Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/davej/cpufreq

* 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/davej/cpufreq:
  [CPUFREQ] remove redundant sprintf from request_module call.
  [CPUFREQ] cpufreq_stats.c: Fixed brace coding style issue
  [CPUFREQ] Fix memory leak in cpufreq_stat
  [CPUFREQ] cpufreq.h: Fix some checkpatch.pl coding style issues.
  [CPUFREQ] use dynamic debug instead of custom infrastructure
  [CPUFREQ] CPU hotplug, re-create sysfs directory and symlinks
  [CPUFREQ] Fix _OSC UUID in pcc-cpufreq

8 files changed, 94 insertions, 206 deletions

diff --git a/drivers/acpi/processor_perflib.c b/drivers/acpi/processor_perflib.c
index 3a73a93596e..85b32376dad 100644
--- a/drivers/acpi/processor_perflib.c
+++ b/drivers/acpi/processor_perflib.c
@@ -49,10 +49,6 @@ ACPI_MODULE_NAME("processor_perflib");
 
 static DEFINE_MUTEX(performance_mutex);
 
-/* Use cpufreq debug layer for _PPC changes. */
-#define cpufreq_printk(msg...) cpufreq_debug_printk(CPUFREQ_DEBUG_CORE, \
-						"cpufreq-core", msg)
-
 /*
  * _PPC support is implemented as a CPUfreq policy notifier:
  * This means each time a CPUfreq driver registered also with
@@ -145,7 +141,7 @@ static int acpi_processor_get_platform_limit(struct acpi_processor *pr)
 		return -ENODEV;
 	}
 
-	cpufreq_printk("CPU %d: _PPC is %d - frequency %s limited\n", pr->id,
+	pr_debug("CPU %d: _PPC is %d - frequency %s limited\n", pr->id,
 		       (int)ppc, ppc ? "" : "not");
 
 	pr->performance_platform_limit = (int)ppc;
diff --git a/drivers/cpufreq/Kconfig b/drivers/cpufreq/Kconfig
index ca8ee8093d6..b78baa547ef 100644
--- a/drivers/cpufreq/Kconfig
+++ b/drivers/cpufreq/Kconfig
@@ -18,19 +18,6 @@ if CPU_FREQ
 config CPU_FREQ_TABLE
 	tristate
 
-config CPU_FREQ_DEBUG
-	bool "Enable CPUfreq debugging"
-	help
-	  Say Y here to enable CPUfreq subsystem (including drivers)
-	  debugging. You will need to activate it via the kernel
-	  command line by passing
-	     cpufreq.debug=<value>
-
-	  To get <value>, add 
-	       1 to activate CPUfreq core debugging,
-	       2 to activate CPUfreq drivers debugging, and
-	       4 to activate CPUfreq governor debugging
-
 config CPU_FREQ_STAT
 	tristate "CPU frequency translation statistics"
 	select CPU_FREQ_TABLE
diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c
index 2dafc5c38ae..0a5bea9e358 100644
--- a/drivers/cpufreq/cpufreq.c
+++ b/drivers/cpufreq/cpufreq.c
@@ -32,9 +32,6 @@
 
 #include <trace/events/power.h>
 
-#define dprintk(msg...) cpufreq_debug_printk(CPUFREQ_DEBUG_CORE, \
-						"cpufreq-core", msg)
-
 /**
  * The "cpufreq driver" - the arch- or hardware-dependent low
  * level driver of CPUFreq support, and its spinlock. This lock
@@ -181,93 +178,6 @@ EXPORT_SYMBOL_GPL(cpufreq_cpu_put);
 
