]> pilppa.com Git - linux-2.6-omap-h63xx.git/commitdiff
ACPI: delete CPU_IDLE=n code
authorLen Brown <len.brown@intel.com>
Fri, 6 Feb 2009 17:24:17 +0000 (12:24 -0500)
committerLen Brown <len.brown@intel.com>
Fri, 6 Feb 2009 17:34:39 +0000 (12:34 -0500)
CPU_IDLE=y has been default for ACPI=y since Nov-2007,
and has shipped in many distributions since then.

Here we delete the CPU_IDLE=n ACPI idle code, since
nobody should be using it, and we don't want to
maintain two versions.

Signed-off-by: Len Brown <len.brown@intel.com>
drivers/acpi/Kconfig
drivers/acpi/processor_idle.c

index d7f9839ba264d34fd0159ba1b70289530129ba4c..c5fc6efdc853fd65e4b91d1f3b2def7144702424 100644 (file)
@@ -9,6 +9,7 @@ menuconfig ACPI
        depends on PCI
        depends on PM
        select PNP
+       select CPU_IDLE
        default y
        ---help---
          Advanced Configuration and Power Interface (ACPI) support for 
index 7eab733ae96e85fd06663ec5a086ea9609d642ea..7bc22a471fe36c384647c5adff2bd3eaf10dd930 100644 (file)
@@ -66,43 +66,17 @@ ACPI_MODULE_NAME("processor_idle");
 #define ACPI_PROCESSOR_FILE_POWER      "power"
 #define US_TO_PM_TIMER_TICKS(t)                ((t * (PM_TIMER_FREQUENCY/1000)) / 1000)
 #define PM_TIMER_TICK_NS               (1000000000ULL/PM_TIMER_FREQUENCY)
-#ifndef CONFIG_CPU_IDLE
-#define C2_OVERHEAD                    4       /* 1us (3.579 ticks per us) */
-#define C3_OVERHEAD                    4       /* 1us (3.579 ticks per us) */
-static void (*pm_idle_save) (void) __read_mostly;
-#else
 #define C2_OVERHEAD                    1       /* 1us */
 #define C3_OVERHEAD                    1       /* 1us */
-#endif
 #define PM_TIMER_TICKS_TO_US(p)                (((p) * 1000)/(PM_TIMER_FREQUENCY/1000))
 
 static unsigned int max_cstate __read_mostly = ACPI_PROCESSOR_MAX_POWER;
-#ifdef CONFIG_CPU_IDLE
 module_param(max_cstate, uint, 0000);
-#else
-module_param(max_cstate, uint, 0644);
-#endif
 static unsigned int nocst __read_mostly;
 module_param(nocst, uint, 0000);
 
-#ifndef CONFIG_CPU_IDLE
-/*
- * bm_history -- bit-mask with a bit per jiffy of bus-master activity
- * 1000 HZ: 0xFFFFFFFF: 32 jiffies = 32ms
- * 800 HZ: 0xFFFFFFFF: 32 jiffies = 40ms
- * 100 HZ: 0x0000000F: 4 jiffies = 40ms
- * reduce history for more aggressive entry into C3
- */
-static unsigned int bm_history __read_mostly =
-    (HZ >= 800 ? 0xFFFFFFFF : ((1U << (HZ / 25)) - 1));
-module_param(bm_history, uint, 0644);
-
-static int acpi_processor_set_power_policy(struct acpi_processor *pr);
-
-#else  /* CONFIG_CPU_IDLE */
 static unsigned int latency_factor __read_mostly = 2;
 module_param(latency_factor, uint, 0644);
-#endif
 
 /*
  * IBM ThinkPad R40e crashes mysteriously when going into C2 or C3.
@@ -224,51 +198,6 @@ static void acpi_safe_halt(void)
        current_thread_info()->status |= TS_POLLING;
 }
 
