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: (35 commits)
  [CPUFREQ] Prevent p4-clockmod from auto-binding to the ondemand governor.
  [CPUFREQ] Make cpufreq-nforce2 less obnoxious
  [CPUFREQ] p4-clockmod reports wrong frequency.
  [CPUFREQ] powernow-k8: Use a common exit path.
  [CPUFREQ] Change link order of x86 cpufreq modules
  [CPUFREQ] conservative: remove 10x from def_sampling_rate
  [CPUFREQ] conservative: fixup governor to function more like ondemand logic
  [CPUFREQ] conservative: fix dbs_cpufreq_notifier so freq is not locked
  [CPUFREQ] conservative: amend author's email address
  [CPUFREQ] Use swap() in longhaul.c
  [CPUFREQ] checkpatch cleanups for acpi-cpufreq
  [CPUFREQ] powernow-k8: Only print error message once, not per core.
  [CPUFREQ] ondemand/conservative: sanitize sampling_rate restrictions
  [CPUFREQ] ondemand/conservative: deprecate sampling_rate{min,max}
  [CPUFREQ] powernow-k8: Always compile powernow-k8 driver with ACPI support
  [CPUFREQ] Introduce /sys/devices/system/cpu/cpu*/cpufreq/cpuinfo_transition_latency
  [CPUFREQ] checkpatch cleanups for powernow-k8
  [CPUFREQ] checkpatch cleanups for ondemand governor.
  [CPUFREQ] checkpatch cleanups for powernow-k7
  [CPUFREQ] checkpatch cleanups for speedstep related drivers.
  ...

6 files changed, 379 insertions, 273 deletions

diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c
index d6daf3c..d270e8e 100644
--- a/drivers/cpufreq/cpufreq.c
+++ b/drivers/cpufreq/cpufreq.c
@@ -104,7 +104,8 @@ EXPORT_SYMBOL_GPL(unlock_policy_rwsem_write);
 
 
 /* internal prototypes */
-static int __cpufreq_governor(struct cpufreq_policy *policy, unsigned int event);
+static int __cpufreq_governor(struct cpufreq_policy *policy,
+		unsigned int event);
 static unsigned int __cpufreq_get(unsigned int cpu);
 static void handle_update(struct work_struct *work);
 
@@ -128,7 +129,7 @@ static int __init init_cpufreq_transition_notifier_list(void)
 pure_initcall(init_cpufreq_transition_notifier_list);
 
 static LIST_HEAD(cpufreq_governor_list);
-static DEFINE_MUTEX (cpufreq_governor_mutex);
+static DEFINE_MUTEX(cpufreq_governor_mutex);
 
 struct cpufreq_policy *cpufreq_cpu_get(unsigned int cpu)
 {
@@ -371,7 +372,7 @@ static struct cpufreq_governor *__find_governor(const char *str_governor)
 	struct cpufreq_governor *t;
 
 	list_for_each_entry(t, &cpufreq_governor_list, governor_list)
-		if (!strnicmp(str_governor,t->name,CPUFREQ_NAME_LEN))
+		if (!strnicmp(str_governor, t->name, CPUFREQ_NAME_LEN))
 			return t;
 
 	return NULL;
@@ -429,15 +430,11 @@ static int cpufreq_parse_governor(char *str_governor, unsigned int *policy,
 
 		mutex_unlock(&cpufreq_governor_mutex);
 	}
-  out:
+out:
 	return err;
 }
 
 
-/* drivers/base/cpu.c */
-extern struct sysdev_class cpu_sysdev_class;
-
-
 /**
  * cpufreq_per_cpu_attr_read() / show_##file_name() -
  * print out cpufreq information
@@ -450,11 +447,12 @@ extern struct sysdev_class cpu_sysdev_class;
 static ssize_t show_##file_name				\
 (struct cpufreq_policy *policy, char *buf)		\
 {							\
-	return sprintf (buf, "%u\n", policy->object);	\
+	return sprintf(buf, "%u\n", policy->object);	\
 }
 
 show_one(cpuinfo_min_freq, cpuinfo.min_freq);
 show_one(cpuinfo_max_freq, cpuinfo.max_freq);
+show_one(cpuinfo_transition_latency, cpuinfo.transition_latency);
 show_one(scaling_min_freq, min);
 show_one(scaling_max_freq, max);
 show_one(scaling_cur_freq, cur);
@@ -476,7 +474,7 @@ static ssize_t store_##file_name					\
 	if (ret)							\
 		return -EINVAL;						\
 									\
-	ret = sscanf (buf, "%u", &new_policy.object);			\
+	ret = sscanf(buf, "%u", &new_policy.object);			\
 	if (ret != 1)							\
 		return -EINVAL;						\
 									\
@@ -486,8 +484,8 @@ static ssize_t store_##file_name					\
 	return ret ? ret : count;					\
 }
 
-store_one(scaling_min_freq,min);
-store_one(scaling_max_freq,max);
+store_one(scaling_min_freq, min);
+store_one(scaling_max_freq, max);
 
 /**
  * show_cpuinfo_cur_freq - current CPU frequency as detected by hardware
@@ -507,12 +505,13 @@ static ssize_t show_cpuinfo_cur_freq(struct cpufreq_policy *policy,
  */
 static ssize_t show_scaling_governor(struct cpufreq_policy *policy, char *buf)
 {
-	if(policy->policy == CPUFREQ_POLICY_POWERSAVE)
+	if (policy->policy == CPUFREQ_POLICY_POWERSAVE)
 		return sprintf(buf, "powersave\n");
 	else if (policy->policy == CPUFREQ_POLICY_PERFORMANCE)
 		return sprintf(buf, "performance\n");
 	else if (policy->governor)
-		return scnprintf(buf, CPUFREQ_NAME_LEN, "%s\n", policy->governor->name);
+		return scnprintf(buf, CPUFREQ_NAME_LEN, "%s\n",
+				policy->governor->name);
 	return -EINVAL;
 }
 
@@ -531,7 +530,7 @@ static ssize_t store_scaling_governor(struct cpufreq_policy *policy,
 	if (ret)
 		return ret;
 
-	ret = sscanf (buf, "%15s", str_governor);
+	ret = sscanf(buf, "%15s", str_governor);
 	if (ret != 1)
 		return -EINVAL;
 
@@ -575,7 +574,8 @@ static ssize_t show_scaling_available_governors(struct cpufreq_policy *policy,
 	}
 
 	list_for_each_entry(t, &cpufreq_governor_list, governor_list) {
-		if (i >= (ssize_t) ((PAGE_SIZE / sizeof(char)) - (CPUFREQ_NAME_LEN + 2)))
+		if (i >= (ssize_t) ((PAGE_SIZE / sizeof(char))
+		    - (CPUFREQ_NAME_LEN + 2)))
 			goto out;
 		i += scnprintf(&buf[i], CPUFREQ_NAME_LEN, "%s ", t->name);
 	}
@@ -594,7 +594,7 @@ static ssize_t show_cpus(const struct cpumask *mask, char *buf)
 			i += scnprintf(&buf[i], (PAGE_SIZE - i - 2), " ");
 		i += scnprintf(&buf[i], (PAGE_SIZE - i - 2), "%u", cpu);
 		if (i >= (PAGE_SIZE - 5))
-		    break;
+			break;
 	}
 	i += sprintf(&buf[i], "\n");
 	return i;
@@ -660,6 +660,7 @@ __ATTR(_name, 0644, show_##_name, store_##_name)
 define_one_ro0400(cpuinfo_cur_freq);
 define_one_ro(cpuinfo_min_freq);
 define_one_ro(cpuinfo_max_freq);
+define_one_ro(cpuinfo_transition_latency);
 define_one_ro(scaling_available_governors);
 define_one_ro(scaling_driver);
 define_one_ro(scaling_cur_freq);
@@ -673,6 +674,7 @@ define_one_rw(scaling_setspeed);
 static struct attribute *default_attrs[] = {
 	&cpuinfo_min_freq.attr,
 	&cpuinfo_max_freq.attr,
+	&cpuinfo_transition_latency.attr,
 	&scaling_min_freq.attr,
 	&scaling_max_freq.attr,
 	&affected_cpus.attr,
@@ -684,10 +686,10 @@ static struct attribute *default_attrs[] = {
 	NULL
 };
 