 
 /*********************************************************************
- *                     UNIFIED DEBUG HELPERS                         *
- *********************************************************************/
-#ifdef CONFIG_CPU_FREQ_DEBUG
-
-/* what part(s) of the CPUfreq subsystem are debugged? */
-static unsigned int debug;
-
-/* is the debug output ratelimit'ed using printk_ratelimit? User can
- * set or modify this value.
- */
-static unsigned int debug_ratelimit = 1;
-
-/* is the printk_ratelimit'ing enabled? It's enabled after a successful
- * loading of a cpufreq driver, temporarily disabled when a new policy
- * is set, and disabled upon cpufreq driver removal
- */
-static unsigned int disable_ratelimit = 1;
-static DEFINE_SPINLOCK(disable_ratelimit_lock);
-
-static void cpufreq_debug_enable_ratelimit(void)
-{
-	unsigned long flags;
-
-	spin_lock_irqsave(&disable_ratelimit_lock, flags);
-	if (disable_ratelimit)
-		disable_ratelimit--;
-	spin_unlock_irqrestore(&disable_ratelimit_lock, flags);
-}
-
-static void cpufreq_debug_disable_ratelimit(void)
-{
-	unsigned long flags;
-
-	spin_lock_irqsave(&disable_ratelimit_lock, flags);
-	disable_ratelimit++;
-	spin_unlock_irqrestore(&disable_ratelimit_lock, flags);
-}
-
-void cpufreq_debug_printk(unsigned int type, const char *prefix,
-			const char *fmt, ...)
-{
-	char s[256];
-	va_list args;
-	unsigned int len;
-	unsigned long flags;
-
-	WARN_ON(!prefix);
-	if (type & debug) {
-		spin_lock_irqsave(&disable_ratelimit_lock, flags);
-		if (!disable_ratelimit && debug_ratelimit
-					&& !printk_ratelimit()) {
-			spin_unlock_irqrestore(&disable_ratelimit_lock, flags);
-			return;
-		}
-		spin_unlock_irqrestore(&disable_ratelimit_lock, flags);
-
-		len = snprintf(s, 256, KERN_DEBUG "%s: ", prefix);
-
-		va_start(args, fmt);
-		len += vsnprintf(&s[len], (256 - len), fmt, args);
-		va_end(args);
-
-		printk(s);
-
-		WARN_ON(len < 5);
-	}
-}
-EXPORT_SYMBOL(cpufreq_debug_printk);
-
-
-module_param(debug, uint, 0644);
-MODULE_PARM_DESC(debug, "CPUfreq debugging: add 1 to debug core,"
-			" 2 to debug drivers, and 4 to debug governors.");
-
-module_param(debug_ratelimit, uint, 0644);
-MODULE_PARM_DESC(debug_ratelimit, "CPUfreq debugging:"
-					" set to 0 to disable ratelimiting.");
-
-#else /* !CONFIG_CPU_FREQ_DEBUG */
-
-static inline void cpufreq_debug_enable_ratelimit(void) { return; }
-static inline void cpufreq_debug_disable_ratelimit(void) { return; }
-
-#endif /* CONFIG_CPU_FREQ_DEBUG */
-
-
-/*********************************************************************
  *            EXTERNALLY AFFECTING FREQUENCY CHANGES                 *
  *********************************************************************/
 
@@ -291,7 +201,7 @@ static void adjust_jiffies(unsigned long val, struct cpufreq_freqs *ci)
 	if (!l_p_j_ref_freq) {
 		l_p_j_ref = loops_per_jiffy;
 		l_p_j_ref_freq = ci->old;
-		dprintk("saving %lu as reference value for loops_per_jiffy; "
+		pr_debug("saving %lu as reference value for loops_per_jiffy; "
 			"freq is %u kHz\n", l_p_j_ref, l_p_j_ref_freq);
 	}
 	if ((val == CPUFREQ_PRECHANGE  && ci->old < ci->new) ||
@@ -299,7 +209,7 @@ static void adjust_jiffies(unsigned long val, struct cpufreq_freqs *ci)
 	    (val == CPUFREQ_RESUMECHANGE || val == CPUFREQ_SUSPENDCHANGE)) {
 		loops_per_jiffy = cpufreq_scale(l_p_j_ref, l_p_j_ref_freq,
 								ci->new);
-		dprintk("scaling loops_per_jiffy to %lu "
+		pr_debug("scaling loops_per_jiffy to %lu "
 			"for frequency %u kHz\n", loops_per_jiffy, ci->new);
 	}
 }
@@ -326,7 +236,7 @@ void cpufreq_notify_transition(struct cpufreq_freqs *freqs, unsigned int state)
 	BUG_ON(irqs_disabled());
 
 	freqs->flags = cpufreq_driver->flags;
-	dprintk("notification %u of frequency transition to %u kHz\n",
+	pr_debug("notification %u of frequency transition to %u kHz\n",
 		state, freqs->new);
 
 	policy = per_cpu(cpufreq_cpu_data, freqs->cpu);
@@ -340,7 +250,7 @@ void cpufreq_notify_transition(struct cpufreq_freqs *freqs, unsigned int state)
 		if (!(cpufreq_driver->flags & CPUFREQ_CONST_LOOPS)) {
 			if ((policy) && (policy->cpu == freqs->cpu) &&
 			    (policy->cur) && (policy->cur != freqs->old)) {
-				dprintk("Warning: CPU frequency is"
+				pr_debug("Warning: CPU frequency is"
 					" %u, cpufreq assumed %u kHz.\n",
 					freqs->old, policy->cur);
 				freqs->old = policy->cur;
@@ -353,7 +263,7 @@ void cpufreq_notify_transition(struct cpufreq_freqs *freqs, unsigned int state)
 
 	case CPUFREQ_POSTCHANGE:
 		adjust_jiffies(CPUFREQ_POSTCHANGE, freqs);
-		dprintk("FREQ: %lu - CPU: %lu", (unsigned long)freqs->new,
+		pr_debug("FREQ: %lu - CPU: %lu", (unsigned long)freqs->new,
 			(unsigned long)freqs->cpu);
 		trace_power_frequency(POWER_PSTATE, freqs->new, freqs->cpu);
 		trace_cpu_frequency(freqs->new, freqs->cpu);
@@ -411,21 +321,14 @@ static int cpufreq_parse_governor(char *str_governor, unsigned int *policy,
 		t = __find_governor(str_governor);
 
 		if (t == NULL) {
-			char *name = kasprintf(GFP_KERNEL, "cpufreq_%s",
-								str_governor);
-
-			if (name) {
-				int ret;
+			int ret;
 