-#ifndef CONFIG_CPU_IDLE
-
-static void
-acpi_processor_power_activate(struct acpi_processor *pr,
-                             struct acpi_processor_cx *new)
-{
-       struct acpi_processor_cx *old;
-
-       if (!pr || !new)
-               return;
-
-       old = pr->power.state;
-
-       if (old)
-               old->promotion.count = 0;
-       new->demotion.count = 0;
-
-       pr->power.state = new;
-
-       return;
-}
-
-static atomic_t c3_cpu_count;
-
-/* Common C-state entry for C2, C3, .. */
-static void acpi_cstate_enter(struct acpi_processor_cx *cstate)
-{
-       /* Don't trace irqs off for idle */
-       stop_critical_timings();
-       if (cstate->entry_method == ACPI_CSTATE_FFH) {
-               /* Call into architectural FFH based C-state */
-               acpi_processor_ffh_cstate_enter(cstate);
-       } else {
-               int unused;
-               /* IO port based C-state */
-               inb(cstate->address);
-               /* Dummy wait op - must do something useless after P_LVL2 read
-                  because chipsets cannot guarantee that STPCLK# signal
-                  gets asserted in time to freeze execution properly. */
-               unused = inl(acpi_gbl_FADT.xpm_timer_block.address);
-       }
-       start_critical_timings();
-}
-#endif /* !CONFIG_CPU_IDLE */
-
 #ifdef ARCH_APICTIMER_STOPS_ON_C3
 