-#define to_policy(k) container_of(k,struct cpufreq_policy,kobj)
-#define to_attr(a) container_of(a,struct freq_attr,attr)
+#define to_policy(k) container_of(k, struct cpufreq_policy, kobj)
+#define to_attr(a) container_of(a, struct freq_attr, attr)
 
-static ssize_t show(struct kobject *kobj, struct attribute *attr ,char *buf)
+static ssize_t show(struct kobject *kobj, struct attribute *attr, char *buf)
 {
 	struct cpufreq_policy *policy = to_policy(kobj);
 	struct freq_attr *fattr = to_attr(attr);
@@ -853,10 +855,10 @@ static int cpufreq_add_dev(struct sys_device *sys_dev)
 		if (cpu == j)
 			continue;
 
-		/* check for existing affected CPUs.  They may not be aware
-		 * of it due to CPU Hotplug.
+		/* Check for existing affected CPUs.
+		 * They may not be aware of it due to CPU Hotplug.
 		 */
-		managed_policy = cpufreq_cpu_get(j);		// FIXME: Where is this released?  What about error paths?
+		managed_policy = cpufreq_cpu_get(j);		/* FIXME: Where is this released?  What about error paths? */
 		if (unlikely(managed_policy)) {
 
 			/* Set proper policy_cpu */
@@ -1127,8 +1129,8 @@ static void handle_update(struct work_struct *work)
  *	@old_freq: CPU frequency the kernel thinks the CPU runs at
  *	@new_freq: CPU frequency the CPU actually runs at
  *
- *	We adjust to current frequency first, and need to clean up later. So either call
- *	to cpufreq_update_policy() or schedule handle_update()).
+ *	We adjust to current frequency first, and need to clean up later.
+ *	So either call to cpufreq_update_policy() or schedule handle_update()).
  */
 static void cpufreq_out_of_sync(unsigned int cpu, unsigned int old_freq,
 				unsigned int new_freq)
@@ -1610,7 +1612,8 @@ EXPORT_SYMBOL_GPL(cpufreq_unregister_governor);
 
 /**
  * cpufreq_get_policy - get the current cpufreq_policy
- * @policy: struct cpufreq_policy into which the current cpufreq_policy is written
+ * @policy: struct cpufreq_policy into which the current cpufreq_policy
+ *	is written
  *
  * Reads the current cpufreq policy.
  */
diff --git a/drivers/cpufreq/cpufreq_conservative.c b/drivers/cpufreq/cpufreq_conservative.c
index 0320962..2ecd95e 100644
--- a/drivers/cpufreq/cpufreq_conservative.c
+++ b/drivers/cpufreq/cpufreq_conservative.c
@@ -4,7 +4,7 @@
  *  Copyright (C)  2001 Russell King
  *            (C)  2003 Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>.
  *                      Jun Nakajima <jun.nakajima@intel.com>
- *            (C)  2004 Alexander Clouter <alex-kernel@digriz.org.uk>
+ *            (C)  2009 Alexander Clouter <alex@digriz.org.uk>
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 as
@@ -13,22 +13,17 @@
 
 #include <linux/kernel.h>
 #include <linux/module.h>
-#include <linux/smp.h>
 #include <linux/init.h>
-#include <linux/interrupt.h>
-#include <linux/ctype.h>
 #include <linux/cpufreq.h>
-#include <linux/sysctl.h>
-#include <linux/types.h>
-#include <linux/fs.h>
-#include <linux/sysfs.h>
 #include <linux/cpu.h>
-#include <linux/kmod.h>
-#include <linux/workqueue.h>
 #include <linux/jiffies.h>
 #include <linux/kernel_stat.h>
-#include <linux/percpu.h>
 #include <linux/mutex.h>
+#include <linux/hrtimer.h>
+#include <linux/tick.h>
+#include <linux/ktime.h>
+#include <linux/sched.h>
+
 /*
  * dbs is used in this file as a shortform for demandbased switching
  * It helps to keep variable names smaller, simpler
@@ -43,19 +38,31 @@
  * latency of the processor. The governor will work on any processor with
  * transition latency <= 10mS, using appropriate sampling
  * rate.
- * For CPUs with transition latency > 10mS (mostly drivers
- * with CPUFREQ_ETERNAL), this governor will not work.
+ * For CPUs with transition latency > 10mS (mostly drivers with CPUFREQ_ETERNAL)
+ * this governor will not work.
  * All times here are in uS.
  */
 static unsigned int def_sampling_rate;
 #define MIN_SAMPLING_RATE_RATIO			(2)
 /* for correct statistics, we need at least 10 ticks between each measure */
-#define MIN_STAT_SAMPLING_RATE			\
+#define MIN_STAT_SAMPLING_RATE 			\
 			(MIN_SAMPLING_RATE_RATIO * jiffies_to_usecs(10))
 #define MIN_SAMPLING_RATE			\
 			(def_sampling_rate / MIN_SAMPLING_RATE_RATIO)
+/* Above MIN_SAMPLING_RATE will vanish with its sysfs file soon
+ * Define the minimal settable sampling rate to the greater of:
+ *   - "HW transition latency" * 100 (same as default sampling / 10)
+ *   - MIN_STAT_SAMPLING_RATE
+ * To avoid that userspace shoots itself.
+*/
+static unsigned int minimum_sampling_rate(void)
+{
+	return max(def_sampling_rate / 10, MIN_STAT_SAMPLING_RATE);
+}
+
+/* This will also vanish soon with removing sampling_rate_max */
 #define MAX_SAMPLING_RATE			(500 * def_sampling_rate)
-#define DEF_SAMPLING_RATE_LATENCY_MULTIPLIER	(1000)
+#define LATENCY_MULTIPLIER			(1000)
 #define DEF_SAMPLING_DOWN_FACTOR		(1)
 #define MAX_SAMPLING_DOWN_FACTOR		(10)
 #define TRANSITION_LATENCY_LIMIT		(10 * 1000 * 1000)
@@ -63,12 +70,15 @@ static unsigned int def_sampling_rate;
 static void do_dbs_timer(struct work_struct *work);
 
 struct cpu_dbs_info_s {
+	cputime64_t prev_cpu_idle;
+	cputime64_t prev_cpu_wall;
+	cputime64_t prev_cpu_nice;
 	struct cpufreq_policy *cur_policy;
-	unsigned int prev_cpu_idle_up;
-	unsigned int prev_cpu_idle_down;
-	unsigned int enable;
+	struct delayed_work work;
 	unsigned int down_skip;
 	unsigned int requested_freq;
+	int cpu;
+	unsigned int enable:1;
 };
 static DEFINE_PER_CPU(struct cpu_dbs_info_s, cpu_dbs_info);
 
@@ -82,19 +92,18 @@ static unsigned int dbs_enable;	/* number of CPUs using this policy */
  * cpu_hotplug lock should be taken before that. Note that cpu_hotplug lock
  * is recursive for the same process. -Venki
  */
-static DEFINE_MUTEX (dbs_mutex);
-static DECLARE_DELAYED_WORK(dbs_work, do_dbs_timer);
+static DEFINE_MUTEX(dbs_mutex);
 
-struct dbs_tuners {
+static struct workqueue_struct	*kconservative_wq;
+
+static struct dbs_tuners {
 	unsigned int sampling_rate;
 	unsigned int sampling_down_factor;
 	unsigned int up_threshold;
 	unsigned int down_threshold;
 	unsigned int ignore_nice;
 	unsigned int freq_step;
-};
-
-static struct dbs_tuners dbs_tuners_ins = {
+} dbs_tuners_ins = {
 	.up_threshold = DEF_FREQUENCY_UP_THRESHOLD,
 	.down_threshold = DEF_FREQUENCY_DOWN_THRESHOLD,
 	.sampling_down_factor = DEF_SAMPLING_DOWN_FACTOR,
@@ -102,18 +111,37 @@ static struct dbs_tuners dbs_tuners_ins = {
 	.freq_step = 5,
 };
 
