Merge branch 'pm-cpuidle'

* pm-cpuidle:
  cpuidle: Remove time measurement in poll state
  cpuidle: Remove manual selection of the multiple driver support
  cpuidle: ladder governor - use macro instead of hardcoded value
  cpuidle: big_little: Fix build error
  cpuidle: menu governor - remove unused macro STDDEV_THRESH
  cpuidle: fix permission for driver name sysfs node
  cpuidle: move idle traces to cpuidle_enter_state()

drivers/cpuidle/Kconfig

@@ -15,12 +15,7 @@ config CPU_IDLE
 if CPU_IDLE
 
 config CPU_IDLE_MULTIPLE_DRIVERS
-        bool "Support multiple cpuidle drivers"
+        bool
-        default n
-        help
-         Allows the cpuidle framework to use different drivers for each CPU.
-         This is useful if you have a system with different CPU latencies and
-         states. If unsure say N.
 
 config CPU_IDLE_GOV_LADDER
 	bool "Ladder governor (for periodic timer tick)"

drivers/cpuidle/Kconfig.arm

@@ -10,6 +10,7 @@ config ARM_ARMADA_370_XP_CPUIDLE
 config ARM_BIG_LITTLE_CPUIDLE
 	bool "Support for ARM big.LITTLE processors"
 	depends on ARCH_VEXPRESS_TC2_PM
+	depends on MCPM
 	select ARM_CPU_SUSPEND
 	select CPU_IDLE_MULTIPLE_DRIVERS
 	help

drivers/cpuidle/cpuidle.c

@@ -119,11 +119,13 @@ int cpuidle_enter_state(struct cpuidle_device *dev, struct cpuidle_driver *drv,
 	ktime_t time_start, time_end;
 	s64 diff;
 
+	trace_cpu_idle_rcuidle(index, dev->cpu);
 	time_start = ktime_get();
 
 	entered_state = target_state->enter(dev, drv, index);
 
 	time_end = ktime_get();
+	trace_cpu_idle_rcuidle(PWR_EVENT_EXIT, dev->cpu);
 
 	if (!cpuidle_state_is_coupled(dev, drv, entered_state))
 		local_irq_enable();

drivers/cpuidle/driver.c

@@ -182,10 +182,6 @@ static void __cpuidle_driver_init(struct cpuidle_driver *drv)
 static int poll_idle(struct cpuidle_device *dev,
 		struct cpuidle_driver *drv, int index)
 {
-	ktime_t	t1, t2;
-	s64 diff;
-
-	t1 = ktime_get();
 	local_irq_enable();
 	if (!current_set_polling_and_test()) {
 		while (!need_resched())
@@ -193,13 +189,6 @@ static int poll_idle(struct cpuidle_device *dev,
 	}
 	current_clr_polling();
 
-	t2 = ktime_get();
-	diff = ktime_to_us(ktime_sub(t2, t1));
-	if (diff > INT_MAX)
-		diff = INT_MAX;
-
-	dev->last_residency = (int) diff;
-
 	return index;
 }
 

drivers/cpuidle/governors/ladder.c

@@ -144,7 +144,7 @@ static int ladder_enable_device(struct cpuidle_driver *drv,
 
 	ldev->last_state_idx = CPUIDLE_DRIVER_STATE_START;
 
-	for (i = 0; i < drv->state_count; i++) {
+	for (i = CPUIDLE_DRIVER_STATE_START; i < drv->state_count; i++) {
 		state = &drv->states[i];
 		lstate = &ldev->states[i];
 
@@ -156,7 +156,7 @@ static int ladder_enable_device(struct cpuidle_driver *drv,
 
 		if (i < drv->state_count - 1)
 			lstate->threshold.promotion_time = state->exit_latency;
-		if (i > 0)
+		if (i > CPUIDLE_DRIVER_STATE_START)
 			lstate->threshold.demotion_time = state->exit_latency;
 	}
 

drivers/cpuidle/governors/menu.c

@@ -35,7 +35,6 @@
 #define RESOLUTION 1024
 #define DECAY 8
 #define MAX_INTERESTING 50000
-#define STDDEV_THRESH 400
 
 
 /*

drivers/cpuidle/sysfs.c

@@ -445,7 +445,7 @@ static void cpuidle_remove_state_sysfs(struct cpuidle_device *device)
 
 #define define_one_driver_ro(_name, show)                       \
 	static struct cpuidle_driver_attr attr_driver_##_name = \
-		__ATTR(_name, 0644, show, NULL)
+		__ATTR(_name, 0444, show, NULL)
 
 struct cpuidle_driver_kobj {
 	struct cpuidle_driver *drv;

kernel/sched/idle.c

@@ -147,8 +147,6 @@ use_default:
 	    clockevents_notify(CLOCK_EVT_NOTIFY_BROADCAST_ENTER, &dev->cpu))
 		goto use_default;
 
-	trace_cpu_idle_rcuidle(next_state, dev->cpu);
-
 	/*
 	 * Enter the idle state previously returned by the governor decision.
 	 * This function will block until an interrupt occurs and will take
@@ -156,8 +154,6 @@ use_default:
 	 */
 	entered_state = cpuidle_enter(drv, dev, next_state);
 
-	trace_cpu_idle_rcuidle(PWR_EVENT_EXIT, dev->cpu);
-
 	if (broadcast)
 		clockevents_notify(CLOCK_EVT_NOTIFY_BROADCAST_EXIT, &dev->cpu);