 /*
@@ -370,421 +299,6 @@ static int tsc_halts_in_c(int state)
 }
 #endif
 
-#ifndef CONFIG_CPU_IDLE
-static void acpi_processor_idle(void)
-{
-       struct acpi_processor *pr = NULL;
-       struct acpi_processor_cx *cx = NULL;
-       struct acpi_processor_cx *next_state = NULL;
-       int sleep_ticks = 0;
-       u32 t1, t2 = 0;
-
-       /*
-        * Interrupts must be disabled during bus mastering calculations and
-        * for C2/C3 transitions.
-        */
-       local_irq_disable();
-
-       pr = __get_cpu_var(processors);
-       if (!pr) {
-               local_irq_enable();
-               return;
-       }
-
-       /*
-        * Check whether we truly need to go idle, or should
-        * reschedule:
-        */
-       if (unlikely(need_resched())) {
-               local_irq_enable();
-               return;
-       }
-
-       cx = pr->power.state;
-       if (!cx || acpi_idle_suspend) {
-               if (pm_idle_save) {
-                       pm_idle_save(); /* enables IRQs */
-               } else {
-                       acpi_safe_halt();
-                       local_irq_enable();
-               }
-
-               return;
-       }
-
-       /*
-        * Check BM Activity
-        * -----------------
-        * Check for bus mastering activity (if required), record, and check
-        * for demotion.
-        */
-       if (pr->flags.bm_check) {
-               u32 bm_status = 0;
-               unsigned long diff = jiffies - pr->power.bm_check_timestamp;
-
-               if (diff > 31)
-                       diff = 31;
-
-               pr->power.bm_activity <<= diff;
-
-               acpi_get_register_unlocked(ACPI_BITREG_BUS_MASTER_STATUS, &bm_status);
-               if (bm_status) {
-                       pr->power.bm_activity |= 0x1;
-                       acpi_set_register(ACPI_BITREG_BUS_MASTER_STATUS, 1);
-               }
-               /*
-                * PIIX4 Erratum #18: Note that BM_STS doesn't always reflect
-                * the true state of bus mastering activity; forcing us to
-                * manually check the BMIDEA bit of each IDE channel.
-                */
-               else if (errata.piix4.bmisx) {
-                       if ((inb_p(errata.piix4.bmisx + 0x02) & 0x01)
-                           || (inb_p(errata.piix4.bmisx + 0x0A) & 0x01))
-                               pr->power.bm_activity |= 0x1;
-               }
-
-               pr->power.bm_check_timestamp = jiffies;
-
-               /*
-                * If bus mastering is or was active this jiffy, demote
-                * to avoid a faulty transition.  Note that the processor
-                * won't enter a low-power state during this call (to this
-                * function) but should upon the next.
-                *
-                * TBD: A better policy might be to fallback to the demotion
-                *      state (use it for this quantum only) istead of
-                *      demoting -- and rely on duration as our sole demotion
-                *      qualification.  This may, however, introduce DMA
-                *      issues (e.g. floppy DMA transfer overrun/underrun).
-                */
-               if ((pr->power.bm_activity & 0x1) &&
-                   cx->demotion.threshold.bm) {
-                       local_irq_enable();
-                       next_state = cx->demotion.state;
-                       goto end;
-               }
-       }
-
-#ifdef CONFIG_HOTPLUG_CPU
-       /*
-        * Check for P_LVL2_UP flag before entering C2 and above on
-        * an SMP system. We do it here instead of doing it at _CST/P_LVL
-        * detection phase, to work cleanly with logical CPU hotplug.
-        */
-       if ((cx->type != ACPI_STATE_C1) && (num_online_cpus() > 1) &&
-           !pr->flags.has_cst && !(acpi_gbl_FADT.flags & ACPI_FADT_C2_MP_SUPPORTED))
-               cx = &pr->power.states[ACPI_STATE_C1];
-#endif
-
-       /*
-        * Sleep:
-        * ------
-        * Invoke the current Cx state to put the processor to sleep.
-        */
-       if (cx->type == ACPI_STATE_C2 || cx->type == ACPI_STATE_C3) {
-               current_thread_info()->status &= ~TS_POLLING;
-               /*
-                * TS_POLLING-cleared state must be visible before we
-                * test NEED_RESCHED:
-                */
-               smp_mb();
-               if (need_resched()) {
-                       current_thread_info()->status |= TS_POLLING;
-                       local_irq_enable();
-                       return;
-               }
-       }
-
-       switch (cx->type) {
-
-       case ACPI_STATE_C1:
-               /*
-                * Invoke C1.
-                * Use the appropriate idle routine, the one that would
-                * be used without acpi C-states.
-                */
-               if (pm_idle_save) {
-                       pm_idle_save(); /* enables IRQs */
-               } else {
-                       acpi_safe_halt();
-                       local_irq_enable();
-               }
-
-               /*
-                * TBD: Can't get time duration while in C1, as resumes
-                *      go to an ISR rather than here.  Need to instrument
-                *      base interrupt handler.
-                *
-                * Note: the TSC better not stop in C1, sched_clock() will
-                *       skew otherwise.
-                */
-               sleep_ticks = 0xFFFFFFFF;
-
-               break;
-
-       case ACPI_STATE_C2:
-               /* Get start time (ticks) */
-               t1 = inl(acpi_gbl_FADT.xpm_timer_block.address);
-               /* Tell the scheduler that we are going deep-idle: */
-               sched_clock_idle_sleep_event();
-               /* Invoke C2 */
-               acpi_state_timer_broadcast(pr, cx, 1);
-               acpi_cstate_enter(cx);
-               /* Get end time (ticks) */
-               t2 = inl(acpi_gbl_FADT.xpm_timer_block.address);
-
-#if defined (CONFIG_GENERIC_TIME) && defined (CONFIG_X86)
-               /* TSC halts in C2, so notify users */
-               if (tsc_halts_in_c(ACPI_STATE_C2))
-                       mark_tsc_unstable("possible TSC halt in C2");
-#endif
-               /* Compute time (ticks) that we were actually asleep */
-               sleep_ticks = ticks_elapsed(t1, t2);
-
-               /* Tell the scheduler how much we idled: */
-               sched_clock_idle_wakeup_event(sleep_ticks*PM_TIMER_TICK_NS);
-
-               /* Re-enable interrupts */
-               local_irq_enable();
-               /* Do not account our idle-switching overhead: */
-               sleep_ticks -= cx->latency_ticks + C2_OVERHEAD;
-
-               current_thread_info()->status |= TS_POLLING;
-               acpi_state_timer_broadcast(pr, cx, 0);
-               break;
-
-       case ACPI_STATE_C3:
-               acpi_unlazy_tlb(smp_processor_id());
-               /*
-                * Must be done before busmaster disable as we might
-                * need to access HPET !
-                */
-               acpi_state_timer_broadcast(pr, cx, 1);
-               /*
-                * disable bus master
-                * bm_check implies we need ARB_DIS
-                * !bm_check implies we need cache flush
-                * bm_control implies whether we can do ARB_DIS
-                *
-                * That leaves a case where bm_check is set and bm_control is
-                * not set. In that case we cannot do much, we enter C3
-                * without doing anything.
-                */
-               if (pr->flags.bm_check && pr->flags.bm_control) {
-                       if (atomic_inc_return(&c3_cpu_count) ==
-                           num_online_cpus()) {
-                               /*
-                                * All CPUs are trying to go to C3
-                                * Disable bus master arbitration
-                                */
