in the cpu_cooling device, move the idle injection code in a dedicated framework and give the opportunity to other frameworks to make use of it. The framework relies on the smpboot kthreads which handles via its main loop the common code for hotplugging and [un]parking. This code was previously tested with the cpu cooling device and went through several iterations. It results now in split code and API exported in the header file. It was tested with the cpu cooling device with success. Signed-off-by: NDaniel Lezcano <daniel.lezcano@linaro.org> Reviewed-by: NViresh Kumar <viresh.kumar@linaro.org> [ rjw: Rewrite of all comments ] Signed-off-by: NRafael J. Wysocki <rafael.j.wysocki@intel.com>
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drivers/powercap/idle_inject.c
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include/linux/idle_inject.h
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