-				mutex_unlock(&cpufreq_governor_mutex);
-				ret = request_module("%s", name);
-				mutex_lock(&cpufreq_governor_mutex);
+			mutex_unlock(&cpufreq_governor_mutex);
+			ret = request_module("cpufreq_%s", str_governor);
+			mutex_lock(&cpufreq_governor_mutex);
 
-				if (ret == 0)
-					t = __find_governor(str_governor);
-			}
-
-			kfree(name);
+			if (ret == 0)
+				t = __find_governor(str_governor);
 		}
 
 		if (t != NULL) {
@@ -753,7 +656,7 @@ no_policy:
 static void cpufreq_sysfs_release(struct kobject *kobj)
 {
 	struct cpufreq_policy *policy = to_policy(kobj);
-	dprintk("last reference is dropped\n");
+	pr_debug("last reference is dropped\n");
 	complete(&policy->kobj_unregister);
 }
 
@@ -788,7 +691,7 @@ static int cpufreq_add_dev_policy(unsigned int cpu,
 	gov = __find_governor(per_cpu(cpufreq_cpu_governor, cpu));
 	if (gov) {
 		policy->governor = gov;
-		dprintk("Restoring governor %s for cpu %d\n",
+		pr_debug("Restoring governor %s for cpu %d\n",
 		       policy->governor->name, cpu);
 	}
 #endif
@@ -824,7 +727,7 @@ static int cpufreq_add_dev_policy(unsigned int cpu,
 			per_cpu(cpufreq_cpu_data, cpu) = managed_policy;
 			spin_unlock_irqrestore(&cpufreq_driver_lock, flags);
 
-			dprintk("CPU already managed, adding link\n");
+			pr_debug("CPU already managed, adding link\n");
 			ret = sysfs_create_link(&sys_dev->kobj,
 						&managed_policy->kobj,
 						"cpufreq");
@@ -865,7 +768,7 @@ static int cpufreq_add_dev_symlink(unsigned int cpu,
 		if (!cpu_online(j))
 			continue;
 
-		dprintk("CPU %u already managed, adding link\n", j);
+		pr_debug("CPU %u already managed, adding link\n", j);
 		managed_policy = cpufreq_cpu_get(cpu);
 		cpu_sys_dev = get_cpu_sysdev(j);
 		ret = sysfs_create_link(&cpu_sys_dev->kobj, &policy->kobj,
@@ -941,7 +844,7 @@ static int cpufreq_add_dev_interface(unsigned int cpu,
 	policy->user_policy.governor = policy->governor;
 
 	if (ret) {
-		dprintk("setting policy failed\n");
+		pr_debug("setting policy failed\n");
 		if (cpufreq_driver->exit)
 			cpufreq_driver->exit(policy);
 	}
@@ -977,8 +880,7 @@ static int cpufreq_add_dev(struct sys_device *sys_dev)
 	if (cpu_is_offline(cpu))
 		return 0;
 
-	cpufreq_debug_disable_ratelimit();
-	dprintk("adding CPU %u\n", cpu);
+	pr_debug("adding CPU %u\n", cpu);
 
 #ifdef CONFIG_SMP
 	/* check whether a different CPU already registered this
@@ -986,7 +888,6 @@ static int cpufreq_add_dev(struct sys_device *sys_dev)
 	policy = cpufreq_cpu_get(cpu);
 	if (unlikely(policy)) {
 		cpufreq_cpu_put(policy);
-		cpufreq_debug_enable_ratelimit();
 		return 0;
 	}
 #endif
@@ -1037,7 +938,7 @@ static int cpufreq_add_dev(struct sys_device *sys_dev)
 	 */
 	ret = cpufreq_driver->init(policy);
 	if (ret) {
-		dprintk("initialization failed\n");
+		pr_debug("initialization failed\n");
 		goto err_unlock_policy;
 	}
 	policy->user_policy.min = policy->min;
@@ -1063,8 +964,7 @@ static int cpufreq_add_dev(struct sys_device *sys_dev)
 
 	kobject_uevent(&policy->kobj, KOBJ_ADD);
 	module_put(cpufreq_driver->owner);
-	dprintk("initialization complete\n");
-	cpufreq_debug_enable_ratelimit();
+	pr_debug("initialization complete\n");
 
 	return 0;
 
