Merge master.kernel.org:/pub/scm/linux/kernel/git/davej/cpufreq

arch/i386/kernel/cpu/cpufreq/Kconfig

@@ -96,6 +96,7 @@ config X86_POWERNOW_K8_ACPI
 
 config X86_GX_SUSPMOD
 	tristate "Cyrix MediaGX/NatSemi Geode Suspend Modulation"
+	depends on PCI
 	help
 	 This add the CPUFreq driver for NatSemi Geode processors which
 	 support suspend modulation.

arch/i386/kernel/cpu/cpufreq/p4-clockmod.c

@@ -52,6 +52,7 @@ enum {
 
 
 static int has_N44_O17_errata[NR_CPUS];
+static int has_N60_errata[NR_CPUS];
 static unsigned int stock_freq;
 static struct cpufreq_driver p4clockmod_driver;
 static unsigned int cpufreq_p4_get(unsigned int cpu);
@@ -226,6 +227,12 @@ static int cpufreq_p4_cpu_init(struct cpufreq_policy *policy)
 	case 0x0f12:
 		has_N44_O17_errata[policy->cpu] = 1;
 		dprintk("has errata -- disabling low frequencies\n");
+		break;
+
+	case 0x0f29:
+		has_N60_errata[policy->cpu] = 1;
+		dprintk("has errata -- disabling frequencies lower than 2ghz\n");
+		break;
 	}
 	
 	/* get max frequency */
@@ -237,6 +244,8 @@ static int cpufreq_p4_cpu_init(struct cpufreq_policy *policy)
 	for (i=1; (p4clockmod_table[i].frequency != CPUFREQ_TABLE_END); i++) {
 		if ((i<2) && (has_N44_O17_errata[policy->cpu]))
 			p4clockmod_table[i].frequency = CPUFREQ_ENTRY_INVALID;
+		else if (has_N60_errata[policy->cpu] && p4clockmod_table[i].frequency < 2000000)
+			p4clockmod_table[i].frequency = CPUFREQ_ENTRY_INVALID;
 		else
 			p4clockmod_table[i].frequency = (stock_freq * i)/8;
 	}

drivers/cpufreq/cpufreq.c

@@ -26,6 +26,7 @@
 #include <linux/slab.h>
 #include <linux/cpu.h>
 #include <linux/completion.h>
+#include <linux/mutex.h>
 
 #define dprintk(msg...) cpufreq_debug_printk(CPUFREQ_DEBUG_CORE, "cpufreq-core", msg)
 
@@ -55,7 +56,7 @@ static DECLARE_RWSEM		(cpufreq_notifier_rwsem);
 
 
 static LIST_HEAD(cpufreq_governor_list);
-static DECLARE_MUTEX		(cpufreq_governor_sem);
+static DEFINE_MUTEX		(cpufreq_governor_mutex);
 
 struct cpufreq_policy * cpufreq_cpu_get(unsigned int cpu)
 {
@@ -297,18 +298,18 @@ static int cpufreq_parse_governor (char *str_governor, unsigned int *policy,
 		return -EINVAL;
 	} else {
 		struct cpufreq_governor *t;
-		down(&cpufreq_governor_sem);
+		mutex_lock(&cpufreq_governor_mutex);
 		if (!cpufreq_driver || !cpufreq_driver->target)
 			goto out;
 		list_for_each_entry(t, &cpufreq_governor_list, governor_list) {
 			if (!strnicmp(str_governor,t->name,CPUFREQ_NAME_LEN)) {
 				*governor = t;
-				up(&cpufreq_governor_sem);
+				mutex_unlock(&cpufreq_governor_mutex);
 				return 0;
 			}
 		}
 	out:
-		up(&cpufreq_governor_sem);
+		mutex_unlock(&cpufreq_governor_mutex);
 	}
 	return -EINVAL;
 }
@@ -600,7 +601,8 @@ static int cpufreq_add_dev (struct sys_device * sys_dev)
 	policy->cpu = cpu;
 	policy->cpus = cpumask_of_cpu(cpu);
 
