Merge branch 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux

* 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux: (35 commits)
  PM idle: remove global declaration of pm_idle
  unicore32 idle: delete stray pm_idle comment
  openrisc idle: delete pm_idle
  mn10300 idle: delete pm_idle
  microblaze idle: delete pm_idle
  m32r idle: delete pm_idle, and other dead idle code
  ia64 idle: delete pm_idle
  cris idle: delete idle and pm_idle
  ARM64 idle: delete pm_idle
  ARM idle: delete pm_idle
  blackfin idle: delete pm_idle
  sparc idle: rename pm_idle to sparc_idle
  sh idle: rename global pm_idle to static sh_idle
  x86 idle: rename global pm_idle to static x86_idle
  APM idle: register apm_cpu_idle via cpuidle
  tools/power turbostat: display SMI count by default
  intel_idle: export both C1 and C1E
  cpuidle: remove vestage definition of cpuidle_state_usage.driver_data
  x86 idle: remove 32-bit-only "no-hlt" parameter, hlt_works_ok flag
  x86 idle: remove mwait_idle() and "idle=mwait" cmdline param
  ...

Conflicts:
	arch/x86/kernel/process.c (with PM / tracing commit 43720bd)
	drivers/acpi/processor_idle.c (with ACPICA commit 4f84291)

35 files changed, 360 insertions, 553 deletions

diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 41c5d9ecd9b..4c5b3f993bb 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -1039,16 +1039,11 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
 			Claim all unknown PCI IDE storage controllers.
 
 	idle=		[X86]
-			Format: idle=poll, idle=mwait, idle=halt, idle=nomwait
+			Format: idle=poll, idle=halt, idle=nomwait
 			Poll forces a polling idle loop that can slightly
 			improve the performance of waking up a idle CPU, but
 			will use a lot of power and make the system run hot.
 			Not recommended.
-			idle=mwait: On systems which support MONITOR/MWAIT but
-			the kernel chose to not use it because it doesn't save
-			as much power as a normal idle loop, use the
-			MONITOR/MWAIT idle loop anyways. Performance should be
-			the same as idle=poll.
 			idle=halt: Halt is forced to be used for CPU idle.
 			In such case C2/C3 won't be used again.
 			idle=nomwait: Disable mwait for CPU C-states
@@ -1891,10 +1886,6 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
 			wfi(ARM) instruction doesn't work correctly and not to
 			use it. This is also useful when using JTAG debugger.
 
-	no-hlt		[BUGS=X86-32] Tells the kernel that the hlt
-			instruction doesn't work correctly and not to
-			use it.
-
 	no_file_caps	Tells the kernel not to honor file capabilities.  The
 			only way then for a file to be executed with privilege
 			is to be setuid root or executed by root.
diff --git a/arch/arm/kernel/process.c b/arch/arm/kernel/process.c
index c6dec5fc20a..047d3e40e47 100644
--- a/arch/arm/kernel/process.c
+++ b/arch/arm/kernel/process.c
@@ -172,14 +172,9 @@ static void default_idle(void)
 	local_irq_enable();
 }
 
-void (*pm_idle)(void) = default_idle;
-EXPORT_SYMBOL(pm_idle);
-
 /*
- * The idle thread, has rather strange semantics for calling pm_idle,
- * but this is what x86 does and we need to do the same, so that
- * things like cpuidle get called in the same way.  The only difference
- * is that we always respect 'hlt_counter' to prevent low power idle.
+ * The idle thread.
+ * We always respect 'hlt_counter' to prevent low power idle.
  */
 void cpu_idle(void)
 {
@@ -210,10 +205,10 @@ void cpu_idle(void)
 			} else if (!need_resched()) {
 				stop_critical_timings();
 				if (cpuidle_idle_call())
-					pm_idle();
+					default_idle();
 				start_critical_timings();
 				/*
-				 * pm_idle functions must always
+				 * default_idle functions must always
 				 * return with IRQs enabled.
 				 */
 				WARN_ON(irqs_disabled());
diff --git a/arch/arm/mach-davinci/cpuidle.c b/arch/arm/mach-davinci/cpuidle.c
index 9107691adbd..5ac9e9384b1 100644
--- a/arch/arm/mach-davinci/cpuidle.c
+++ b/arch/arm/mach-davinci/cpuidle.c
@@ -25,35 +25,44 @@
 