@@ -1088,7 +988,6 @@ err_free_policy:
 nomem_out:
 	module_put(cpufreq_driver->owner);
 module_out:
-	cpufreq_debug_enable_ratelimit();
 	return ret;
 }
 
@@ -1112,15 +1011,13 @@ static int __cpufreq_remove_dev(struct sys_device *sys_dev)
 	unsigned int j;
 #endif
 
-	cpufreq_debug_disable_ratelimit();
-	dprintk("unregistering CPU %u\n", cpu);
+	pr_debug("unregistering CPU %u\n", cpu);
 
 	spin_lock_irqsave(&cpufreq_driver_lock, flags);
 	data = per_cpu(cpufreq_cpu_data, cpu);
 
 	if (!data) {
 		spin_unlock_irqrestore(&cpufreq_driver_lock, flags);
-		cpufreq_debug_enable_ratelimit();
 		unlock_policy_rwsem_write(cpu);
 		return -EINVAL;
 	}
@@ -1132,12 +1029,11 @@ static int __cpufreq_remove_dev(struct sys_device *sys_dev)
 	 * only need to unlink, put and exit
 	 */
 	if (unlikely(cpu != data->cpu)) {
-		dprintk("removing link\n");
+		pr_debug("removing link\n");
 		cpumask_clear_cpu(cpu, data->cpus);
 		spin_unlock_irqrestore(&cpufreq_driver_lock, flags);
 		kobj = &sys_dev->kobj;
 		cpufreq_cpu_put(data);
-		cpufreq_debug_enable_ratelimit();
 		unlock_policy_rwsem_write(cpu);
 		sysfs_remove_link(kobj, "cpufreq");
 		return 0;
@@ -1170,7 +1066,7 @@ static int __cpufreq_remove_dev(struct sys_device *sys_dev)
 		for_each_cpu(j, data->cpus) {
 			if (j == cpu)
 				continue;
-			dprintk("removing link for cpu %u\n", j);
+			pr_debug("removing link for cpu %u\n", j);
 #ifdef CONFIG_HOTPLUG_CPU
 			strncpy(per_cpu(cpufreq_cpu_governor, j),
 				data->governor->name, CPUFREQ_NAME_LEN);
@@ -1199,21 +1095,35 @@ static int __cpufreq_remove_dev(struct sys_device *sys_dev)
 	 * not referenced anymore by anybody before we proceed with
 	 * unloading.
 	 */
-	dprintk("waiting for dropping of refcount\n");
+	pr_debug("waiting for dropping of refcount\n");
 	wait_for_completion(cmp);
-	dprintk("wait complete\n");
+	pr_debug("wait complete\n");
 
 	lock_policy_rwsem_write(cpu);
 	if (cpufreq_driver->exit)
 		cpufreq_driver->exit(data);
 	unlock_policy_rwsem_write(cpu);
 
+#ifdef CONFIG_HOTPLUG_CPU
+	/* when the CPU which is the parent of the kobj is hotplugged
+	 * offline, check for siblings, and create cpufreq sysfs interface
+	 * and symlinks
+	 */
+	if (unlikely(cpumask_weight(data->cpus) > 1)) {
+		/* first sibling now owns the new sysfs dir */
+		cpumask_clear_cpu(cpu, data->cpus);
+		cpufreq_add_dev(get_cpu_sysdev(cpumask_first(data->cpus)));
+
+		/* finally remove our own symlink */
+		lock_policy_rwsem_write(cpu);
+		__cpufreq_remove_dev(sys_dev);
+	}
+#endif
+
 	free_cpumask_var(data->related_cpus);
 	free_cpumask_var(data->cpus);
 	kfree(data);
-	per_cpu(cpufreq_cpu_data, cpu) = NULL;
 
-	cpufreq_debug_enable_ratelimit();
 	return 0;
 }
 
@@ -1239,7 +1149,7 @@ static void handle_update(struct work_struct *work)
 	struct cpufreq_policy *policy =
 		container_of(work, struct cpufreq_policy, update);
 	unsigned int cpu = policy->cpu;
-	dprintk("handle_update for cpu %u called\n", cpu);
+	pr_debug("handle_update for cpu %u called\n", cpu);
 	cpufreq_update_policy(cpu);
 }
 
@@ -1257,7 +1167,7 @@ static void cpufreq_out_of_sync(unsigned int cpu, unsigned int old_freq,
 {
 	struct cpufreq_freqs freqs;
 
-	dprintk("Warning: CPU frequency out of sync: cpufreq and timing "
+	pr_debug("Warning: CPU frequency out of sync: cpufreq and timing "
 	       "core thinks of %u, is %u kHz.\n", old_freq, new_freq);
 
 	freqs.cpu = cpu;
@@ -1360,7 +1270,7 @@ static int cpufreq_bp_suspend(void)
 	int cpu = smp_processor_id();
 	struct cpufreq_policy *cpu_policy;
 