-                               acpi_set_register(ACPI_BITREG_ARB_DISABLE, 1);
-                       }
-               } else if (!pr->flags.bm_check) {
-                       /* SMP with no shared cache... Invalidate cache  */
-                       ACPI_FLUSH_CPU_CACHE();
-               }
-
-               /* Get start time (ticks) */
-               t1 = inl(acpi_gbl_FADT.xpm_timer_block.address);
-               /* Invoke C3 */
-               /* Tell the scheduler that we are going deep-idle: */
-               sched_clock_idle_sleep_event();
-               acpi_cstate_enter(cx);
-               /* Get end time (ticks) */
-               t2 = inl(acpi_gbl_FADT.xpm_timer_block.address);
-               if (pr->flags.bm_check && pr->flags.bm_control) {
-                       /* Enable bus master arbitration */
-                       atomic_dec(&c3_cpu_count);
-                       acpi_set_register(ACPI_BITREG_ARB_DISABLE, 0);
-               }
-
-#if defined (CONFIG_GENERIC_TIME) && defined (CONFIG_X86)
-               /* TSC halts in C3, so notify users */
-               if (tsc_halts_in_c(ACPI_STATE_C3))
-                       mark_tsc_unstable("TSC halts in C3");
-#endif
-               /* Compute time (ticks) that we were actually asleep */
-               sleep_ticks = ticks_elapsed(t1, t2);
-               /* Tell the scheduler how much we idled: */
-               sched_clock_idle_wakeup_event(sleep_ticks*PM_TIMER_TICK_NS);
-
-               /* Re-enable interrupts */
-               local_irq_enable();
-               /* Do not account our idle-switching overhead: */
-               sleep_ticks -= cx->latency_ticks + C3_OVERHEAD;
-
-               current_thread_info()->status |= TS_POLLING;
-               acpi_state_timer_broadcast(pr, cx, 0);
-               break;
-
-       default:
-               local_irq_enable();
-               return;
-       }
-       cx->usage++;
-       if ((cx->type != ACPI_STATE_C1) && (sleep_ticks > 0))
-               cx->time += sleep_ticks;
-
-       next_state = pr->power.state;
-
-#ifdef CONFIG_HOTPLUG_CPU
-       /* Don't do promotion/demotion */
-       if ((cx->type == ACPI_STATE_C1) && (num_online_cpus() > 1) &&
-           !pr->flags.has_cst && !(acpi_gbl_FADT.flags & ACPI_FADT_C2_MP_SUPPORTED)) {
-               next_state = cx;
-               goto end;
-       }
-#endif
-
-       /*
-        * Promotion?
-        * ----------
-        * Track the number of longs (time asleep is greater than threshold)
-        * and promote when the count threshold is reached.  Note that bus
-        * mastering activity may prevent promotions.
-        * Do not promote above max_cstate.
-        */
-       if (cx->promotion.state &&
-           ((cx->promotion.state - pr->power.states) <= max_cstate)) {
-               if (sleep_ticks > cx->promotion.threshold.ticks &&
-                 cx->promotion.state->latency <=
-                               pm_qos_requirement(PM_QOS_CPU_DMA_LATENCY)) {
-                       cx->promotion.count++;
-                       cx->demotion.count = 0;
-                       if (cx->promotion.count >=
-                           cx->promotion.threshold.count) {
-                               if (pr->flags.bm_check) {
-                                       if (!
-                                           (pr->power.bm_activity & cx->
-                                            promotion.threshold.bm)) {
-                                               next_state =
-                                                   cx->promotion.state;
-                                               goto end;
-                                       }
-                               } else {
-                                       next_state = cx->promotion.state;
-                                       goto end;
-                               }
-                       }
-               }
-       }
-
-       /*
-        * Demotion?
-        * ---------
-        * Track the number of shorts (time asleep is less than time threshold)
-        * and demote when the usage threshold is reached.
-        */
-       if (cx->demotion.state) {
-               if (sleep_ticks < cx->demotion.threshold.ticks) {
-                       cx->demotion.count++;
-                       cx->promotion.count = 0;
-                       if (cx->demotion.count >= cx->demotion.threshold.count) {
-                               next_state = cx->demotion.state;
-                               goto end;
-                       }
-               }
-       }
-
-      end:
-       /*
-        * Demote if current state exceeds max_cstate
-        * or if the latency of the current state is unacceptable
-        */
-       if ((pr->power.state - pr->power.states) > max_cstate ||
-               pr->power.state->latency >
-                               pm_qos_requirement(PM_QOS_CPU_DMA_LATENCY)) {
-               if (cx->demotion.state)
-                       next_state = cx->demotion.state;
-       }
-
-       /*
-        * New Cx State?
-        * -------------
-        * If we're going to start using a new Cx state we must clean up
-        * from the previous and prepare to use the new.
-        */
-       if (next_state != pr->power.state)
-               acpi_processor_power_activate(pr, next_state);
-}
-
-static int acpi_processor_set_power_policy(struct acpi_processor *pr)
-{
-       unsigned int i;
-       unsigned int state_is_set = 0;
-       struct acpi_processor_cx *lower = NULL;
-       struct acpi_processor_cx *higher = NULL;
-       struct acpi_processor_cx *cx;
-
-
-       if (!pr)
-               return -EINVAL;
-
-       /*
-        * This function sets the default Cx state policy (OS idle handler).
-        * Our scheme is to promote quickly to C2 but more conservatively
-        * to C3.  We're favoring C2  for its characteristics of low latency
-        * (quick response), good power savings, and ability to allow bus
-        * mastering activity.  Note that the Cx state policy is completely
-        * customizable and can be altered dynamically.
-        */
-
-       /* startup state */
-       for (i = 1; i < ACPI_PROCESSOR_MAX_POWER; i++) {
-               cx = &pr->power.states[i];
-               if (!cx->valid)
-                       continue;
-
-               if (!state_is_set)
-                       pr->power.state = cx;
-               state_is_set++;
-               break;
-       }
-
-       if (!state_is_set)
-               return -ENODEV;
-
-       /* demotion */
-       for (i = 1; i < ACPI_PROCESSOR_MAX_POWER; i++) {
-               cx = &pr->power.states[i];
-               if (!cx->valid)
-                       continue;
-
-               if (lower) {
-                       cx->demotion.state = lower;
-                       cx->demotion.threshold.ticks = cx->latency_ticks;
-                       cx->demotion.threshold.count = 1;
-                       if (cx->type == ACPI_STATE_C3)
-                               cx->demotion.threshold.bm = bm_history;
-               }
-
-               lower = cx;
-       }
-
-       /* promotion */
-       for (i = (ACPI_PROCESSOR_MAX_POWER - 1); i > 0; i--) {
-               cx = &pr->power.states[i];
-               if (!cx->valid)
-                       continue;
-
-               if (higher) {
-                       cx->promotion.state = higher;
-                       cx->promotion.threshold.ticks = cx->latency_ticks;
-                       if (cx->type >= ACPI_STATE_C2)
-                               cx->promotion.threshold.count = 4;
-                       else
-                               cx->promotion.threshold.count = 10;
-                       if (higher->type == ACPI_STATE_C3)
-                               cx->promotion.threshold.bm = bm_history;
-               }
-
-               higher = cx;
-       }
-
-       return 0;
-}
-#endif /* !CONFIG_CPU_IDLE */
-
 static int acpi_processor_get_power_info_fadt(struct acpi_processor *pr)
 {
 