-static inline unsigned int get_cpu_idle_time(unsigned int cpu)
+static inline cputime64_t get_cpu_idle_time_jiffy(unsigned int cpu,
+							cputime64_t *wall)
 {
-	unsigned int add_nice = 0, ret;
+	cputime64_t idle_time;
+	cputime64_t cur_wall_time;
+	cputime64_t busy_time;
 
-	if (dbs_tuners_ins.ignore_nice)
-		add_nice = kstat_cpu(cpu).cpustat.nice;
+	cur_wall_time = jiffies64_to_cputime64(get_jiffies_64());
+	busy_time = cputime64_add(kstat_cpu(cpu).cpustat.user,
+			kstat_cpu(cpu).cpustat.system);
+
+	busy_time = cputime64_add(busy_time, kstat_cpu(cpu).cpustat.irq);
+	busy_time = cputime64_add(busy_time, kstat_cpu(cpu).cpustat.softirq);
+	busy_time = cputime64_add(busy_time, kstat_cpu(cpu).cpustat.steal);
+	busy_time = cputime64_add(busy_time, kstat_cpu(cpu).cpustat.nice);
+
+	idle_time = cputime64_sub(cur_wall_time, busy_time);
+	if (wall)
+		*wall = cur_wall_time;
+
+	return idle_time;
+}
+
+static inline cputime64_t get_cpu_idle_time(unsigned int cpu, cputime64_t *wall)
+{
+	u64 idle_time = get_cpu_idle_time_us(cpu, wall);
 
-	ret = kstat_cpu(cpu).cpustat.idle +
-		kstat_cpu(cpu).cpustat.iowait +
-		add_nice;
+	if (idle_time == -1ULL)
+		return get_cpu_idle_time_jiffy(cpu, wall);
 
-	return ret;
+	return idle_time;
 }
 
 /* keep track of frequency transitions */
@@ -125,10 +153,21 @@ dbs_cpufreq_notifier(struct notifier_block *nb, unsigned long val,
 	struct cpu_dbs_info_s *this_dbs_info = &per_cpu(cpu_dbs_info,
 							freq->cpu);
 
+	struct cpufreq_policy *policy;
+
 	if (!this_dbs_info->enable)
 		return 0;
 
-	this_dbs_info->requested_freq = freq->new;
+	policy = this_dbs_info->cur_policy;
+
+	/*
+	 * we only care if our internally tracked freq moves outside
+	 * the 'valid' ranges of freqency available to us otherwise
+	 * we do not change it
+	*/
+	if (this_dbs_info->requested_freq > policy->max
+			|| this_dbs_info->requested_freq < policy->min)
+		this_dbs_info->requested_freq = freq->new;
 
 	return 0;
 }
@@ -140,16 +179,31 @@ static struct notifier_block dbs_cpufreq_notifier_block = {
 /************************** sysfs interface ************************/
 static ssize_t show_sampling_rate_max(struct cpufreq_policy *policy, char *buf)
 {
-	return sprintf (buf, "%u\n", MAX_SAMPLING_RATE);
+	static int print_once;
+
+	if (!print_once) {
+		printk(KERN_INFO "CPUFREQ: conservative sampling_rate_max "
+		       "sysfs file is deprecated - used by: %s\n",
+		       current->comm);
+		print_once = 1;
+	}
+	return sprintf(buf, "%u\n", MAX_SAMPLING_RATE);
 }
 
 static ssize_t show_sampling_rate_min(struct cpufreq_policy *policy, char *buf)
 {
-	return sprintf (buf, "%u\n", MIN_SAMPLING_RATE);
+	static int print_once;
+
+	if (!print_once) {
+		printk(KERN_INFO "CPUFREQ: conservative sampling_rate_max "
+		       "sysfs file is deprecated - used by: %s\n", current->comm);
+		print_once = 1;
+	}
+	return sprintf(buf, "%u\n", MIN_SAMPLING_RATE);
 }
 
-#define define_one_ro(_name)				\
-static struct freq_attr _name =				\
+#define define_one_ro(_name)		\
+static struct freq_attr _name =		\
 __ATTR(_name, 0444, show_##_name, NULL)
 
 define_one_ro(sampling_rate_max);
@@ -174,7 +228,8 @@ static ssize_t store_sampling_down_factor(struct cpufreq_policy *unused,
 {
 	unsigned int input;
 	int ret;
-	ret = sscanf (buf, "%u", &input);
+	ret = sscanf(buf, "%u", &input);
+
 	if (ret != 1 || input > MAX_SAMPLING_DOWN_FACTOR || input < 1)
 		return -EINVAL;
 
@@ -190,15 +245,13 @@ static ssize_t store_sampling_rate(struct cpufreq_policy *unused,
 {
 	unsigned int input;
 	int ret;
-	ret = sscanf (buf, "%u", &input);
+	ret = sscanf(buf, "%u", &input);
 
-	mutex_lock(&dbs_mutex);
-	if (ret != 1 || input > MAX_SAMPLING_RATE || input < MIN_SAMPLING_RATE) {
-		mutex_unlock(&dbs_mutex);
+	if (ret != 1)
 		return -EINVAL;
-	}
 
-	dbs_tuners_ins.sampling_rate = input;
+	mutex_lock(&dbs_mutex);
+	dbs_tuners_ins.sampling_rate = max(input, minimum_sampling_rate());
 	mutex_unlock(&dbs_mutex);
 
 	return count;
@@ -209,10 +262,11 @@ static ssize_t store_up_threshold(struct cpufreq_policy *unused,
 {
 	unsigned int input;
 	int ret;
-	ret = sscanf (buf, "%u", &input);
+	ret = sscanf(buf, "%u", &input);
 
 	mutex_lock(&dbs_mutex);
-	if (ret != 1 || input > 100 || input <= dbs_tuners_ins.down_threshold) {
+	if (ret != 1 || input > 100 ||
+			input <= dbs_tuners_ins.down_threshold) {
 		mutex_unlock(&dbs_mutex);
 		return -EINVAL;
 	}
@@ -228,10 +282,12 @@ static ssize_t store_down_threshold(struct cpufreq_policy *unused,
 {
 	unsigned int input;
 	int ret;
-	ret = sscanf (buf, "%u", &input);
+	ret = sscanf(buf, "%u", &input);
 
 	mutex_lock(&dbs_mutex);
-	if (ret != 1 || input > 100 || input >= dbs_tuners_ins.up_threshold) {
+	/* cannot be lower than 11 otherwise freq will not fall */
+	if (ret != 1 || input < 11 || input > 100 ||
+			input >= dbs_tuners_ins.up_threshold) {
 		mutex_unlock(&dbs_mutex);
 		return -EINVAL;
 	}
@@ -264,12 +320,14 @@ static ssize_t store_ignore_nice_load(struct cpufreq_policy *policy,
 	}
 	dbs_tuners_ins.ignore_nice = input;
 
-	/* we need to re-evaluate prev_cpu_idle_up and prev_cpu_idle_down */
+	/* we need to re-evaluate prev_cpu_idle */
 	for_each_online_cpu(j) {
-		struct cpu_dbs_info_s *j_dbs_info;
-		j_dbs_info = &per_cpu(cpu_dbs_info, j);
-		j_dbs_info->prev_cpu_idle_up = get_cpu_idle_time(j);
-		j_dbs_info->prev_cpu_idle_down = j_dbs_info->prev_cpu_idle_up;
+		struct cpu_dbs_info_s *dbs_info;
+		dbs_info = &per_cpu(cpu_dbs_info, j);
+		dbs_info->prev_cpu_idle = get_cpu_idle_time(j,
+						&dbs_info->prev_cpu_wall);
+		if (dbs_tuners_ins.ignore_nice)
+			dbs_info->prev_cpu_nice = kstat_cpu(j).cpustat.nice;
 	}
 	mutex_unlock(&dbs_mutex);
 
