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)

28 files changed, 118 insertions, 350 deletions

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 suspends_pending;
 static int standbys_pending;
 static int ignore_sys_suspend;
@@ -884,8 +906,6 @@ static void apm_do_busy(void)
 #define IDLE_CALC_LIMIT	(HZ * 100)
 #define IDLE_LEAKY_MAX	16
 
-static void (*original_pm_idle)(void) __read_mostly;
-
 /**
  * apm_cpu_idle		-	cpu idling for APM capable Linux
  *
@@ -894,7 +914,8 @@ static void (*original_pm_idle)(void) __read_mostly;
  * Furthermore it calls the system default idle routine.
  */
 
-static void apm_cpu_idle(void)
+static int apm_cpu_idle(struct cpuidle_device *dev,
+	struct cpuidle_driver *drv, int index)
 {
 	static int use_apm_idle; /* = 0 */
 	static unsigned int last_jiffies; /* = 0 */
@@ -904,7 +925,6 @@ static void apm_cpu_idle(void)
 	unsigned int jiffies_since_last_check = jiffies - last_jiffies;
 	unsigned int bucket;
 
-	WARN_ONCE(1, "deprecated apm_cpu_idle will be deleted in 2012");
 recalc:
 	if (jiffies_since_last_check > IDLE_CALC_LIMIT) {
 		use_apm_idle = 0;
@@ -950,10 +970,7 @@ recalc:
 				break;
 			}
 		}
-		if (original_pm_idle)
-			original_pm_idle();
-		else
-			default_idle();
+		default_idle();
 		local_irq_disable();
 		jiffies_since_last_check = jiffies - last_jiffies;
 		if (jiffies_since_last_check > idle_period)
@@ -963,7 +980,7 @@ recalc:
 	if (apm_idle_done)
 		apm_do_busy();
 
-	local_irq_enable();
+	return index;
 }
 
 /**
@@ -2381,9 +2398,9 @@ static int __init apm_init(void)
 	if (HZ != 100)
 		idle_period = (idle_period * HZ) / 100;
 	if (idle_threshold < 100) {
-		original_pm_idle = pm_idle;
-		pm_idle  = apm_cpu_idle;
-		set_pm_idle = 1;
+		if (!cpuidle_register_driver(&apm_idle_driver))
+			if (cpuidle_register_device(&apm_cpuidle_device))
+				cpuidle_unregister_driver(&apm_idle_driver);
 	}
 
 	return 0;
@@ -2393,15 +2410,9 @@ static void __exit apm_exit(void)
 {
 	int error;
 
-	if (set_pm_idle) {
-		pm_idle = original_pm_idle;
-		/*
-		 * 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.
-		 */
-		kick_all_cpus_sync();
-	}
+	cpuidle_unregister_device(&apm_cpuidle_device);
+	cpuidle_unregister_driver(&apm_idle_driver);
+
 	if (((apm_info.bios.flags & APM_BIOS_DISENGAGED) == 0)
 	    && (apm_info.connection_version > 0x0100)) {
 		error = apm_engage_power_management(APM_DEVICE_ALL, 0);
diff --git a/arch/x86/kernel/cpu/bugs.c b/arch/x86/kernel/cpu/bugs.c
index 92dfec986a4..af6455e3fcc 100644
--- a/arch/x86/kernel/cpu/bugs.c
+++ b/arch/x86/kernel/cpu/bugs.c
@@ -17,15 +17,6 @@
 #include <asm/paravirt.h>
 #include <asm/alternative.h>
 
-static int __init no_halt(char *s)
-{
-	WARN_ONCE(1, "\"no-hlt\" is deprecated, please use \"idle=poll\"\n");
-	boot_cpu_data.hlt_works_ok = 0;
-	return 1;
-}
-
-__setup("no-hlt", no_halt);
-
 static int __init no_387(char *s)
 {
 	boot_cpu_data.hard_math = 0;
@@ -89,23 +80,6 @@ static void __init check_fpu(void)
 		pr_warn("Hmm, FPU with FDIV bug\n");
 }
 
