cpuidle: allow governor switch on cpuidle_register_driver()
commit 11c59eae6633b8a7e77b8ee1cf908964d80c78cd upstream The recently introduced haltpoll driver is largely only useful with haltpoll governor. To allow drivers to associate with a particular idle behaviour, add a @governor property to 'struct cpuidle_driver' and thus allow a cpuidle driver to switch to a *preferred* governor on idle driver registration. We save the previous governor, and when an idle driver is unregistered we switch back to that. The @governor can be overridden by cpuidle.governor= boot param or alternatively be ignored if the governor doesn't exist. Signed-off-by: NJoao Martins <joao.m.martins@oracle.com> Signed-off-by: NRafael J. Wysocki <rafael.j.wysocki@intel.com> Signed-off-by: NYihao Wu <wuyihao@linux.alibaba.com> Acked-by: NMichael Wang <yun.wang@linux.alibaba.com>
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