@@ -281,7 +339,6 @@ static ssize_t store_freq_step(struct cpufreq_policy *policy,
 {
 	unsigned int input;
 	int ret;
-
 	ret = sscanf(buf, "%u", &input);
 
 	if (ret != 1)
@@ -310,7 +367,7 @@ define_one_rw(down_threshold);
 define_one_rw(ignore_nice_load);
 define_one_rw(freq_step);
 
-static struct attribute * dbs_attributes[] = {
+static struct attribute *dbs_attributes[] = {
 	&sampling_rate_max.attr,
 	&sampling_rate_min.attr,
 	&sampling_rate.attr,
@@ -329,55 +386,78 @@ static struct attribute_group dbs_attr_group = {
 
 /************************** sysfs end ************************/
 
-static void dbs_check_cpu(int cpu)
+static void dbs_check_cpu(struct cpu_dbs_info_s *this_dbs_info)
 {
-	unsigned int idle_ticks, up_idle_ticks, down_idle_ticks;
-	unsigned int tmp_idle_ticks, total_idle_ticks;
+	unsigned int load = 0;
 	unsigned int freq_target;
-	unsigned int freq_down_sampling_rate;
-	struct cpu_dbs_info_s *this_dbs_info = &per_cpu(cpu_dbs_info, cpu);
-	struct cpufreq_policy *policy;
 
-	if (!this_dbs_info->enable)
-		return;
+	struct cpufreq_policy *policy;
+	unsigned int j;
 
 	policy = this_dbs_info->cur_policy;
 
 	/*
-	 * The default safe range is 20% to 80%
-	 * Every sampling_rate, we check
-	 *	- If current idle time is less than 20%, then we try to
-	 *	  increase frequency
-	 * Every sampling_rate*sampling_down_factor, we check
-	 *	- If current idle time is more than 80%, then we try to
-	 *	  decrease frequency
+	 * Every sampling_rate, we check, if current idle time is less
+	 * than 20% (default), then we try to increase frequency
+	 * Every sampling_rate*sampling_down_factor, we check, if current
+	 * idle time is more than 80%, then we try to decrease frequency
 	 *
 	 * Any frequency increase takes it to the maximum frequency.
 	 * Frequency reduction happens at minimum steps of
-	 * 5% (default) of max_frequency
+	 * 5% (default) of maximum frequency
 	 */
 
-	/* Check for frequency increase */
-	idle_ticks = UINT_MAX;
+	/* Get Absolute Load */
+	for_each_cpu(j, policy->cpus) {
+		struct cpu_dbs_info_s *j_dbs_info;
+		cputime64_t cur_wall_time, cur_idle_time;
+		unsigned int idle_time, wall_time;
 
-	/* Check for frequency increase */
-	total_idle_ticks = get_cpu_idle_time(cpu);
-	tmp_idle_ticks = total_idle_ticks -
-		this_dbs_info->prev_cpu_idle_up;
-	this_dbs_info->prev_cpu_idle_up = total_idle_ticks;
+		j_dbs_info = &per_cpu(cpu_dbs_info, j);
+
+		cur_idle_time = get_cpu_idle_time(j, &cur_wall_time);
+
+		wall_time = (unsigned int) cputime64_sub(cur_wall_time,
+				j_dbs_info->prev_cpu_wall);
+		j_dbs_info->prev_cpu_wall = cur_wall_time;
+
+		idle_time = (unsigned int) cputime64_sub(cur_idle_time,
+				j_dbs_info->prev_cpu_idle);
+		j_dbs_info->prev_cpu_idle = cur_idle_time;
+
+		if (dbs_tuners_ins.ignore_nice) {
+			cputime64_t cur_nice;
+			unsigned long cur_nice_jiffies;
+
+			cur_nice = cputime64_sub(kstat_cpu(j).cpustat.nice,
+					 j_dbs_info->prev_cpu_nice);
+			/*
+			 * Assumption: nice time between sampling periods will
+			 * be less than 2^32 jiffies for 32 bit sys
+			 */
+			cur_nice_jiffies = (unsigned long)
+					cputime64_to_jiffies64(cur_nice);
 
-	if (tmp_idle_ticks < idle_ticks)
-		idle_ticks = tmp_idle_ticks;
+			j_dbs_info->prev_cpu_nice = kstat_cpu(j).cpustat.nice;
+			idle_time += jiffies_to_usecs(cur_nice_jiffies);
+		}
+
+		if (unlikely(!wall_time || wall_time < idle_time))
+			continue;
+
+		load = 100 * (wall_time - idle_time) / wall_time;
+	}
 
-	/* Scale idle ticks by 100 and compare with up and down ticks */
-	idle_ticks *= 100;
-	up_idle_ticks = (100 - dbs_tuners_ins.up_threshold) *
-			usecs_to_jiffies(dbs_tuners_ins.sampling_rate);
+	/*
+	 * break out if we 'cannot' reduce the speed as the user might
+	 * want freq_step to be zero
+	 */
+	if (dbs_tuners_ins.freq_step == 0)
+		return;
 
-	if (idle_ticks < up_idle_ticks) {
+	/* Check for frequency increase */
+	if (load > dbs_tuners_ins.up_threshold) {
 		this_dbs_info->down_skip = 0;
-		this_dbs_info->prev_cpu_idle_down =
-			this_dbs_info->prev_cpu_idle_up;
 
 		/* if we are already at full speed then break out early */
 		if (this_dbs_info->requested_freq == policy->max)
@@ -398,49 +478,24 @@ static void dbs_check_cpu(int cpu)
 		return;
 	}
 
-	/* Check for frequency decrease */
-	this_dbs_info->down_skip++;
-	if (this_dbs_info->down_skip < dbs_tuners_ins.sampling_down_factor)
-		return;
-
-	/* Check for frequency decrease */
-	total_idle_ticks = this_dbs_info->prev_cpu_idle_up;
-	tmp_idle_ticks = total_idle_ticks -
-		this_dbs_info->prev_cpu_idle_down;
-	this_dbs_info->prev_cpu_idle_down = total_idle_ticks;
-
-	if (tmp_idle_ticks < idle_ticks)
-		idle_ticks = tmp_idle_ticks;
-
-	/* Scale idle ticks by 100 and compare with up and down ticks */
-	idle_ticks *= 100;
-	this_dbs_info->down_skip = 0;
-
-	freq_down_sampling_rate = dbs_tuners_ins.sampling_rate *
-		dbs_tuners_ins.sampling_down_factor;
-	down_idle_ticks = (100 - dbs_tuners_ins.down_threshold) *
-		usecs_to_jiffies(freq_down_sampling_rate);
-
-	if (idle_ticks > down_idle_ticks) {
-		/*
-		 * if we are already at the lowest speed then break out early
-		 * or if we 'cannot' reduce the speed as the user might want
-		 * freq_target to be zero
-		 */
-		if (this_dbs_info->requested_freq == policy->min
-				|| dbs_tuners_ins.freq_step == 0)
-			return;
-
+	/*
+	 * The optimal frequency is the frequency that is the lowest that
+	 * can support the current CPU usage without triggering the up
+	 * policy. To be safe, we focus 10 points under the threshold.
+	 */
+	if (load < (dbs_tuners_ins.down_threshold - 10)) {
 		freq_target = (dbs_tuners_ins.freq_step * policy->max) / 100;
 
-		/* max freq cannot be less than 100. But who knows.... */
-		if (unlikely(freq_target == 0))
-			freq_target = 5;
-
 		this_dbs_info->requested_freq -= freq_target;
 		if (this_dbs_info->requested_freq < policy->min)
 			this_dbs_info->requested_freq = policy->min;
 