 #define DAVINCI_CPUIDLE_MAX_STATES	2
 
-struct davinci_ops {
-	void (*enter) (u32 flags);
-	void (*exit) (u32 flags);
-	u32 flags;
-};
+static DEFINE_PER_CPU(struct cpuidle_device, davinci_cpuidle_device);
+static void __iomem *ddr2_reg_base;
+static bool ddr2_pdown;
+
+static void davinci_save_ddr_power(int enter, bool pdown)
+{
+	u32 val;
+
+	val = __raw_readl(ddr2_reg_base + DDR2_SDRCR_OFFSET);
+
+	if (enter) {
+		if (pdown)
+			val |= DDR2_SRPD_BIT;
+		else
+			val &= ~DDR2_SRPD_BIT;
+		val |= DDR2_LPMODEN_BIT;
+	} else {
+		val &= ~(DDR2_SRPD_BIT | DDR2_LPMODEN_BIT);
+	}
+
+	__raw_writel(val, ddr2_reg_base + DDR2_SDRCR_OFFSET);
+}
 
 /* Actual code that puts the SoC in different idle states */
 static int davinci_enter_idle(struct cpuidle_device *dev,
 				struct cpuidle_driver *drv,
 						int index)
 {
-	struct cpuidle_state_usage *state_usage = &dev->states_usage[index];
-	struct davinci_ops *ops = cpuidle_get_statedata(state_usage);
-
-	if (ops && ops->enter)
-		ops->enter(ops->flags);
+	davinci_save_ddr_power(1, ddr2_pdown);
 
 	index = cpuidle_wrap_enter(dev,	drv, index,
 				arm_cpuidle_simple_enter);
 
-	if (ops && ops->exit)
-		ops->exit(ops->flags);
+	davinci_save_ddr_power(0, ddr2_pdown);
 
 	return index;
 }
 
-/* fields in davinci_ops.flags */
-#define DAVINCI_CPUIDLE_FLAGS_DDR2_PWDN	BIT(0)
-
 static struct cpuidle_driver davinci_idle_driver = {
 	.name			= "cpuidle-davinci",
 	.owner			= THIS_MODULE,
@@ -70,45 +79,6 @@ static struct cpuidle_driver davinci_idle_driver = {
 	.state_count = DAVINCI_CPUIDLE_MAX_STATES,
 };
 
-static DEFINE_PER_CPU(struct cpuidle_device, davinci_cpuidle_device);
-static void __iomem *ddr2_reg_base;
-
-static void davinci_save_ddr_power(int enter, bool pdown)
-{
-	u32 val;
-
-	val = __raw_readl(ddr2_reg_base + DDR2_SDRCR_OFFSET);
-
-	if (enter) {
-		if (pdown)
-			val |= DDR2_SRPD_BIT;
-		else
-			val &= ~DDR2_SRPD_BIT;
-		val |= DDR2_LPMODEN_BIT;
-	} else {
-		val &= ~(DDR2_SRPD_BIT | DDR2_LPMODEN_BIT);
-	}
-
-	__raw_writel(val, ddr2_reg_base + DDR2_SDRCR_OFFSET);
-}
-
-static void davinci_c2state_enter(u32 flags)
-{
-	davinci_save_ddr_power(1, !!(flags & DAVINCI_CPUIDLE_FLAGS_DDR2_PWDN));
-}
-
-static void davinci_c2state_exit(u32 flags)
-{
-	davinci_save_ddr_power(0, !!(flags & DAVINCI_CPUIDLE_FLAGS_DDR2_PWDN));
-}
-
-static struct davinci_ops davinci_states[DAVINCI_CPUIDLE_MAX_STATES] = {
-	[1] = {
-		.enter	= davinci_c2state_enter,
-		.exit	= davinci_c2state_exit,
-	},
-};
-
 static int __init davinci_cpuidle_probe(struct platform_device *pdev)
 {
 	int ret;
@@ -124,11 +94,7 @@ static int __init davinci_cpuidle_probe(struct platform_device *pdev)
 
 	ddr2_reg_base = pdata->ddr2_ctlr_base;
 