-	init_MUTEX_LOCKED(&policy->lock);
+	mutex_init(&policy->lock);
+	mutex_lock(&policy->lock);
 	init_completion(&policy->kobj_unregister);
 	INIT_WORK(&policy->update, handle_update, (void *)(long)cpu);
 
@@ -610,6 +612,7 @@ static int cpufreq_add_dev (struct sys_device * sys_dev)
 	ret = cpufreq_driver->init(policy);
 	if (ret) {
 		dprintk("initialization failed\n");
+		mutex_unlock(&policy->lock);
 		goto err_out;
 	}
 
@@ -621,9 +624,10 @@ static int cpufreq_add_dev (struct sys_device * sys_dev)
 	strlcpy(policy->kobj.name, "cpufreq", KOBJ_NAME_LEN);
 
 	ret = kobject_register(&policy->kobj);
-	if (ret)
+	if (ret) {
+		mutex_unlock(&policy->lock);
 		goto err_out_driver_exit;
-
+	}
 	/* set up files for this cpu device */
 	drv_attr = cpufreq_driver->attr;
 	while ((drv_attr) && (*drv_attr)) {
@@ -641,7 +645,7 @@ static int cpufreq_add_dev (struct sys_device * sys_dev)
 	spin_unlock_irqrestore(&cpufreq_driver_lock, flags);
 	policy->governor = NULL; /* to assure that the starting sequence is
 				  * run in cpufreq_set_policy */
-	up(&policy->lock);
+	mutex_unlock(&policy->lock);
 	
 	/* set default policy */
 	
@@ -762,10 +766,10 @@ static int cpufreq_remove_dev (struct sys_device * sys_dev)
 	spin_unlock_irqrestore(&cpufreq_driver_lock, flags);
 #endif
 
-	down(&data->lock);
+	mutex_lock(&data->lock);
 	if (cpufreq_driver->target)
 		__cpufreq_governor(data, CPUFREQ_GOV_STOP);
-	up(&data->lock);
+	mutex_unlock(&data->lock);
 
 	kobject_unregister(&data->kobj);
 
@@ -834,9 +838,9 @@ unsigned int cpufreq_quick_get(unsigned int cpu)
 	unsigned int ret = 0;
 
 	if (policy) {
-		down(&policy->lock);
+		mutex_lock(&policy->lock);
 		ret = policy->cur;
-		up(&policy->lock);
+		mutex_unlock(&policy->lock);
 		cpufreq_cpu_put(policy);
 	}
 
@@ -862,7 +866,7 @@ unsigned int cpufreq_get(unsigned int cpu)
 	if (!cpufreq_driver->get)
 		goto out;
 
-	down(&policy->lock);
+	mutex_lock(&policy->lock);
 
 	ret = cpufreq_driver->get(cpu);
 
@@ -875,7 +879,7 @@ unsigned int cpufreq_get(unsigned int cpu)
 		}
 	}
 
-	up(&policy->lock);
+	mutex_unlock(&policy->lock);
 
  out:
 	cpufreq_cpu_put(policy);
@@ -1158,11 +1162,11 @@ int cpufreq_driver_target(struct cpufreq_policy *policy,
 	if (!policy)
 		return -EINVAL;
 
-	down(&policy->lock);
+	mutex_lock(&policy->lock);
 
 	ret = __cpufreq_driver_target(policy, target_freq, relation);
 
-	up(&policy->lock);
+	mutex_unlock(&policy->lock);
 
 	cpufreq_cpu_put(policy);
 
@@ -1199,9 +1203,9 @@ int cpufreq_governor(unsigned int cpu, unsigned int event)
 	if (!policy)
 		return -EINVAL;
 
-	down(&policy->lock);
+	mutex_lock(&policy->lock);
 	ret = __cpufreq_governor(policy, event);
-	up(&policy->lock);
+	mutex_unlock(&policy->lock);
 
 	cpufreq_cpu_put(policy);
 