-	dprintk("suspending cpu %u\n", cpu);
+	pr_debug("suspending cpu %u\n", cpu);
 
 	/* If there's no policy for the boot CPU, we have nothing to do. */
 	cpu_policy = cpufreq_cpu_get(cpu);
@@ -1398,7 +1308,7 @@ static void cpufreq_bp_resume(void)
 	int cpu = smp_processor_id();
 	struct cpufreq_policy *cpu_policy;
 
-	dprintk("resuming cpu %u\n", cpu);
+	pr_debug("resuming cpu %u\n", cpu);
 
 	/* If there's no policy for the boot CPU, we have nothing to do. */
 	cpu_policy = cpufreq_cpu_get(cpu);
@@ -1510,7 +1420,7 @@ int __cpufreq_driver_target(struct cpufreq_policy *policy,
 {
 	int retval = -EINVAL;
 
-	dprintk("target for CPU %u: %u kHz, relation %u\n", policy->cpu,
+	pr_debug("target for CPU %u: %u kHz, relation %u\n", policy->cpu,
 		target_freq, relation);
 	if (cpu_online(policy->cpu) && cpufreq_driver->target)
 		retval = cpufreq_driver->target(policy, target_freq, relation);
@@ -1596,7 +1506,7 @@ static int __cpufreq_governor(struct cpufreq_policy *policy,
 	if (!try_module_get(policy->governor->owner))
 		return -EINVAL;
 
-	dprintk("__cpufreq_governor for CPU %u, event %u\n",
+	pr_debug("__cpufreq_governor for CPU %u, event %u\n",
 						policy->cpu, event);
 	ret = policy->governor->governor(policy, event);
 
@@ -1697,8 +1607,7 @@ static int __cpufreq_set_policy(struct cpufreq_policy *data,
 {
 	int ret = 0;
 
-	cpufreq_debug_disable_ratelimit();
-	dprintk("setting new policy for CPU %u: %u - %u kHz\n", policy->cpu,
+	pr_debug("setting new policy for CPU %u: %u - %u kHz\n", policy->cpu,
 		policy->min, policy->max);
 
 	memcpy(&policy->cpuinfo, &data->cpuinfo,
@@ -1735,19 +1644,19 @@ static int __cpufreq_set_policy(struct cpufreq_policy *data,
 	data->min = policy->min;
 	data->max = policy->max;
 
-	dprintk("new min and max freqs are %u - %u kHz\n",
+	pr_debug("new min and max freqs are %u - %u kHz\n",
 					data->min, data->max);
 
 	if (cpufreq_driver->setpolicy) {
 		data->policy = policy->policy;
-		dprintk("setting range\n");
+		pr_debug("setting range\n");
 		ret = cpufreq_driver->setpolicy(policy);
 	} else {
 		if (policy->governor != data->governor) {
 			/* save old, working values */
 			struct cpufreq_governor *old_gov = data->governor;
 
-			dprintk("governor switch\n");
+			pr_debug("governor switch\n");
 
 			/* end old governor */
 			if (data->governor)
@@ -1757,7 +1666,7 @@ static int __cpufreq_set_policy(struct cpufreq_policy *data,
 			data->governor = policy->governor;
 			if (__cpufreq_governor(data, CPUFREQ_GOV_START)) {
 				/* new governor failed, so re-start old one */
-				dprintk("starting governor %s failed\n",
+				pr_debug("starting governor %s failed\n",
 							data->governor->name);
 				if (old_gov) {
 					data->governor = old_gov;
@@ -1769,12 +1678,11 @@ static int __cpufreq_set_policy(struct cpufreq_policy *data,
 			}
 			/* might be a policy change, too, so fall through */
 		}
-		dprintk("governor: change or update limits\n");
+		pr_debug("governor: change or update limits\n");
 		__cpufreq_governor(data, CPUFREQ_GOV_LIMITS);
 	}
 
 error_out:
-	cpufreq_debug_enable_ratelimit();
 	return ret;
 }
 
@@ -1801,7 +1709,7 @@ int cpufreq_update_policy(unsigned int cpu)
 		goto fail;
 	}
 
-	dprintk("updating policy for CPU %u\n", cpu);
+	pr_debug("updating policy for CPU %u\n", cpu);
 	memcpy(&policy, data, sizeof(struct cpufreq_policy));
 	policy.min = data->user_policy.min;
 	policy.max = data->user_policy.max;
@@ -1813,7 +1721,7 @@ int cpufreq_update_policy(unsigned int cpu)
 	if (cpufreq_driver->get) {
 		policy.cur = cpufreq_driver->get(cpu);
 		if (!data->cur) {
-			dprintk("Driver did not initialize current freq");
+			pr_debug("Driver did not initialize current freq");
 			data->cur = policy.cur;
 		} else {
 			if (data->cur != policy.cur)
@@ -1889,7 +1797,7 @@ int cpufreq_register_driver(struct cpufreq_driver *driver_data)
 	    ((!driver_data->setpolicy) && (!driver_data->target)))
 		return -EINVAL;
 