-	if (pdata->ddr2_pdown)
-		davinci_states[1].flags |= DAVINCI_CPUIDLE_FLAGS_DDR2_PWDN;
-	cpuidle_set_statedata(&device->states_usage[1], &davinci_states[1]);
-
-	device->state_count = DAVINCI_CPUIDLE_MAX_STATES;
+	ddr2_pdown = pdata->ddr2_pdown;
 
 	ret = cpuidle_register_driver(&davinci_idle_driver);
 	if (ret) {
diff --git a/arch/arm64/kernel/process.c b/arch/arm64/kernel/process.c
index cb0956bc96e..c7002d40a9b 100644
--- a/arch/arm64/kernel/process.c
+++ b/arch/arm64/kernel/process.c
@@ -97,14 +97,9 @@ static void default_idle(void)
 	local_irq_enable();
 }
 
-void (*pm_idle)(void) = default_idle;
-EXPORT_SYMBOL_GPL(pm_idle);
-
 /*
- * The idle thread, has rather strange semantics for calling pm_idle,
- * but this is what x86 does and we need to do the same, so that
- * things like cpuidle get called in the same way.  The only difference
- * is that we always respect 'hlt_counter' to prevent low power idle.
+ * The idle thread.
+ * We always respect 'hlt_counter' to prevent low power idle.
  */
 void cpu_idle(void)
 {
@@ -122,10 +117,10 @@ void cpu_idle(void)
 			local_irq_disable();
 			if (!need_resched()) {
 				stop_critical_timings();
-				pm_idle();
+				default_idle();
 				start_critical_timings();
 				/*
-				 * pm_idle functions should always return
+				 * default_idle functions should always return
 				 * with IRQs enabled.
 				 */
 				WARN_ON(irqs_disabled());
diff --git a/arch/blackfin/kernel/process.c b/arch/blackfin/kernel/process.c
index 3e16ad9b0a9..8061426b7df 100644
--- a/arch/blackfin/kernel/process.c
+++ b/arch/blackfin/kernel/process.c
@@ -39,12 +39,6 @@ int nr_l1stack_tasks;
 void *l1_stack_base;
 unsigned long l1_stack_len;
 
-/*
- * Powermanagement idle function, if any..
- */
-void (*pm_idle)(void) = NULL;
-EXPORT_SYMBOL(pm_idle);
-
 void (*pm_power_off)(void) = NULL;
 EXPORT_SYMBOL(pm_power_off);
 
@@ -81,7 +75,6 @@ void cpu_idle(void)
 {
 	/* endless idle loop with no priority at all */
 	while (1) {
-		void (*idle)(void) = pm_idle;
 
 #ifdef CONFIG_HOTPLUG_CPU
 		if (cpu_is_offline(smp_processor_id()))
diff --git a/arch/cris/kernel/process.c b/arch/cris/kernel/process.c
index 7f65be6f7f1..104ff4dd9b9 100644
--- a/arch/cris/kernel/process.c
+++ b/arch/cris/kernel/process.c
@@ -54,11 +54,6 @@ void enable_hlt(void)
 
 EXPORT_SYMBOL(enable_hlt);
  
