pm_qos_add_notifier  751 drivers/cpuidle/cpuidle.c 	pm_qos_add_notifier(PM_QOS_CPU_DMA_LATENCY, n);
pm_qos_add_notifier  128 include/linux/pm_qos.h int pm_qos_add_notifier(int pm_qos_class, struct notifier_block *notifier);
pm_qos_add_notifier  509 kernel/power/qos.c EXPORT_SYMBOL_GPL(pm_qos_add_notifier);