+		/*
+		 * if we cannot reduce the frequency anymore, break out early
+		 */
+		if (policy->cur == policy->min)
+			return;
+
 		__cpufreq_driver_target(policy, this_dbs_info->requested_freq,
 				CPUFREQ_RELATION_H);
 		return;
@@ -449,27 +504,45 @@ static void dbs_check_cpu(int cpu)
 
 static void do_dbs_timer(struct work_struct *work)
 {
-	int i;
-	mutex_lock(&dbs_mutex);
-	for_each_online_cpu(i)
-		dbs_check_cpu(i);
-	schedule_delayed_work(&dbs_work,
-			usecs_to_jiffies(dbs_tuners_ins.sampling_rate));
-	mutex_unlock(&dbs_mutex);
+	struct cpu_dbs_info_s *dbs_info =
+		container_of(work, struct cpu_dbs_info_s, work.work);
+	unsigned int cpu = dbs_info->cpu;
+
+	/* We want all CPUs to do sampling nearly on same jiffy */
+	int delay = usecs_to_jiffies(dbs_tuners_ins.sampling_rate);
+
+	delay -= jiffies % delay;
+
+	if (lock_policy_rwsem_write(cpu) < 0)
+		return;
+
+	if (!dbs_info->enable) {
+		unlock_policy_rwsem_write(cpu);
+		return;
+	}
+
+	dbs_check_cpu(dbs_info);
+
+	queue_delayed_work_on(cpu, kconservative_wq, &dbs_info->work, delay);
+	unlock_policy_rwsem_write(cpu);
 }
 
-static inline void dbs_timer_init(void)
+static inline void dbs_timer_init(struct cpu_dbs_info_s *dbs_info)
 {
-	init_timer_deferrable(&dbs_work.timer);
-	schedule_delayed_work(&dbs_work,
-			usecs_to_jiffies(dbs_tuners_ins.sampling_rate));
-	return;
+	/* We want all CPUs to do sampling nearly on same jiffy */
+	int delay = usecs_to_jiffies(dbs_tuners_ins.sampling_rate);
+	delay -= jiffies % delay;
+
+	dbs_info->enable = 1;
+	INIT_DELAYED_WORK_DEFERRABLE(&dbs_info->work, do_dbs_timer);
+	queue_delayed_work_on(dbs_info->cpu, kconservative_wq, &dbs_info->work,
+				delay);
 }
 
-static inline void dbs_timer_exit(void)
+static inline void dbs_timer_exit(struct cpu_dbs_info_s *dbs_info)
 {
-	cancel_delayed_work(&dbs_work);
-	return;
+	dbs_info->enable = 0;
+	cancel_delayed_work(&dbs_info->work);
 }
 
 static int cpufreq_governor_dbs(struct cpufreq_policy *policy,
@@ -503,11 +576,13 @@ static int cpufreq_governor_dbs(struct cpufreq_policy *policy,
 			j_dbs_info = &per_cpu(cpu_dbs_info, j);
 			j_dbs_info->cur_policy = policy;
 
-			j_dbs_info->prev_cpu_idle_up = get_cpu_idle_time(cpu);
-			j_dbs_info->prev_cpu_idle_down
-				= j_dbs_info->prev_cpu_idle_up;
+			j_dbs_info->prev_cpu_idle = get_cpu_idle_time(j,
+						&j_dbs_info->prev_cpu_wall);
+			if (dbs_tuners_ins.ignore_nice) {
+				j_dbs_info->prev_cpu_nice =
+						kstat_cpu(j).cpustat.nice;
+			}
 		}
-		this_dbs_info->enable = 1;
 		this_dbs_info->down_skip = 0;
 		this_dbs_info->requested_freq = policy->cur;
 
@@ -523,38 +598,36 @@ static int cpufreq_governor_dbs(struct cpufreq_policy *policy,
 			if (latency == 0)
 				latency = 1;
 
-			def_sampling_rate = 10 * latency *
-					DEF_SAMPLING_RATE_LATENCY_MULTIPLIER;
-
-			if (def_sampling_rate < MIN_STAT_SAMPLING_RATE)
-				def_sampling_rate = MIN_STAT_SAMPLING_RATE;
+			def_sampling_rate =
+				max(latency * LATENCY_MULTIPLIER,
+				    MIN_STAT_SAMPLING_RATE);
 
 			dbs_tuners_ins.sampling_rate = def_sampling_rate;
 
-			dbs_timer_init();
 			cpufreq_register_notifier(
 					&dbs_cpufreq_notifier_block,
 					CPUFREQ_TRANSITION_NOTIFIER);
 		}
+		dbs_timer_init(this_dbs_info);
 
 		mutex_unlock(&dbs_mutex);
+
 		break;
 
 	case CPUFREQ_GOV_STOP:
 		mutex_lock(&dbs_mutex);
-		this_dbs_info->enable = 0;
+		dbs_timer_exit(this_dbs_info);
 		sysfs_remove_group(&policy->kobj, &dbs_attr_group);
 		dbs_enable--;
+
 		/*
 		 * Stop the timerschedule work, when this governor
 		 * is used for first time
 		 */
-		if (dbs_enable == 0) {
-			dbs_timer_exit();
+		if (dbs_enable == 0)
 			cpufreq_unregister_notifier(
 					&dbs_cpufreq_notifier_block,
 					CPUFREQ_TRANSITION_NOTIFIER);
-		}
 
 		mutex_unlock(&dbs_mutex);
 
@@ -571,6 +644,7 @@ static int cpufreq_governor_dbs(struct cpufreq_policy *policy,
 					this_dbs_info->cur_policy,
 					policy->min, CPUFREQ_RELATION_L);
 		mutex_unlock(&dbs_mutex);
+
 		break;
 	}
 	return 0;
@@ -588,23 +662,33 @@ struct cpufreq_governor cpufreq_gov_conservative = {
 
 static int __init cpufreq_gov_dbs_init(void)
 {
-	return cpufreq_register_governor(&cpufreq_gov_conservative);
+	int err;
+
+	kconservative_wq = create_workqueue("kconservative");
+	if (!kconservative_wq) {
+		printk(KERN_ERR "Creation of kconservative failed\n");
+		return -EFAULT;
+	}
+
+	err = cpufreq_register_governor(&cpufreq_gov_conservative);
+	if (err)
+		destroy_workqueue(kconservative_wq);
+
+	return err;
 }
 
 static void __exit cpufreq_gov_dbs_exit(void)
 {
-	/* Make sure that the scheduled work is indeed not running */
-	flush_scheduled_work();
-
 	cpufreq_unregister_governor(&cpufreq_gov_conservative);
+	destroy_workqueue(kconservative_wq);
 }
 
 
-MODULE_AUTHOR ("Alexander Clouter <alex-kernel@digriz.org.uk>");
-MODULE_DESCRIPTION ("'cpufreq_conservative' - A dynamic cpufreq governor for "
+MODULE_AUTHOR("Alexander Clouter <alex@digriz.org.uk>");
+MODULE_DESCRIPTION("'cpufreq_conservative' - A dynamic cpufreq governor for "
 		"Low Latency Frequency Transition capable processors "
 		"optimised for use in a battery environment");
-MODULE_LICENSE ("GPL");
+MODULE_LICENSE("GPL");
 
 #ifdef CONFIG_CPU_FREQ_DEFAULT_GOV_CONSERVATIVE
 fs_initcall(cpufreq_gov_dbs_init);
diff --git a/drivers/cpufreq/cpufreq_ondemand.c b/drivers/cpufreq/cpufreq_ondemand.c
index 6f45b16..338f428 100644
--- a/drivers/cpufreq/cpufreq_ondemand.c
+++ b/drivers/cpufreq/cpufreq_ondemand.c
@@ -21,6 +21,7 @@
 #include <linux/hrtimer.h>
 #include <linux/tick.h>
 #include <linux/ktime.h>
+#include <linux/sched.h>
 