-/*
- * The following aren't currently used.
- */
-void (*pm_idle)(void);
-
 extern void default_idle(void);
 
 void (*pm_power_off)(void);
@@ -77,16 +72,12 @@ void cpu_idle (void)
 	while (1) {
 		rcu_idle_enter();
 		while (!need_resched()) {
-			void (*idle)(void);
 			/*
 			 * Mark this as an RCU critical section so that
 			 * synchronize_kernel() in the unload path waits
 			 * for our completion.
 			 */
-			idle = pm_idle;
-			if (!idle)
-				idle = default_idle;
-			idle();
+			default_idle();
 		}
 		rcu_idle_exit();
 		schedule_preempt_disabled();
diff --git a/arch/ia64/kernel/process.c b/arch/ia64/kernel/process.c
index 31360cbbd5f..e34f565f595 100644
--- a/arch/ia64/kernel/process.c
+++ b/arch/ia64/kernel/process.c
@@ -57,8 +57,6 @@ void (*ia64_mark_idle)(int);
 
 unsigned long boot_option_idle_override = IDLE_NO_OVERRIDE;
 EXPORT_SYMBOL(boot_option_idle_override);
-void (*pm_idle) (void);
-EXPORT_SYMBOL(pm_idle);
 void (*pm_power_off) (void);
 EXPORT_SYMBOL(pm_power_off);
 
@@ -301,7 +299,6 @@ cpu_idle (void)
 			if (mark_idle)
 				(*mark_idle)(1);
 
-			idle = pm_idle;
 			if (!idle)
 				idle = default_idle;
 			(*idle)();
diff --git a/arch/ia64/kernel/setup.c b/arch/ia64/kernel/setup.c
index aaefd9b94f2..2029cc0d2fc 100644
--- a/arch/ia64/kernel/setup.c
+++ b/arch/ia64/kernel/setup.c
@@ -1051,7 +1051,6 @@ cpu_init (void)
 		max_num_phys_stacked = num_phys_stacked;
 	}
 	platform_cpu_init();
-	pm_idle = default_idle;
 }
 
 void __init
diff --git a/arch/m32r/kernel/process.c b/arch/m32r/kernel/process.c
index 765d0f57c78..bde899e155d 100644
--- a/arch/m32r/kernel/process.c
+++ b/arch/m32r/kernel/process.c
@@ -44,36 +44,10 @@ unsigned long thread_saved_pc(struct task_struct *tsk)
 	return tsk->thread.lr;
 }
 
-/*
- * Powermanagement idle function, if any..
- */
-static void (*pm_idle)(void) = NULL;
-
 void (*pm_power_off)(void) = NULL;
 EXPORT_SYMBOL(pm_power_off);
 
 /*
- * We use this is we don't have any better
- * idle routine..
- */
-static void default_idle(void)
-{
-	/* M32R_FIXME: Please use "cpu_sleep" mode.  */
-	cpu_relax();
-}
-
-/*
- * On SMP it's slightly faster (but much more power-consuming!)
- * to poll the ->work.need_resched flag instead of waiting for the
- * cross-CPU IPI to arrive. Use this option with caution.
- */
-static void poll_idle (void)
-{
-	/* M32R_FIXME */
-	cpu_relax();
-}
-
-/*
  * The idle thread. There's no useful work to be
  * done, so just try to conserve power and have a
  * low exit latency (ie sit in a loop waiting for
@@ -84,14 +58,8 @@ void cpu_idle (void)
 	/* endless idle loop with no priority at all */
 	while (1) {
 		rcu_idle_enter();
-		while (!need_resched()) {
-			void (*idle)(void) = pm_idle;
-
-			if (!idle)
-				idle = default_idle;
-
-			idle();
-		}
+		while (!need_resched())
+			cpu_relax();
 		rcu_idle_exit();
 		schedule_preempt_disabled();
 	}
@@ -120,21 +88,6 @@ void machine_power_off(void)
 	/* M32R_FIXME */
 }
 