-static void __init check_hlt(void)
-{
-	if (boot_cpu_data.x86 >= 5 || paravirt_enabled())
-		return;
-
-	pr_info("Checking 'hlt' instruction... ");
-	if (!boot_cpu_data.hlt_works_ok) {
-		pr_cont("disabled\n");
-		return;
-	}
-	halt();
-	halt();
-	halt();
-	halt();
-	pr_cont("OK\n");
-}
-
 /*
  * Check whether we are able to run this kernel safely on SMP.
  *
@@ -129,7 +103,6 @@ void __init check_bugs(void)
 	print_cpu_info(&boot_cpu_data);
 #endif
 	check_config();
-	check_hlt();
 	init_utsname()->machine[1] =
 		'0' + (boot_cpu_data.x86 > 6 ? 6 : boot_cpu_data.x86);
 	alternative_instructions();
diff --git a/arch/x86/kernel/cpu/proc.c b/arch/x86/kernel/cpu/proc.c
index 3286a92e662..e280253f6f9 100644
--- a/arch/x86/kernel/cpu/proc.c
+++ b/arch/x86/kernel/cpu/proc.c
@@ -28,7 +28,6 @@ static void show_cpuinfo_misc(struct seq_file *m, struct cpuinfo_x86 *c)
 {
 	seq_printf(m,
 		   "fdiv_bug\t: %s\n"
-		   "hlt_bug\t\t: %s\n"
 		   "f00f_bug\t: %s\n"
 		   "coma_bug\t: %s\n"
 		   "fpu\t\t: %s\n"
@@ -36,7 +35,6 @@ static void show_cpuinfo_misc(struct seq_file *m, struct cpuinfo_x86 *c)
 		   "cpuid level\t: %d\n"
 		   "wp\t\t: %s\n",
 		   c->fdiv_bug ? "yes" : "no",
-		   c->hlt_works_ok ? "no" : "yes",
 		   c->f00f_bug ? "yes" : "no",
 		   c->coma_bug ? "yes" : "no",
 		   c->hard_math ? "yes" : "no",
diff --git a/arch/x86/kernel/process.c b/arch/x86/kernel/process.c
index dcfc1f410dc..14ae10031ff 100644
--- a/arch/x86/kernel/process.c
+++ b/arch/x86/kernel/process.c
@@ -268,13 +268,7 @@ void __switch_to_xtra(struct task_struct *prev_p, struct task_struct *next_p,
 unsigned long boot_option_idle_override = IDLE_NO_OVERRIDE;
 EXPORT_SYMBOL(boot_option_idle_override);
 
-/*
- * Powermanagement idle function, if any..
- */
-void (*pm_idle)(void);
-#ifdef CONFIG_APM_MODULE
-EXPORT_SYMBOL(pm_idle);
-#endif
+static void (*x86_idle)(void);
 
 #ifndef CONFIG_SMP
 static inline void play_dead(void)
@@ -351,7 +345,7 @@ void cpu_idle(void)
 			rcu_idle_enter();
 
 			if (cpuidle_idle_call())
-				pm_idle();
+				x86_idle();
 
 			rcu_idle_exit();
 			start_critical_timings();
@@ -394,14 +388,16 @@ void default_idle(void)
 EXPORT_SYMBOL(default_idle);
 #endif
 
-bool set_pm_idle_to_default(void)
+#ifdef CONFIG_XEN
+bool xen_set_default_idle(void)
 {
-	bool ret = !!pm_idle;
+	bool ret = !!x86_idle;
 
-	pm_idle = default_idle;
+	x86_idle = default_idle;
 
 	return ret;
 }
+#endif
 void stop_this_cpu(void *dummy)
 {
 	local_irq_disable();
@@ -411,29 +407,8 @@ void stop_this_cpu(void *dummy)
 	set_cpu_online(smp_processor_id(), false);
 	disable_local_APIC();
 
-	for (;;) {
-		if (hlt_works(smp_processor_id()))
-			halt();
-	}
-}
-
-/* Default MONITOR/MWAIT with no hints, used for default C1 state */
-static void mwait_idle(void)
-{
-	if (!need_resched()) {
-		trace_cpu_idle_rcuidle(1, smp_processor_id());
-		if (this_cpu_has(X86_FEATURE_CLFLUSH_MONITOR))
-			clflush((void *)&current_thread_info()->flags);
-
-		__monitor((void *)&current_thread_info()->flags, 0, 0);
-		smp_mb();
-		if (!need_resched())
-			__sti_mwait(0, 0);
-		else
-			local_irq_enable();
-		trace_cpu_idle_rcuidle(PWR_EVENT_EXIT, smp_processor_id());
-	} else
-		local_irq_enable();
+	for (;;)
+		halt();
 }
 
 /*
@@ -450,53 +425,6 @@ static void poll_idle(void)
 	trace_cpu_idle_rcuidle(PWR_EVENT_EXIT, smp_processor_id());
 }
 
-/*
- * mwait selection logic:
- *
- * It depends on the CPU. For AMD CPUs that support MWAIT this is
- * wrong. Family 0x10 and 0x11 CPUs will enter C1 on HLT. Powersavings
- * then depend on a clock divisor and current Pstate of the core. If
- * all cores of a processor are in halt state (C1) the processor can
- * enter the C1E (C1 enhanced) state. If mwait is used this will never
- * happen.
- *
- * idle=mwait overrides this decision and forces the usage of mwait.
- */
-
-#define MWAIT_INFO			0x05
-#define MWAIT_ECX_EXTENDED_INFO		0x01
-#define MWAIT_EDX_C1			0xf0
-
-int mwait_usable(const struct cpuinfo_x86 *c)
-{
-	u32 eax, ebx, ecx, edx;
-
-	/* Use mwait if idle=mwait boot option is given */
-	if (boot_option_idle_override == IDLE_FORCE_MWAIT)
-		return 1;
-
-	/*
-	 * Any idle= boot option other than idle=mwait means that we must not
-	 * use mwait. Eg: idle=halt or idle=poll or idle=nomwait
-	 */
-	if (boot_option_idle_override != IDLE_NO_OVERRIDE)
-		return 0;
-
-	if (c->cpuid_level < MWAIT_INFO)
-		return 0;
-
-	cpuid(MWAIT_INFO, &eax, &ebx, &ecx, &edx);
-	/* Check, whether EDX has extended info about MWAIT */
-	if (!(ecx & MWAIT_ECX_EXTENDED_INFO))
-		return 1;
-
-	/*
-	 * edx enumeratios MONITOR/MWAIT extensions. Check, whether
-	 * C1  supports MWAIT
-	 */
-	return (edx & MWAIT_EDX_C1);
-}
-
 bool amd_e400_c1e_detected;
 EXPORT_SYMBOL(amd_e400_c1e_detected);
 