@@ -1027,11 +541,7 @@ static void acpi_processor_power_verify_c2(struct acpi_processor_cx *cx)
         */
        cx->valid = 1;
 
-#ifndef CONFIG_CPU_IDLE
-       cx->latency_ticks = US_TO_PM_TIMER_TICKS(cx->latency);
-#else
        cx->latency_ticks = cx->latency;
-#endif
 
        return;
 }
@@ -1111,11 +621,7 @@ static void acpi_processor_power_verify_c3(struct acpi_processor *pr,
         */
        cx->valid = 1;
 
-#ifndef CONFIG_CPU_IDLE
-       cx->latency_ticks = US_TO_PM_TIMER_TICKS(cx->latency);
-#else
        cx->latency_ticks = cx->latency;
-#endif
        /*
         * On older chipsets, BM_RLD needs to be set
         * in order for Bus Master activity to wake the
@@ -1189,20 +695,6 @@ static int acpi_processor_get_power_info(struct acpi_processor *pr)
 
        pr->power.count = acpi_processor_power_verify(pr);
 
-#ifndef CONFIG_CPU_IDLE
-       /*
-        * Set Default Policy
-        * ------------------
-        * Now that we know which states are supported, set the default
-        * policy.  Note that this policy can be changed dynamically
-        * (e.g. encourage deeper sleeps to conserve battery life when
-        * not on AC).
-        */
-       result = acpi_processor_set_power_policy(pr);
-       if (result)
-               return result;
-#endif
-
        /*
         * if one state of type C2 or C3 is available, mark this
         * CPU as being "idle manageable"
@@ -1300,69 +792,6 @@ static const struct file_operations acpi_processor_power_fops = {
        .release = single_release,
 };
 
