Merge "cpu/hotplug: Ensure that sched domains are rebuilt before hotplug"

#include <linux/percpu-rwsem.h>

#include <uapi/linux/sched/types.h>

#include <linux/highmem.h>

#include <linux/cpuset.h>

#include <trace/events/power.h>

#define CREATE_TRACE_POINTS

{

	int err;

	/*

	 * When cpusets are enabled, the rebuilding of the scheduling

	 * domains is deferred to a workqueue context. Make sure

	 * that the work is completed before proceeding to the next

	 * hotplug. Otherwise scheduler observes an inconsistent

	 * view of online and offline CPUs in the root domain. If

	 * the online CPUs are still stuck in the offline (default)

	 * domain, those CPUs would not be visible when scheduling

	 * happens on from other CPUs in the root domain.

	 */

	cpuset_wait_for_hotplug();

	cpu_maps_update_begin();

	err = cpu_down_maps_locked(cpu, target);

	cpu_maps_update_done();

		return -EINVAL;

	}

	cpuset_wait_for_hotplug();

	switch_err = switch_to_rt_policy();

	if (switch_err < 0)

		return switch_err;