 /*
  * dbs is used in this file as a shortform for demandbased switching
@@ -51,8 +52,20 @@ static unsigned int def_sampling_rate;
 			(MIN_SAMPLING_RATE_RATIO * jiffies_to_usecs(10))
 #define MIN_SAMPLING_RATE			\
 			(def_sampling_rate / MIN_SAMPLING_RATE_RATIO)
+/* Above MIN_SAMPLING_RATE will vanish with its sysfs file soon
+ * Define the minimal settable sampling rate to the greater of:
+ *   - "HW transition latency" * 100 (same as default sampling / 10)
+ *   - MIN_STAT_SAMPLING_RATE
+ * To avoid that userspace shoots itself.
+*/
+static unsigned int minimum_sampling_rate(void)
+{
+	return max(def_sampling_rate / 10, MIN_STAT_SAMPLING_RATE);
+}
+
+/* This will also vanish soon with removing sampling_rate_max */
 #define MAX_SAMPLING_RATE			(500 * def_sampling_rate)
-#define DEF_SAMPLING_RATE_LATENCY_MULTIPLIER	(1000)
+#define LATENCY_MULTIPLIER			(1000)
 #define TRANSITION_LATENCY_LIMIT		(10 * 1000 * 1000)
 
 static void do_dbs_timer(struct work_struct *work);
@@ -65,14 +78,14 @@ struct cpu_dbs_info_s {
 	cputime64_t prev_cpu_wall;
 	cputime64_t prev_cpu_nice;
 	struct cpufreq_policy *cur_policy;
- 	struct delayed_work work;
+	struct delayed_work work;
 	struct cpufreq_frequency_table *freq_table;
 	unsigned int freq_lo;
 	unsigned int freq_lo_jiffies;
 	unsigned int freq_hi_jiffies;
 	int cpu;
 	unsigned int enable:1,
-	             sample_type:1;
+		sample_type:1;
 };
 static DEFINE_PER_CPU(struct cpu_dbs_info_s, cpu_dbs_info);
 
@@ -203,12 +216,28 @@ static void ondemand_powersave_bias_init(void)
 /************************** sysfs interface ************************/
 static ssize_t show_sampling_rate_max(struct cpufreq_policy *policy, char *buf)
 {
-	return sprintf (buf, "%u\n", MAX_SAMPLING_RATE);
+	static int print_once;
+
+	if (!print_once) {
+		printk(KERN_INFO "CPUFREQ: ondemand sampling_rate_max "
+		       "sysfs file is deprecated - used by: %s\n",
+		       current->comm);
+		print_once = 1;
+	}
+	return sprintf(buf, "%u\n", MAX_SAMPLING_RATE);
 }
 
 static ssize_t show_sampling_rate_min(struct cpufreq_policy *policy, char *buf)
 {
-	return sprintf (buf, "%u\n", MIN_SAMPLING_RATE);
+	static int print_once;
+
+	if (!print_once) {
+		printk(KERN_INFO "CPUFREQ: ondemand sampling_rate_min "
+		       "sysfs file is deprecated - used by: %s\n",
+		       current->comm);
+		print_once = 1;
+	}
+	return sprintf(buf, "%u\n", MIN_SAMPLING_RATE);
 }
 
 #define define_one_ro(_name)		\
@@ -238,13 +267,11 @@ static ssize_t store_sampling_rate(struct cpufreq_policy *unused,
 	ret = sscanf(buf, "%u", &input);
 
 	mutex_lock(&dbs_mutex);
-	if (ret != 1 || input > MAX_SAMPLING_RATE
-		     || input < MIN_SAMPLING_RATE) {
+	if (ret != 1) {
 		mutex_unlock(&dbs_mutex);
 		return -EINVAL;
 	}
-
-	dbs_tuners_ins.sampling_rate = input;
+	dbs_tuners_ins.sampling_rate = max(input, minimum_sampling_rate());
 	mutex_unlock(&dbs_mutex);
 
 	return count;
@@ -279,14 +306,14 @@ static ssize_t store_ignore_nice_load(struct cpufreq_policy *policy,
 	unsigned int j;
 
 	ret = sscanf(buf, "%u", &input);
-	if ( ret != 1 )
+	if (ret != 1)
 		return -EINVAL;
 
-	if ( input > 1 )
+	if (input > 1)
 		input = 1;
 
 	mutex_lock(&dbs_mutex);
-	if ( input == dbs_tuners_ins.ignore_nice ) { /* nothing to do */
+	if (input == dbs_tuners_ins.ignore_nice) { /* nothing to do */
 		mutex_unlock(&dbs_mutex);
 		return count;
 	}
@@ -337,7 +364,7 @@ define_one_rw(up_threshold);
 define_one_rw(ignore_nice_load);
 define_one_rw(powersave_bias);
 
-static struct attribute * dbs_attributes[] = {
+static struct attribute *dbs_attributes[] = {
 	&sampling_rate_max.attr,
 	&sampling_rate_min.attr,
 	&sampling_rate.attr,
@@ -512,8 +539,7 @@ static void do_dbs_timer(struct work_struct *work)
 		}
 	} else {
 		__cpufreq_driver_target(dbs_info->cur_policy,
-	                        	dbs_info->freq_lo,
-	                        	CPUFREQ_RELATION_H);
+			dbs_info->freq_lo, CPUFREQ_RELATION_H);
 	}
 	queue_delayed_work_on(cpu, kondemand_wq, &dbs_info->work, delay);
 	unlock_policy_rwsem_write(cpu);
@@ -530,7 +556,7 @@ static inline void dbs_timer_init(struct cpu_dbs_info_s *dbs_info)
 	dbs_info->sample_type = DBS_NORMAL_SAMPLE;
 	INIT_DELAYED_WORK_DEFERRABLE(&dbs_info->work, do_dbs_timer);
 	queue_delayed_work_on(dbs_info->cpu, kondemand_wq, &dbs_info->work,
-	                      delay);
+		delay);
 }
 
 static inline void dbs_timer_exit(struct cpu_dbs_info_s *dbs_info)
@@ -591,11 +617,9 @@ static int cpufreq_governor_dbs(struct cpufreq_policy *policy,
 			if (latency == 0)
 				latency = 1;
 
-			def_sampling_rate = latency *
-					DEF_SAMPLING_RATE_LATENCY_MULTIPLIER;
-
-			if (def_sampling_rate < MIN_STAT_SAMPLING_RATE)
-				def_sampling_rate = MIN_STAT_SAMPLING_RATE;
+			def_sampling_rate =
+				max(latency * LATENCY_MULTIPLIER,
+				    MIN_STAT_SAMPLING_RATE);
 
 			dbs_tuners_ins.sampling_rate = def_sampling_rate;
 		}
@@ -617,12 +641,10 @@ static int cpufreq_governor_dbs(struct cpufreq_policy *policy,
 		mutex_lock(&dbs_mutex);
 		if (policy->max < this_dbs_info->cur_policy->cur)
 			__cpufreq_driver_target(this_dbs_info->cur_policy,
-			                        policy->max,
-			                        CPUFREQ_RELATION_H);
+				policy->max, CPUFREQ_RELATION_H);
 		else if (policy->min > this_dbs_info->cur_policy->cur)
 			__cpufreq_driver_target(this_dbs_info->cur_policy,
-			                        policy->min,
-			                        CPUFREQ_RELATION_L);
+				policy->min, CPUFREQ_RELATION_L);
 		mutex_unlock(&dbs_mutex);
 		break;
 	}
@@ -677,7 +699,7 @@ static void __exit cpufreq_gov_dbs_exit(void)
 MODULE_AUTHOR("Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>");
 MODULE_AUTHOR("Alexey Starikovskiy <alexey.y.starikovskiy@intel.com>");
 MODULE_DESCRIPTION("'cpufreq_ondemand' - A dynamic cpufreq governor for "
-                   "Low Latency Frequency Transition capable processors");
+	"Low Latency Frequency Transition capable processors");
 MODULE_LICENSE("GPL");
 
 #ifdef CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND
diff --git a/drivers/cpufreq/cpufreq_stats.c b/drivers/cpufreq/cpufreq_stats.c
index c0ff97d..5a62d67 100644
--- a/drivers/cpufreq/cpufreq_stats.c
+++ b/drivers/cpufreq/cpufreq_stats.c
@@ -2,7 +2,7 @@
  *  drivers/cpufreq/cpufreq_stats.c
  *
  *  Copyright (C) 2003-2004 Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>.
- *	      (C) 2004 Zou Nan hai <nanhai.zou@intel.com>.
+ *  (C) 2004 Zou Nan hai <nanhai.zou@intel.com>.
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 as
@@ -23,7 +23,7 @@
 
 static spinlock_t cpufreq_stats_lock;
 