-static int __init idle_setup (char *str)
-{
-	if (!strncmp(str, "poll", 4)) {
-		printk("using poll in idle threads.\n");
-		pm_idle = poll_idle;
-	} else if (!strncmp(str, "sleep", 4)) {
-		printk("using sleep in idle threads.\n");
-		pm_idle = default_idle;
-	}
-
-	return 1;
-}
-
-__setup("idle=", idle_setup);
-
 void show_regs(struct pt_regs * regs)
 {
 	printk("\n");
diff --git a/arch/microblaze/kernel/process.c b/arch/microblaze/kernel/process.c
index a5b74f729e5..6ff2dcff341 100644
--- a/arch/microblaze/kernel/process.c
+++ b/arch/microblaze/kernel/process.c
@@ -41,7 +41,6 @@ void show_regs(struct pt_regs *regs)
 				regs->msr, regs->ear, regs->esr, regs->fsr);
 }
 
-void (*pm_idle)(void);
 void (*pm_power_off)(void) = NULL;
 EXPORT_SYMBOL(pm_power_off);
 
@@ -98,8 +97,6 @@ void cpu_idle(void)
 
 	/* endless idle loop with no priority at all */
 	while (1) {
-		void (*idle)(void) = pm_idle;
-
 		if (!idle)
 			idle = default_idle;
 
diff --git a/arch/mn10300/kernel/process.c b/arch/mn10300/kernel/process.c
index eb09f5a552f..84f4e97e307 100644
--- a/arch/mn10300/kernel/process.c
+++ b/arch/mn10300/kernel/process.c
@@ -37,12 +37,6 @@
 #include "internal.h"
 
 /*
- * power management idle function, if any..
- */
-void (*pm_idle)(void);
-EXPORT_SYMBOL(pm_idle);
-
-/*
  * return saved PC of a blocked thread.
  */
 unsigned long thread_saved_pc(struct task_struct *tsk)
@@ -113,7 +107,6 @@ void cpu_idle(void)
 			void (*idle)(void);
 
 			smp_rmb();
-			idle = pm_idle;
 			if (!idle) {
 #if defined(CONFIG_SMP) && !defined(CONFIG_HOTPLUG_CPU)
 				idle = poll_idle;
diff --git a/arch/openrisc/kernel/idle.c b/arch/openrisc/kernel/idle.c
index 7d618feb1b7..5e8a3b6d6bc 100644
--- a/arch/openrisc/kernel/idle.c
+++ b/arch/openrisc/kernel/idle.c
@@ -39,11 +39,6 @@
 
 void (*powersave) (void) = NULL;
 
-static inline void pm_idle(void)
-{
-	barrier();
-}
-
 void cpu_idle(void)
 {
 	set_thread_flag(TIF_POLLING_NRFLAG);
diff --git a/arch/sh/kernel/idle.c b/arch/sh/kernel/idle.c
index 0c910163caa..3d5a1b387cc 100644
--- a/arch/sh/kernel/idle.c
+++ b/arch/sh/kernel/idle.c
@@ -22,7 +22,7 @@
 #include <asm/smp.h>
 #include <asm/bl_bit.h>
 
-void (*pm_idle)(void);
+static void (*sh_idle)(void);
 
 static int hlt_counter;
 
@@ -103,9 +103,9 @@ void cpu_idle(void)
 			/* Don't trace irqs off for idle */
 			stop_critical_timings();
 			if (cpuidle_idle_call())
-				pm_idle();
+				sh_idle();
 			/*
-			 * Sanity check to ensure that pm_idle() returns
+			 * Sanity check to ensure that sh_idle() returns
 			 * with IRQs enabled
 			 */
 			WARN_ON(irqs_disabled());
@@ -123,13 +123,13 @@ void __init select_idle_routine(void)
 	/*
 	 * If a platform has set its own idle routine, leave it alone.
 	 */
-	if (pm_idle)
+	if (sh_idle)
 		return;
 
 	if (hlt_works())
-		pm_idle = default_idle;
+		sh_idle = default_idle;
 	else
-		pm_idle = poll_idle;
+		sh_idle = poll_idle;
 }
 
 void stop_this_cpu(void *unused)
diff --git a/arch/sparc/include/asm/processor_32.h b/arch/sparc/include/asm/processor_32.h
index c1e01914fd9..2c7baa4c450 100644
--- a/arch/sparc/include/asm/processor_32.h
+++ b/arch/sparc/include/asm/processor_32.h
@@ -118,6 +118,7 @@ extern unsigned long get_wchan(struct task_struct *);
 extern struct task_struct *last_task_used_math;
 