-	dprintk("trying to register driver %s\n", driver_data->name);
+	pr_debug("trying to register driver %s\n", driver_data->name);
 
 	if (driver_data->setpolicy)
 		driver_data->flags |= CPUFREQ_CONST_LOOPS;
@@ -1920,15 +1828,14 @@ int cpufreq_register_driver(struct cpufreq_driver *driver_data)
 
 		/* if all ->init() calls failed, unregister */
 		if (ret) {
-			dprintk("no CPU initialized for driver %s\n",
+			pr_debug("no CPU initialized for driver %s\n",
 							driver_data->name);
 			goto err_sysdev_unreg;
 		}
 	}
 
 	register_hotcpu_notifier(&cpufreq_cpu_notifier);
-	dprintk("driver %s up and running\n", driver_data->name);
-	cpufreq_debug_enable_ratelimit();
+	pr_debug("driver %s up and running\n", driver_data->name);
 
 	return 0;
 err_sysdev_unreg:
@@ -1955,14 +1862,10 @@ int cpufreq_unregister_driver(struct cpufreq_driver *driver)
 {
 	unsigned long flags;
 
-	cpufreq_debug_disable_ratelimit();
-
-	if (!cpufreq_driver || (driver != cpufreq_driver)) {
-		cpufreq_debug_enable_ratelimit();
+	if (!cpufreq_driver || (driver != cpufreq_driver))
 		return -EINVAL;
-	}
 
-	dprintk("unregistering driver %s\n", driver->name);
+	pr_debug("unregistering driver %s\n", driver->name);
 
 	sysdev_driver_unregister(&cpu_sysdev_class, &cpufreq_sysdev_driver);
 	unregister_hotcpu_notifier(&cpufreq_cpu_notifier);
diff --git a/drivers/cpufreq/cpufreq_performance.c b/drivers/cpufreq/cpufreq_performance.c
index 7e2e515087f..f13a8a9af6a 100644
--- a/drivers/cpufreq/cpufreq_performance.c
+++ b/drivers/cpufreq/cpufreq_performance.c
@@ -15,9 +15,6 @@
 #include <linux/cpufreq.h>
 #include <linux/init.h>
 
-#define dprintk(msg...) \
-	cpufreq_debug_printk(CPUFREQ_DEBUG_GOVERNOR, "performance", msg)
-
 
 static int cpufreq_governor_performance(struct cpufreq_policy *policy,
 					unsigned int event)
@@ -25,7 +22,7 @@ static int cpufreq_governor_performance(struct cpufreq_policy *policy,
 	switch (event) {
 	case CPUFREQ_GOV_START:
 	case CPUFREQ_GOV_LIMITS:
-		dprintk("setting to %u kHz because of event %u\n",
+		pr_debug("setting to %u kHz because of event %u\n",
 						policy->max, event);
 		__cpufreq_driver_target(policy, policy->max,
 						CPUFREQ_RELATION_H);
diff --git a/drivers/cpufreq/cpufreq_powersave.c b/drivers/cpufreq/cpufreq_powersave.c
index e6db5faf3eb..4c2eb512f2b 100644
--- a/drivers/cpufreq/cpufreq_powersave.c
+++ b/drivers/cpufreq/cpufreq_powersave.c
@@ -15,16 +15,13 @@
 #include <linux/cpufreq.h>
 #include <linux/init.h>
 
-#define dprintk(msg...) \
-	cpufreq_debug_printk(CPUFREQ_DEBUG_GOVERNOR, "powersave", msg)
-
 static int cpufreq_governor_powersave(struct cpufreq_policy *policy,
 					unsigned int event)
 {
 	switch (event) {
 	case CPUFREQ_GOV_START:
 	case CPUFREQ_GOV_LIMITS:
-		dprintk("setting to %u kHz because of event %u\n",
+		pr_debug("setting to %u kHz because of event %u\n",
 							policy->min, event);
 		__cpufreq_driver_target(policy, policy->min,
 						CPUFREQ_RELATION_L);
diff --git a/drivers/cpufreq/cpufreq_stats.c b/drivers/cpufreq/cpufreq_stats.c
index 00d73fc8e4e..b60a4c26368 100644
--- a/drivers/cpufreq/cpufreq_stats.c
+++ b/drivers/cpufreq/cpufreq_stats.c
@@ -165,17 +165,27 @@ static int freq_table_get_index(struct cpufreq_stats *stat, unsigned int freq)
 	return -1;
 }
 
