Merge "sched: Remove synchronize rcu/sched calls from _cpu_down"

	int ret;

	set_cpu_active(cpu, false);

	/*

	 * We've cleared cpu_active_mask, wait for all preempt-disabled and RCU

	 * users of this state to go away such that all new such users will

	 * observe it.

	 *

	 * For CONFIG_PREEMPT we have preemptible RCU and its sync_rcu() might

	 * not imply sync_sched(), so wait for both.

	 *

	 * Do sync before park smpboot threads to take care the rcu boost case.

	 */

	if (IS_ENABLED(CONFIG_PREEMPT))

		synchronize_rcu_mult(call_rcu, call_rcu_sched);

	else

		synchronize_rcu();

	if (!sched_smp_initialized)

		return 0;