@@ -561,31 +489,24 @@ static void amd_e400_idle(void)
 void __cpuinit select_idle_routine(const struct cpuinfo_x86 *c)
 {
 #ifdef CONFIG_SMP
-	if (pm_idle == poll_idle && smp_num_siblings > 1) {
+	if (x86_idle == poll_idle && smp_num_siblings > 1)
 		pr_warn_once("WARNING: polling idle and HT enabled, performance may degrade\n");
-	}
 #endif
-	if (pm_idle)
+	if (x86_idle)
 		return;
 
-	if (cpu_has(c, X86_FEATURE_MWAIT) && mwait_usable(c)) {
-		/*
-		 * One CPU supports mwait => All CPUs supports mwait
-		 */
-		pr_info("using mwait in idle threads\n");
-		pm_idle = mwait_idle;
-	} else if (cpu_has_amd_erratum(amd_erratum_400)) {
+	if (cpu_has_amd_erratum(amd_erratum_400)) {
 		/* E400: APIC timer interrupt does not wake up CPU from C1e */
 		pr_info("using AMD E400 aware idle routine\n");
-		pm_idle = amd_e400_idle;
+		x86_idle = amd_e400_idle;
 	} else
-		pm_idle = default_idle;
+		x86_idle = default_idle;
 }
 
 void __init init_amd_e400_c1e_mask(void)
 {
 	/* If we're using amd_e400_idle, we need to allocate amd_e400_c1e_mask. */
-	if (pm_idle == amd_e400_idle)
+	if (x86_idle == amd_e400_idle)
 		zalloc_cpumask_var(&amd_e400_c1e_mask, GFP_KERNEL);
 }
 
@@ -596,11 +517,8 @@ static int __init idle_setup(char *str)
 
 	if (!strcmp(str, "poll")) {
 		pr_info("using polling idle threads\n");
-		pm_idle = poll_idle;
+		x86_idle = poll_idle;
 		boot_option_idle_override = IDLE_POLL;
-	} else if (!strcmp(str, "mwait")) {
-		boot_option_idle_override = IDLE_FORCE_MWAIT;
-		WARN_ONCE(1, "\"idle=mwait\" will be removed in 2012\n");
 	} else if (!strcmp(str, "halt")) {
 		/*
 		 * When the boot option of idle=halt is added, halt is
@@ -609,7 +527,7 @@ static int __init idle_setup(char *str)
 		 * To continue to load the CPU idle driver, don't touch
 		 * the boot_option_idle_override.
 		 */
-		pm_idle = default_idle;
+		x86_idle = default_idle;
 		boot_option_idle_override = IDLE_HALT;
 	} else if (!strcmp(str, "nomwait")) {
 		/*
diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c
index ed0fe385289..a6ceaedc396 100644
--- a/arch/x86/kernel/smpboot.c
+++ b/arch/x86/kernel/smpboot.c
@@ -1369,7 +1369,7 @@ static inline void mwait_play_dead(void)
 	void *mwait_ptr;
 	struct cpuinfo_x86 *c = __this_cpu_ptr(&cpu_info);
 
-	if (!(this_cpu_has(X86_FEATURE_MWAIT) && mwait_usable(c)))
+	if (!this_cpu_has(X86_FEATURE_MWAIT))
 		return;
 	if (!this_cpu_has(X86_FEATURE_CLFLSH))
 		return;
diff --git a/arch/x86/xen/setup.c b/arch/x86/xen/setup.c
index 8971a26d21a..94eac5c85cd 100644
--- a/arch/x86/xen/setup.c
+++ b/arch/x86/xen/setup.c
@@ -556,12 +556,9 @@ void __init xen_arch_setup(void)
 	       COMMAND_LINE_SIZE : MAX_GUEST_CMDLINE);
 
 	/* Set up idle, making sure it calls safe_halt() pvop */
-#ifdef CONFIG_X86_32
-	boot_cpu_data.hlt_works_ok = 1;
-#endif
 	disable_cpuidle();
 	disable_cpufreq();
-	WARN_ON(set_pm_idle_to_default());
+	WARN_ON(xen_set_default_idle());
 	fiddle_vdso();
 #ifdef CONFIG_NUMA
 	numa_off = 1;