-#define CPUFREQ_STATDEVICE_ATTR(_name,_mode,_show) \
+#define CPUFREQ_STATDEVICE_ATTR(_name, _mode, _show) \
 static struct freq_attr _attr_##_name = {\
 	.attr = {.name = __stringify(_name), .mode = _mode, }, \
 	.show = _show,\
@@ -50,8 +50,7 @@ struct cpufreq_stats_attribute {
 	ssize_t(*show) (struct cpufreq_stats *, char *);
 };
 
-static int
-cpufreq_stats_update (unsigned int cpu)
+static int cpufreq_stats_update(unsigned int cpu)
 {
 	struct cpufreq_stats *stat;
 	unsigned long long cur_time;
@@ -68,8 +67,7 @@ cpufreq_stats_update (unsigned int cpu)
 	return 0;
 }
 
-static ssize_t
-show_total_trans(struct cpufreq_policy *policy, char *buf)
+static ssize_t show_total_trans(struct cpufreq_policy *policy, char *buf)
 {
 	struct cpufreq_stats *stat = per_cpu(cpufreq_stats_table, policy->cpu);
 	if (!stat)
@@ -78,8 +76,7 @@ show_total_trans(struct cpufreq_policy *policy, char *buf)
 			per_cpu(cpufreq_stats_table, stat->cpu)->total_trans);
 }
 
-static ssize_t
-show_time_in_state(struct cpufreq_policy *policy, char *buf)
+static ssize_t show_time_in_state(struct cpufreq_policy *policy, char *buf)
 {
 	ssize_t len = 0;
 	int i;
@@ -89,14 +86,14 @@ show_time_in_state(struct cpufreq_policy *policy, char *buf)
 	cpufreq_stats_update(stat->cpu);
 	for (i = 0; i < stat->state_num; i++) {
 		len += sprintf(buf + len, "%u %llu\n", stat->freq_table[i],
-			(unsigned long long)cputime64_to_clock_t(stat->time_in_state[i]));
+			(unsigned long long)
+			cputime64_to_clock_t(stat->time_in_state[i]));
 	}
 	return len;
 }
 
 #ifdef CONFIG_CPU_FREQ_STAT_DETAILS
-static ssize_t
-show_trans_table(struct cpufreq_policy *policy, char *buf)
+static ssize_t show_trans_table(struct cpufreq_policy *policy, char *buf)
 {
 	ssize_t len = 0;
 	int i, j;
@@ -139,11 +136,11 @@ show_trans_table(struct cpufreq_policy *policy, char *buf)
 		return PAGE_SIZE;
 	return len;
 }
-CPUFREQ_STATDEVICE_ATTR(trans_table,0444,show_trans_table);
+CPUFREQ_STATDEVICE_ATTR(trans_table, 0444, show_trans_table);
 #endif
 
-CPUFREQ_STATDEVICE_ATTR(total_trans,0444,show_total_trans);
-CPUFREQ_STATDEVICE_ATTR(time_in_state,0444,show_time_in_state);
+CPUFREQ_STATDEVICE_ATTR(total_trans, 0444, show_total_trans);
+CPUFREQ_STATDEVICE_ATTR(time_in_state, 0444, show_time_in_state);
 
 static struct attribute *default_attrs[] = {
 	&_attr_total_trans.attr,
@@ -158,8 +155,7 @@ static struct attribute_group stats_attr_group = {
 	.name = "stats"
 };
 
-static int
-freq_table_get_index(struct cpufreq_stats *stat, unsigned int freq)
+static int freq_table_get_index(struct cpufreq_stats *stat, unsigned int freq)
 {
 	int index;
 	for (index = 0; index < stat->max_state; index++)
@@ -183,8 +179,7 @@ static void cpufreq_stats_free_table(unsigned int cpu)
 		cpufreq_cpu_put(policy);
 }
 
-static int
-cpufreq_stats_create_table (struct cpufreq_policy *policy,
+static int cpufreq_stats_create_table(struct cpufreq_policy *policy,
 		struct cpufreq_frequency_table *table)
 {
 	unsigned int i, j, count = 0, ret = 0;
@@ -194,7 +189,8 @@ cpufreq_stats_create_table (struct cpufreq_policy *policy,
 	unsigned int cpu = policy->cpu;
 	if (per_cpu(cpufreq_stats_table, cpu))
 		return -EBUSY;
-	if ((stat = kzalloc(sizeof(struct cpufreq_stats), GFP_KERNEL)) == NULL)
+	stat = kzalloc(sizeof(struct cpufreq_stats), GFP_KERNEL);
+	if ((stat) == NULL)
 		return -ENOMEM;
 
 	data = cpufreq_cpu_get(cpu);
@@ -203,13 +199,14 @@ cpufreq_stats_create_table (struct cpufreq_policy *policy,
 		goto error_get_fail;
 	}
 
-	if ((ret = sysfs_create_group(&data->kobj, &stats_attr_group)))
+	ret = sysfs_create_group(&data->kobj, &stats_attr_group);
+	if (ret)
 		goto error_out;
 
 	stat->cpu = cpu;
 	per_cpu(cpufreq_stats_table, cpu) = stat;
 
-	for (i=0; table[i].frequency != CPUFREQ_TABLE_END; i++) {
+	for (i = 0; table[i].frequency != CPUFREQ_TABLE_END; i++) {
 		unsigned int freq = table[i].frequency;
 		if (freq == CPUFREQ_ENTRY_INVALID)
 			continue;
@@ -255,9 +252,8 @@ error_get_fail:
 	return ret;
 }
 
-static int
-cpufreq_stat_notifier_policy (struct notifier_block *nb, unsigned long val,
-		void *data)
+static int cpufreq_stat_notifier_policy(struct notifier_block *nb,
+		unsigned long val, void *data)
 {
 	int ret;
 	struct cpufreq_policy *policy = data;
@@ -268,14 +264,14 @@ cpufreq_stat_notifier_policy (struct notifier_block *nb, unsigned long val,
 	table = cpufreq_frequency_get_table(cpu);
 	if (!table)
 		return 0;
-	if ((ret = cpufreq_stats_create_table(policy, table)))
+	ret = cpufreq_stats_create_table(policy, table);
+	if (ret)
 		return ret;
 	return 0;
 }
 
-static int
-cpufreq_stat_notifier_trans (struct notifier_block *nb, unsigned long val,
-		void *data)
+static int cpufreq_stat_notifier_trans(struct notifier_block *nb,
+		unsigned long val, void *data)
 {
 	struct cpufreq_freqs *freq = data;
 	struct cpufreq_stats *stat;
@@ -340,19 +336,20 @@ static struct notifier_block notifier_trans_block = {
 	.notifier_call = cpufreq_stat_notifier_trans
 };
 
-static int
-__init cpufreq_stats_init(void)
+static int __init cpufreq_stats_init(void)
 {
 	int ret;
 	unsigned int cpu;
 
 	spin_lock_init(&cpufreq_stats_lock);
-	if ((ret = cpufreq_register_notifier(&notifier_policy_block,
-				CPUFREQ_POLICY_NOTIFIER)))
+	ret = cpufreq_register_notifier(&notifier_policy_block,
+				CPUFREQ_POLICY_NOTIFIER);
+	if (ret)
 		return ret;
 
-	if ((ret = cpufreq_register_notifier(&notifier_trans_block,
-				CPUFREQ_TRANSITION_NOTIFIER))) {
+	ret = cpufreq_register_notifier(&notifier_trans_block,
+				CPUFREQ_TRANSITION_NOTIFIER);
+	if (ret) {
 		cpufreq_unregister_notifier(&notifier_policy_block,
 				CPUFREQ_POLICY_NOTIFIER);
 		return ret;
@@ -364,8 +361,7 @@ __init cpufreq_stats_init(void)
 	}
 	return 0;
 }
-static void
-__exit cpufreq_stats_exit(void)
+static void __exit cpufreq_stats_exit(void)
 {
 	unsigned int cpu;
 