 #define cpu_relax()	barrier()
+extern void (*sparc_idle)(void);
 
 #endif
 
diff --git a/arch/sparc/kernel/apc.c b/arch/sparc/kernel/apc.c
index 348fa1aeabc..eefda32b595 100644
--- a/arch/sparc/kernel/apc.c
+++ b/arch/sparc/kernel/apc.c
@@ -20,6 +20,7 @@
 #include <asm/uaccess.h>
 #include <asm/auxio.h>
 #include <asm/apc.h>
+#include <asm/processor.h>
 
 /* Debugging
  * 
@@ -158,7 +159,7 @@ static int apc_probe(struct platform_device *op)
 
 	/* Assign power management IDLE handler */
 	if (!apc_no_idle)
-		pm_idle = apc_swift_idle;	
+		sparc_idle = apc_swift_idle;
 
 	printk(KERN_INFO "%s: power management initialized%s\n", 
 	       APC_DEVNAME, apc_no_idle ? " (CPU idle disabled)" : "");
diff --git a/arch/sparc/kernel/leon_pmc.c b/arch/sparc/kernel/leon_pmc.c
index 4e174321097..708bca43521 100644
--- a/arch/sparc/kernel/leon_pmc.c
+++ b/arch/sparc/kernel/leon_pmc.c
@@ -9,6 +9,7 @@
 #include <asm/leon_amba.h>
 #include <asm/cpu_type.h>
 #include <asm/leon.h>
+#include <asm/processor.h>
 
 /* List of Systems that need fixup instructions around power-down instruction */
 unsigned int pmc_leon_fixup_ids[] = {
@@ -69,9 +70,9 @@ static int __init leon_pmc_install(void)
 	if (sparc_cpu_model == sparc_leon) {
 		/* Assign power management IDLE handler */
 		if (pmc_leon_need_fixup())
-			pm_idle = pmc_leon_idle_fixup;
+			sparc_idle = pmc_leon_idle_fixup;
 		else
-			pm_idle = pmc_leon_idle;
+			sparc_idle = pmc_leon_idle;
 
 		printk(KERN_INFO "leon: power management initialized\n");
 	}
diff --git a/arch/sparc/kernel/pmc.c b/arch/sparc/kernel/pmc.c
index dcbb62f6306..8b7297faca7 100644
--- a/arch/sparc/kernel/pmc.c
+++ b/arch/sparc/kernel/pmc.c
@@ -17,6 +17,7 @@
 #include <asm/oplib.h>
 #include <asm/uaccess.h>
 #include <asm/auxio.h>
+#include <asm/processor.h>
 
 /* Debug
  *
@@ -63,7 +64,7 @@ static int pmc_probe(struct platform_device *op)
 
 #ifndef PMC_NO_IDLE
 	/* Assign power management IDLE handler */
-	pm_idle = pmc_swift_idle;
+	sparc_idle = pmc_swift_idle;
 #endif
 
 	printk(KERN_INFO "%s: power management initialized\n", PMC_DEVNAME);
diff --git a/arch/sparc/kernel/process_32.c b/arch/sparc/kernel/process_32.c
index be8e862bada..62eede13831 100644
--- a/arch/sparc/kernel/process_32.c
+++ b/arch/sparc/kernel/process_32.c
@@ -43,8 +43,7 @@
  * Power management idle function 
  * Set in pm platform drivers (apc.c and pmc.c)
  */
-void (*pm_idle)(void);
-EXPORT_SYMBOL(pm_idle);
+void (*sparc_idle)(void);
 