+/* should be called late in the CPU removal sequence so that the stats
+ * memory is still available in case someone tries to use it.
+ */
 static void cpufreq_stats_free_table(unsigned int cpu)
 {
 	struct cpufreq_stats *stat = per_cpu(cpufreq_stats_table, cpu);
-	struct cpufreq_policy *policy = cpufreq_cpu_get(cpu);
-	if (policy && policy->cpu == cpu)
-		sysfs_remove_group(&policy->kobj, &stats_attr_group);
 	if (stat) {
 		kfree(stat->time_in_state);
 		kfree(stat);
 	}
 	per_cpu(cpufreq_stats_table, cpu) = NULL;
+}
+
+/* must be called early in the CPU removal sequence (before
+ * cpufreq_remove_dev) so that policy is still valid.
+ */
+static void cpufreq_stats_free_sysfs(unsigned int cpu)
+{
+	struct cpufreq_policy *policy = cpufreq_cpu_get(cpu);
+	if (policy && policy->cpu == cpu)
+		sysfs_remove_group(&policy->kobj, &stats_attr_group);
 	if (policy)
 		cpufreq_cpu_put(policy);
 }
@@ -316,6 +326,9 @@ static int __cpuinit cpufreq_stat_cpu_callback(struct notifier_block *nfb,
 	case CPU_ONLINE_FROZEN:
 		cpufreq_update_policy(cpu);
 		break;
+	case CPU_DOWN_PREPARE:
+		cpufreq_stats_free_sysfs(cpu);
+		break;
 	case CPU_DEAD:
 	case CPU_DEAD_FROZEN:
 		cpufreq_stats_free_table(cpu);
@@ -324,9 +337,10 @@ static int __cpuinit cpufreq_stat_cpu_callback(struct notifier_block *nfb,
 	return NOTIFY_OK;
 }
 
-static struct notifier_block cpufreq_stat_cpu_notifier __refdata =
-{
+/* priority=1 so this will get called before cpufreq_remove_dev */
+static struct notifier_block cpufreq_stat_cpu_notifier __refdata = {
 	.notifier_call = cpufreq_stat_cpu_callback,
+	.priority = 1,
 };
 
 static struct notifier_block notifier_policy_block = {
diff --git a/drivers/cpufreq/cpufreq_userspace.c b/drivers/cpufreq/cpufreq_userspace.c
index 66d2d1d6c80..f231015904c 100644
--- a/drivers/cpufreq/cpufreq_userspace.c
+++ b/drivers/cpufreq/cpufreq_userspace.c
@@ -37,9 +37,6 @@ static DEFINE_PER_CPU(unsigned int, cpu_is_managed);
 static DEFINE_MUTEX(userspace_mutex);
 static int cpus_using_userspace_governor;
 
-#define dprintk(msg...) \
-	cpufreq_debug_printk(CPUFREQ_DEBUG_GOVERNOR, "userspace", msg)
-
 /* keep track of frequency transitions */
 static int
 userspace_cpufreq_notifier(struct notifier_block *nb, unsigned long val,
@@ -50,7 +47,7 @@ userspace_cpufreq_notifier(struct notifier_block *nb, unsigned long val,
 	if (!per_cpu(cpu_is_managed, freq->cpu))
 		return 0;
 
-	dprintk("saving cpu_cur_freq of cpu %u to be %u kHz\n",
+	pr_debug("saving cpu_cur_freq of cpu %u to be %u kHz\n",
 			freq->cpu, freq->new);
 	per_cpu(cpu_cur_freq, freq->cpu) = freq->new;
 
@@ -73,7 +70,7 @@ static int cpufreq_set(struct cpufreq_policy *policy, unsigned int freq)
 {
 	int ret = -EINVAL;
 
-	dprintk("cpufreq_set for cpu %u, freq %u kHz\n", policy->cpu, freq);
+	pr_debug("cpufreq_set for cpu %u, freq %u kHz\n", policy->cpu, freq);
 