@@ -379,10 +375,10 @@ __exit cpufreq_stats_exit(void)
 	}
 }
 
-MODULE_AUTHOR ("Zou Nan hai <nanhai.zou@intel.com>");
-MODULE_DESCRIPTION ("'cpufreq_stats' - A driver to export cpufreq stats "
+MODULE_AUTHOR("Zou Nan hai <nanhai.zou@intel.com>");
+MODULE_DESCRIPTION("'cpufreq_stats' - A driver to export cpufreq stats "
 				"through sysfs filesystem");
-MODULE_LICENSE ("GPL");
+MODULE_LICENSE("GPL");
 
 module_init(cpufreq_stats_init);
 module_exit(cpufreq_stats_exit);
diff --git a/drivers/cpufreq/cpufreq_userspace.c b/drivers/cpufreq/cpufreq_userspace.c
index 1442bba..66d2d1d 100644
--- a/drivers/cpufreq/cpufreq_userspace.c
+++ b/drivers/cpufreq/cpufreq_userspace.c
@@ -24,9 +24,6 @@
 #include <linux/sysfs.h>
 #include <linux/mutex.h>
 
-#include <asm/uaccess.h>
-
-
 /**
  * A few values needed by the userspace governor
  */
@@ -37,7 +34,7 @@ static DEFINE_PER_CPU(unsigned int, cpu_set_freq); /* CPU freq desired by
 							userspace */
 static DEFINE_PER_CPU(unsigned int, cpu_is_managed);
 
-static DEFINE_MUTEX	(userspace_mutex);
+static DEFINE_MUTEX(userspace_mutex);
 static int cpus_using_userspace_governor;
 
 #define dprintk(msg...) \
@@ -46,9 +43,9 @@ static int cpus_using_userspace_governor;
 /* keep track of frequency transitions */
 static int
 userspace_cpufreq_notifier(struct notifier_block *nb, unsigned long val,
-                       void *data)
+	void *data)
 {
-        struct cpufreq_freqs *freq = data;
+	struct cpufreq_freqs *freq = data;
 
 	if (!per_cpu(cpu_is_managed, freq->cpu))
 		return 0;
@@ -57,11 +54,11 @@ userspace_cpufreq_notifier(struct notifier_block *nb, unsigned long val,
 			freq->cpu, freq->new);
 	per_cpu(cpu_cur_freq, freq->cpu) = freq->new;
 
-        return 0;
+	return 0;
 }
 
 static struct notifier_block userspace_cpufreq_notifier_block = {
-        .notifier_call  = userspace_cpufreq_notifier
+	.notifier_call  = userspace_cpufreq_notifier
 };
 
 
@@ -93,8 +90,11 @@ static int cpufreq_set(struct cpufreq_policy *policy, unsigned int freq)
 	 * We're safe from concurrent calls to ->target() here
 	 * as we hold the userspace_mutex lock. If we were calling
 	 * cpufreq_driver_target, a deadlock situation might occur:
-	 * A: cpufreq_set (lock userspace_mutex) -> cpufreq_driver_target(lock policy->lock)
-	 * B: cpufreq_set_policy(lock policy->lock) -> __cpufreq_governor -> cpufreq_governor_userspace (lock userspace_mutex)
+	 * A: cpufreq_set (lock userspace_mutex) ->
+	 *      cpufreq_driver_target(lock policy->lock)
+	 * B: cpufreq_set_policy(lock policy->lock) ->
+	 *      __cpufreq_governor ->
+	 *         cpufreq_governor_userspace (lock userspace_mutex)
 	 */
 	ret = __cpufreq_driver_target(policy, freq, CPUFREQ_RELATION_L);
 
@@ -210,9 +210,10 @@ static void __exit cpufreq_gov_userspace_exit(void)
 }
 
 
-MODULE_AUTHOR ("Dominik Brodowski <linux@brodo.de>, Russell King <rmk@arm.linux.org.uk>");
-MODULE_DESCRIPTION ("CPUfreq policy governor 'userspace'");
-MODULE_LICENSE ("GPL");
+MODULE_AUTHOR("Dominik Brodowski <linux@brodo.de>, "
+		"Russell King <rmk@arm.linux.org.uk>");
+MODULE_DESCRIPTION("CPUfreq policy governor 'userspace'");
+MODULE_LICENSE("GPL");
 
 #ifdef CONFIG_CPU_FREQ_DEFAULT_GOV_USERSPACE
 fs_initcall(cpufreq_gov_userspace_init);
diff --git a/drivers/cpufreq/freq_table.c b/drivers/cpufreq/freq_table.c
index 9071d80..a9bd3a0 100644
--- a/drivers/cpufreq/freq_table.c
+++ b/drivers/cpufreq/freq_table.c
@@ -28,7 +28,7 @@ int cpufreq_frequency_table_cpuinfo(struct cpufreq_policy *policy,
 	unsigned int max_freq = 0;
 	unsigned int i;
 
-	for (i=0; (table[i].frequency != CPUFREQ_TABLE_END); i++) {
+	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);
@@ -70,7 +70,7 @@ int cpufreq_frequency_table_verify(struct cpufreq_policy *policy,
 	cpufreq_verify_within_limits(policy, policy->cpuinfo.min_freq,
 				     policy->cpuinfo.max_freq);
 
-	for (i=0; (table[i].frequency != CPUFREQ_TABLE_END); i++) {
+	for (i = 0; (table[i].frequency != CPUFREQ_TABLE_END); i++) {
 		unsigned int freq = table[i].frequency;
 		if (freq == CPUFREQ_ENTRY_INVALID)
 			continue;
@@ -125,13 +125,13 @@ int cpufreq_frequency_table_target(struct cpufreq_policy *policy,
 	if (!cpu_online(policy->cpu))
 		return -EINVAL;
 
-	for (i=0; (table[i].frequency != CPUFREQ_TABLE_END); i++) {
+	for (i = 0; (table[i].frequency != CPUFREQ_TABLE_END); i++) {
 		unsigned int freq = table[i].frequency;
 		if (freq == CPUFREQ_ENTRY_INVALID)
 			continue;
 		if ((freq < policy->min) || (freq > policy->max))
 			continue;
-		switch(relation) {
+		switch (relation) {
 		case CPUFREQ_RELATION_H:
 			if (freq <= target_freq) {
 				if (freq >= optimal.frequency) {
@@ -178,7 +178,7 @@ static DEFINE_PER_CPU(struct cpufreq_frequency_table *, show_table);
 /**
  * show_available_freqs - show available frequencies for the specified CPU
  */
-static ssize_t show_available_freqs (struct cpufreq_policy *policy, char *buf)
+static ssize_t show_available_freqs(struct cpufreq_policy *policy, char *buf)
 {
 	unsigned int i = 0;
 	unsigned int cpu = policy->cpu;
@@ -190,7 +190,7 @@ static ssize_t show_available_freqs (struct cpufreq_policy *policy, char *buf)
 
 	table = per_cpu(show_table, cpu);
 
-	for (i=0; (table[i].frequency != CPUFREQ_TABLE_END); i++) {
+	for (i = 0; (table[i].frequency != CPUFREQ_TABLE_END); i++) {
 		if (table[i].frequency == CPUFREQ_ENTRY_INVALID)
 			continue;
 		count += sprintf(&buf[count], "%d ", table[i].frequency);
@@ -234,6 +234,6 @@ struct cpufreq_frequency_table *cpufreq_frequency_get_table(unsigned int cpu)
 }
 EXPORT_SYMBOL_GPL(cpufreq_frequency_get_table);
 
-MODULE_AUTHOR ("Dominik Brodowski <linux@brodo.de>");
-MODULE_DESCRIPTION ("CPUfreq frequency table helpers");
-MODULE_LICENSE ("GPL");
+MODULE_AUTHOR("Dominik Brodowski <linux@brodo.de>");
+MODULE_DESCRIPTION("CPUfreq frequency table helpers");
+MODULE_LICENSE("GPL");