sched/idle: Remove stale old file

/*

 * Generic entry point for the idle threads

 */

#include <linux/sched.h>

#include <linux/cpu.h>

#include <linux/cpuidle.h>

#include <linux/tick.h>

#include <linux/mm.h>

#include <linux/stackprotector.h>

#include <asm/tlb.h>

#include <trace/events/power.h>

static int __read_mostly cpu_idle_force_poll;

void cpu_idle_poll_ctrl(bool enable)

{

	if (enable) {

		cpu_idle_force_poll++;

	} else {

		cpu_idle_force_poll--;

		WARN_ON_ONCE(cpu_idle_force_poll < 0);

	}

}

#ifdef CONFIG_GENERIC_IDLE_POLL_SETUP

static int __init cpu_idle_poll_setup(char *__unused)

{

	cpu_idle_force_poll = 1;

	return 1;

}

__setup("nohlt", cpu_idle_poll_setup);

static int __init cpu_idle_nopoll_setup(char *__unused)

{

	cpu_idle_force_poll = 0;

	return 1;

}

__setup("hlt", cpu_idle_nopoll_setup);

#endif

static inline int cpu_idle_poll(void)

{

	rcu_idle_enter();

	trace_cpu_idle_rcuidle(0, smp_processor_id());

	local_irq_enable();

	while (!tif_need_resched())

		cpu_relax();

	trace_cpu_idle_rcuidle(PWR_EVENT_EXIT, smp_processor_id());

	rcu_idle_exit();

	return 1;

}

/* Weak implementations for optional arch specific functions */

void __weak arch_cpu_idle_prepare(void) { }

void __weak arch_cpu_idle_enter(void) { }

void __weak arch_cpu_idle_exit(void) { }

void __weak arch_cpu_idle_dead(void) { }

void __weak arch_cpu_idle(void)

{

	cpu_idle_force_poll = 1;

	local_irq_enable();

}

/*

 * Generic idle loop implementation

 */

static void cpu_idle_loop(void)

{

	while (1) {

		tick_nohz_idle_enter();

		while (!need_resched()) {

			check_pgt_cache();

			rmb();

			if (cpu_is_offline(smp_processor_id()))

				arch_cpu_idle_dead();

			local_irq_disable();

			arch_cpu_idle_enter();

			/*

			 * In poll mode we reenable interrupts and spin.

			 *

			 * Also if we detected in the wakeup from idle

			 * path that the tick broadcast device expired

			 * for us, we don't want to go deep idle as we

			 * know that the IPI is going to arrive right

			 * away

			 */

			if (cpu_idle_force_poll || tick_check_broadcast_expired()) {

				cpu_idle_poll();

			} else {

				if (!current_clr_polling_and_test()) {

					stop_critical_timings();

					rcu_idle_enter();

					if (cpuidle_idle_call())

						arch_cpu_idle();

					if (WARN_ON_ONCE(irqs_disabled()))

						local_irq_enable();

					rcu_idle_exit();

					start_critical_timings();

				} else {

					local_irq_enable();

				}

				__current_set_polling();

			}

			arch_cpu_idle_exit();

		}

		/*

		 * Since we fell out of the loop above, we know

		 * TIF_NEED_RESCHED must be set, propagate it into

		 * PREEMPT_NEED_RESCHED.

		 *

		 * This is required because for polling idle loops we will

		 * not have had an IPI to fold the state for us.

		 */

		preempt_set_need_resched();

		tick_nohz_idle_exit();

		schedule_preempt_disabled();

	}

}

void cpu_startup_entry(enum cpuhp_state state)

{

	/*

	 * This #ifdef needs to die, but it's too late in the cycle to

	 * make this generic (arm and sh have never invoked the canary

	 * init for the non boot cpus!). Will be fixed in 3.11

	 */

#ifdef CONFIG_X86

	/*

	 * If we're the non-boot CPU, nothing set the stack canary up

	 * for us. The boot CPU already has it initialized but no harm

	 * in doing it again. This is a good place for updating it, as

	 * we wont ever return from this function (so the invalid

	 * canaries already on the stack wont ever trigger).

	 */

	boot_init_stack_canary();

#endif

	__current_set_polling();

	arch_cpu_idle_prepare();

	cpu_idle_loop();

}

				__current_set_polling();

			}

			arch_cpu_idle_exit();

		}

		/*

			 * We need to test and propagate the TIF_NEED_RESCHED

			 * bit here because we might not have send the

			 * reschedule IPI to idle tasks.

		 * Since we fell out of the loop above, we know

		 * TIF_NEED_RESCHED must be set, propagate it into

		 * PREEMPT_NEED_RESCHED.

		 *

		 * This is required because for polling idle loops we will

		 * not have had an IPI to fold the state for us.

		 */

			if (tif_need_resched())

				set_preempt_need_resched();

		}

		preempt_set_need_resched();

		tick_nohz_idle_exit();

		schedule_preempt_disabled();

	}