 /* 
  * Power-off handler instantiation for pm.h compliance
@@ -75,8 +74,8 @@ void cpu_idle(void)
 	/* endless idle loop with no priority at all */
 	for (;;) {
 		while (!need_resched()) {
-			if (pm_idle)
-				(*pm_idle)();
+			if (sparc_idle)
+				(*sparc_idle)();
 			else
 				cpu_relax();
 		}
diff --git a/arch/unicore32/kernel/process.c b/arch/unicore32/kernel/process.c
index 62bad9fed03..872d7e22d84 100644
--- a/arch/unicore32/kernel/process.c
+++ b/arch/unicore32/kernel/process.c
@@ -45,11 +45,6 @@ static const char * const processor_modes[] = {
 	"UK18", "UK19", "UK1A", "EXTN", "UK1C", "UK1D", "UK1E", "SUSR"
 };
 
-/*
- * The idle thread, has rather strange semantics for calling pm_idle,
- * but this is what x86 does and we need to do the same, so that
- * things like cpuidle get called in the same way.
- */
 void cpu_idle(void)
 {
 	/* endless idle loop with no priority at all */
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 4f7c2da2f9f..c03309f697f 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -1922,6 +1922,7 @@ config APM_DO_ENABLE
 	  this feature.
 
 config APM_CPU_IDLE
+	depends on CPU_IDLE
 	bool "Make CPU Idle calls when idle"
 	---help---
 	  Enable calls to APM CPU Idle/CPU Busy inside the kernel's idle loop.
diff --git a/arch/x86/include/asm/mwait.h b/arch/x86/include/asm/mwait.h
index bcdff997668..2f366d0ac6b 100644
--- a/arch/x86/include/asm/mwait.h
+++ b/arch/x86/include/asm/mwait.h
@@ -4,7 +4,8 @@
 #define MWAIT_SUBSTATE_MASK		0xf
 #define MWAIT_CSTATE_MASK		0xf
 #define MWAIT_SUBSTATE_SIZE		4
-#define MWAIT_MAX_NUM_CSTATES		8
+#define MWAIT_HINT2CSTATE(hint)		(((hint) >> MWAIT_SUBSTATE_SIZE) & MWAIT_CSTATE_MASK)
+#define MWAIT_HINT2SUBSTATE(hint)	((hint) & MWAIT_CSTATE_MASK)
 
 #define CPUID_MWAIT_LEAF		5
 #define CPUID5_ECX_EXTENSIONS_SUPPORTED 0x1
diff --git a/arch/x86/include/asm/processor.h b/arch/x86/include/asm/processor.h
index 888184b2fc8..b9e7d279f8e 100644
--- a/arch/x86/include/asm/processor.h
+++ b/arch/x86/include/asm/processor.h
@@ -89,7 +89,6 @@ struct cpuinfo_x86 {
 	char			wp_works_ok;	/* It doesn't on 386's */
 
 	/* Problems on some 486Dx4's and old 386's: */
-	char			hlt_works_ok;
 	char			hard_math;
 	char			rfu;
 	char			fdiv_bug;
@@ -165,15 +164,6 @@ DECLARE_PER_CPU_SHARED_ALIGNED(struct cpuinfo_x86, cpu_info);
 
 extern const struct seq_operations cpuinfo_op;
 
-static inline int hlt_works(int cpu)
-{
-#ifdef CONFIG_X86_32
-	return cpu_data(cpu).hlt_works_ok;
-#else
-	return 1;
-#endif
-}
-
 #define cache_line_size()	(boot_cpu_data.x86_cache_alignment)
 
 extern void cpu_detect(struct cpuinfo_x86 *c);
@@ -725,7 +715,7 @@ extern unsigned long		boot_option_idle_override;
 extern bool			amd_e400_c1e_detected;
 
 enum idle_boot_override {IDLE_NO_OVERRIDE=0, IDLE_HALT, IDLE_NOMWAIT,
-			 IDLE_POLL, IDLE_FORCE_MWAIT};
+			 IDLE_POLL};
 