 	mutex_lock(&userspace_mutex);
 	if (!per_cpu(cpu_is_managed, policy->cpu))
@@ -134,7 +131,7 @@ static int cpufreq_governor_userspace(struct cpufreq_policy *policy,
 		per_cpu(cpu_max_freq, cpu) = policy->max;
 		per_cpu(cpu_cur_freq, cpu) = policy->cur;
 		per_cpu(cpu_set_freq, cpu) = policy->cur;
-		dprintk("managing cpu %u started "
+		pr_debug("managing cpu %u started "
 			"(%u - %u kHz, currently %u kHz)\n",
 				cpu,
 				per_cpu(cpu_min_freq, cpu),
@@ -156,12 +153,12 @@ static int cpufreq_governor_userspace(struct cpufreq_policy *policy,
 		per_cpu(cpu_min_freq, cpu) = 0;
 		per_cpu(cpu_max_freq, cpu) = 0;
 		per_cpu(cpu_set_freq, cpu) = 0;
-		dprintk("managing cpu %u stopped\n", cpu);
+		pr_debug("managing cpu %u stopped\n", cpu);
 		mutex_unlock(&userspace_mutex);
 		break;
 	case CPUFREQ_GOV_LIMITS:
 		mutex_lock(&userspace_mutex);
-		dprintk("limit event for cpu %u: %u - %u kHz, "
+		pr_debug("limit event for cpu %u: %u - %u kHz, "
 			"currently %u kHz, last set to %u kHz\n",
 			cpu, policy->min, policy->max,
 			per_cpu(cpu_cur_freq, cpu),
diff --git a/drivers/cpufreq/freq_table.c b/drivers/cpufreq/freq_table.c
index 05432216e22..90431cb9280 100644
--- a/drivers/cpufreq/freq_table.c
+++ b/drivers/cpufreq/freq_table.c
@@ -14,9 +14,6 @@
 #include <linux/init.h>
 #include <linux/cpufreq.h>
 
-#define dprintk(msg...) \
-	cpufreq_debug_printk(CPUFREQ_DEBUG_CORE, "freq-table", msg)
-
 /*********************************************************************
  *                     FREQUENCY TABLE HELPERS                       *
  *********************************************************************/
@@ -31,11 +28,11 @@ int cpufreq_frequency_table_cpuinfo(struct cpufreq_policy *policy,
 	for (i = 0; (table[i].frequency != CPUFREQ_TABLE_END); i++) {
 		unsigned int freq = table[i].frequency;
 		if (freq == CPUFREQ_ENTRY_INVALID) {
-			dprintk("table entry %u is invalid, skipping\n", i);
+			pr_debug("table entry %u is invalid, skipping\n", i);
 
 			continue;
 		}
-		dprintk("table entry %u: %u kHz, %u index\n",
+		pr_debug("table entry %u: %u kHz, %u index\n",
 					i, freq, table[i].index);
 		if (freq < min_freq)
 			min_freq = freq;
@@ -61,7 +58,7 @@ int cpufreq_frequency_table_verify(struct cpufreq_policy *policy,
 	unsigned int i;
 	unsigned int count = 0;
 
-	dprintk("request for verification of policy (%u - %u kHz) for cpu %u\n",
+	pr_debug("request for verification of policy (%u - %u kHz) for cpu %u\n",
 					policy->min, policy->max, policy->cpu);
 
 	if (!cpu_online(policy->cpu))
@@ -86,7 +83,7 @@ int cpufreq_frequency_table_verify(struct cpufreq_policy *policy,
 	cpufreq_verify_within_limits(policy, policy->cpuinfo.min_freq,
 				     policy->cpuinfo.max_freq);
 
-	dprintk("verification lead to (%u - %u kHz) for cpu %u\n",
+	pr_debug("verification lead to (%u - %u kHz) for cpu %u\n",
 				policy->min, policy->max, policy->cpu);
 
 	return 0;
@@ -110,7 +107,7 @@ int cpufreq_frequency_table_target(struct cpufreq_policy *policy,
 	};
 	unsigned int i;
 
-	dprintk("request for target %u kHz (relation: %u) for cpu %u\n",
+	pr_debug("request for target %u kHz (relation: %u) for cpu %u\n",
 					target_freq, relation, policy->cpu);
 
 	switch (relation) {
@@ -167,7 +164,7 @@ int cpufreq_frequency_table_target(struct cpufreq_policy *policy,
 	} else
 		*index = optimal.index;
 
-	dprintk("target is %u (%u kHz, %u)\n", *index, table[*index].frequency,
+	pr_debug("target is %u (%u kHz, %u)\n", *index, table[*index].frequency,
 		table[*index].index);
 
 	return 0;
@@ -216,14 +213,14 @@ EXPORT_SYMBOL_GPL(cpufreq_freq_attr_scaling_available_freqs);
 void cpufreq_frequency_table_get_attr(struct cpufreq_frequency_table *table,
 				      unsigned int cpu)
 {
-	dprintk("setting show_table for cpu %u to %p\n", cpu, table);
+	pr_debug("setting show_table for cpu %u to %p\n", cpu, table);
 	per_cpu(cpufreq_show_table, cpu) = table;
 }
 EXPORT_SYMBOL_GPL(cpufreq_frequency_table_get_attr);
 
 void cpufreq_frequency_table_put_attr(unsigned int cpu)
 {
-	dprintk("clearing show_table for cpu %u\n", cpu);
+	pr_debug("clearing show_table for cpu %u\n", cpu);
 	per_cpu(cpufreq_show_table, cpu) = NULL;
 }
 EXPORT_SYMBOL_GPL(cpufreq_frequency_table_put_attr);