-#ifndef CONFIG_CPU_IDLE
-
-int acpi_processor_cst_has_changed(struct acpi_processor *pr)
-{
-       int result = 0;
-
-       if (boot_option_idle_override)
-               return 0;
-
-       if (!pr)
-               return -EINVAL;
-
-       if (nocst) {
-               return -ENODEV;
-       }
-
-       if (!pr->flags.power_setup_done)
-               return -ENODEV;
-
-       /*
-        * Fall back to the default idle loop, when pm_idle_save had
-        * been initialized.
-        */
-       if (pm_idle_save) {
-               pm_idle = pm_idle_save;
-               /* Relies on interrupts forcing exit from idle. */
-               synchronize_sched();
-       }
-
-       pr->flags.power = 0;
-       result = acpi_processor_get_power_info(pr);
-       if ((pr->flags.power == 1) && (pr->flags.power_setup_done))
-               pm_idle = acpi_processor_idle;
-
-       return result;
-}
-
-#ifdef CONFIG_SMP
-static void smp_callback(void *v)
-{
-       /* we already woke the CPU up, nothing more to do */
-}
-
-/*
- * This function gets called when a part of the kernel has a new latency
- * requirement.  This means we need to get all processors out of their C-state,
- * and then recalculate a new suitable C-state. Just do a cross-cpu IPI; that
- * wakes them all right up.
- */
-static int acpi_processor_latency_notify(struct notifier_block *b,
-               unsigned long l, void *v)
-{
-       smp_call_function(smp_callback, NULL, 1);
-       return NOTIFY_OK;
-}
-
-static struct notifier_block acpi_processor_latency_notifier = {
-       .notifier_call = acpi_processor_latency_notify,
-};
-
-#endif
-
-#else /* CONFIG_CPU_IDLE */
 
 /**
  * acpi_idle_bm_check - checks if bus master activity was detected
@@ -1756,8 +1185,6 @@ int acpi_processor_cst_has_changed(struct acpi_processor *pr)
        return ret;
 }
 
-#endif /* CONFIG_CPU_IDLE */
-
 int __cpuinit acpi_processor_power_init(struct acpi_processor *pr,
                              struct acpi_device *device)
 {
@@ -1786,10 +1213,6 @@ int __cpuinit acpi_processor_power_init(struct acpi_processor *pr,
                               "ACPI: processor limited to max C-state %d\n",
                               max_cstate);
                first_run++;
-#if !defined(CONFIG_CPU_IDLE) && defined(CONFIG_SMP)
-               pm_qos_add_notifier(PM_QOS_CPU_DMA_LATENCY,
-                               &acpi_processor_latency_notifier);
-#endif
        }
 
        if (!pr)
@@ -1813,11 +1236,9 @@ int __cpuinit acpi_processor_power_init(struct acpi_processor *pr,
         * platforms that only support C1.
         */
        if (pr->flags.power) {
-#ifdef CONFIG_CPU_IDLE
                acpi_processor_setup_cpuidle(pr);
                if (cpuidle_register_device(&pr->power.dev))
                        return -EIO;
-#endif
 
                printk(KERN_INFO PREFIX "CPU%d (power states:", pr->id);
                for (i = 1; i <= pr->power.count; i++)
@@ -1825,13 +1246,6 @@ int __cpuinit acpi_processor_power_init(struct acpi_processor *pr,
                                printk(" C%d[C%d]", i,
                                       pr->power.states[i].type);
                printk(")\n");
-
-#ifndef CONFIG_CPU_IDLE
-               if (pr->id == 0) {
-                       pm_idle_save = pm_idle;
-                       pm_idle = acpi_processor_idle;
-               }
-#endif
        }
 
        /* 'power' [R] */
@@ -1850,34 +1264,12 @@ int acpi_processor_power_exit(struct acpi_processor *pr,
        if (boot_option_idle_override)
                return 0;
 
-#ifdef CONFIG_CPU_IDLE
        cpuidle_unregister_device(&pr->power.dev);
-#endif
        pr->flags.power_setup_done = 0;
 
        if (acpi_device_dir(device))
                remove_proc_entry(ACPI_PROCESSOR_FILE_POWER,
                                  acpi_device_dir(device));
 
-#ifndef CONFIG_CPU_IDLE
-
-       /* Unregister the idle handler when processor #0 is removed. */
-       if (pr->id == 0) {
-               if (pm_idle_save)
-                       pm_idle = pm_idle_save;
-
-               /*
-                * We are about to unload the current idle thread pm callback
-                * (pm_idle), Wait for all processors to update cached/local
-                * copies of pm_idle before proceeding.
-                */
-               cpu_idle_wait();
-#ifdef CONFIG_SMP
-               pm_qos_remove_notifier(PM_QOS_CPU_DMA_LATENCY,
-                               &acpi_processor_latency_notifier);
-#endif
-       }
-#endif
-
        return 0;
 }