 extern void enable_sep_cpu(void);
 extern int sysenter_setup(void);
@@ -998,7 +988,11 @@ extern unsigned long arch_align_stack(unsigned long sp);
 extern void free_init_pages(char *what, unsigned long begin, unsigned long end);
 
 void default_idle(void);
-bool set_pm_idle_to_default(void);
+#ifdef	CONFIG_XEN
+bool xen_set_default_idle(void);
+#else
+#define xen_set_default_idle 0
+#endif
 
 void stop_this_cpu(void *dummy);
 
diff --git a/arch/x86/include/uapi/asm/msr-index.h b/arch/x86/include/uapi/asm/msr-index.h
index 433a59fb1a7..8d013f5153b 100644
--- a/arch/x86/include/uapi/asm/msr-index.h
+++ b/arch/x86/include/uapi/asm/msr-index.h
@@ -103,6 +103,8 @@
 #define DEBUGCTLMSR_BTS_OFF_USR		(1UL << 10)
 #define DEBUGCTLMSR_FREEZE_LBRS_ON_PMI	(1UL << 11)
 
+#define MSR_IA32_POWER_CTL		0x000001fc
+
 #define MSR_IA32_MC0_CTL		0x00000400
 #define MSR_IA32_MC0_STATUS		0x00000401
 #define MSR_IA32_MC0_ADDR		0x00000402
@@ -272,6 +274,7 @@
 #define MSR_IA32_PLATFORM_ID		0x00000017
 #define MSR_IA32_EBL_CR_POWERON		0x0000002a
 #define MSR_EBC_FREQUENCY_ID		0x0000002c
+#define MSR_SMI_COUNT			0x00000034
 #define MSR_IA32_FEATURE_CONTROL        0x0000003a
 #define MSR_IA32_TSC_ADJUST             0x0000003b
 
diff --git a/arch/x86/kernel/apm_32.c b/arch/x86/kernel/apm_32.c
index d65464e4350..9f4bc6a1164 100644
--- a/arch/x86/kernel/apm_32.c
+++ b/arch/x86/kernel/apm_32.c
@@ -232,6 +232,7 @@
 #include <linux/acpi.h>
 #include <linux/syscore_ops.h>
 #include <linux/i8253.h>
+#include <linux/cpuidle.h>
 
 #include <asm/uaccess.h>
 #include <asm/desc.h>
@@ -360,13 +361,35 @@ struct apm_user {
  * idle percentage above which bios idle calls are done
  */
 #ifdef CONFIG_APM_CPU_IDLE
-#warning deprecated CONFIG_APM_CPU_IDLE will be deleted in 2012
 #define DEFAULT_IDLE_THRESHOLD	95
 #else
 #define DEFAULT_IDLE_THRESHOLD	100
 #endif
 #define DEFAULT_IDLE_PERIOD	(100 / 3)
 
+static int apm_cpu_idle(struct cpuidle_device *dev,
+			struct cpuidle_driver *drv, int index);
+
+static struct cpuidle_driver apm_idle_driver = {
+	.name = "apm_idle",
+	.owner = THIS_MODULE,
+	.en_core_tk_irqen = 1,
+	.states = {
+		{ /* entry 0 is for polling */ },
+		{ /* entry 1 is for APM idle */
+			.name = "APM",
+			.desc = "APM idle",
+			.flags = CPUIDLE_FLAG_TIME_VALID,
+			.exit_latency = 250,	/* WAG */
+			.target_residency = 500,	/* WAG */
+			.enter = &apm_cpu_idle
+		},
+	},
+	.state_count = 2,
+};
+
+static struct cpuidle_device apm_cpuidle_device;
+
 /*
  * Local variables
  */
@@ -377,7 +400,6 @@ static struct {
 static int clock_slowed;
 static int idle_threshold __read_mostly = DEFAULT_IDLE_THRESHOLD;
 static int idle_period __read_mostly = DEFAULT_IDLE_PERIOD;
-static int set_pm_idle;
 static int sus