@@ -1217,17 +1221,17 @@ int cpufreq_register_governor(struct cpufreq_governor *governor)
 	if (!governor)
 		return -EINVAL;
 
-	down(&cpufreq_governor_sem);
+	mutex_lock(&cpufreq_governor_mutex);
 	
 	list_for_each_entry(t, &cpufreq_governor_list, governor_list) {
 		if (!strnicmp(governor->name,t->name,CPUFREQ_NAME_LEN)) {
-			up(&cpufreq_governor_sem);
+			mutex_unlock(&cpufreq_governor_mutex);
 			return -EBUSY;
 		}
 	}
 	list_add(&governor->governor_list, &cpufreq_governor_list);
 
- 	up(&cpufreq_governor_sem);
+ 	mutex_unlock(&cpufreq_governor_mutex);
 
 	return 0;
 }
@@ -1239,9 +1243,9 @@ void cpufreq_unregister_governor(struct cpufreq_governor *governor)
 	if (!governor)
 		return;
 
-	down(&cpufreq_governor_sem);
+	mutex_lock(&cpufreq_governor_mutex);
 	list_del(&governor->governor_list);
-	up(&cpufreq_governor_sem);
+	mutex_unlock(&cpufreq_governor_mutex);
 	return;
 }
 EXPORT_SYMBOL_GPL(cpufreq_unregister_governor);
@@ -1268,9 +1272,9 @@ int cpufreq_get_policy(struct cpufreq_policy *policy, unsigned int cpu)
 	if (!cpu_policy)
 		return -EINVAL;
 
-	down(&cpu_policy->lock);
+	mutex_lock(&cpu_policy->lock);
 	memcpy(policy, cpu_policy, sizeof(struct cpufreq_policy));
-	up(&cpu_policy->lock);
+	mutex_unlock(&cpu_policy->lock);
 
 	cpufreq_cpu_put(cpu_policy);
 
@@ -1382,7 +1386,7 @@ int cpufreq_set_policy(struct cpufreq_policy *policy)
 		return -EINVAL;
 
 	/* lock this CPU */
-	down(&data->lock);
+	mutex_lock(&data->lock);
 
 	ret = __cpufreq_set_policy(data, policy);
 	data->user_policy.min = data->min;
@@ -1390,7 +1394,7 @@ int cpufreq_set_policy(struct cpufreq_policy *policy)
 	data->user_policy.policy = data->policy;
 	data->user_policy.governor = data->governor;
 
-	up(&data->lock);
+	mutex_unlock(&data->lock);
 	cpufreq_cpu_put(data);
 
 	return ret;
@@ -1414,7 +1418,7 @@ int cpufreq_update_policy(unsigned int cpu)
 	if (!data)
 		return -ENODEV;
 
-	down(&data->lock);
+	mutex_lock(&data->lock);
 
 	dprintk("updating policy for CPU %u\n", cpu);
 	memcpy(&policy, 
@@ -1425,9 +1429,17 @@ int cpufreq_update_policy(unsigned int cpu)
 	policy.policy = data->user_policy.policy;
 	policy.governor = data->user_policy.governor;
 
+	/* BIOS might change freq behind our back
+	  -> ask driver for current freq and notify governors about a change */
+	if (cpufreq_driver->get) {
+		policy.cur = cpufreq_driver->get(cpu);
+		if (data->cur != policy.cur)
+			cpufreq_out_of_sync(cpu, data->cur, policy.cur);
+	}
+
 	ret = __cpufreq_set_policy(data, &policy);
 
-	up(&data->lock);
+	mutex_unlock(&data->lock);
 
 	cpufreq_cpu_put(data);
 	return ret;

drivers/cpufreq/cpufreq_conservative.c

@@ -28,7 +28,7 @@
 #include <linux/jiffies.h>
 #include <linux/kernel_stat.h>
 #include <linux/percpu.h>
-
+#include <linux/mutex.h>
 /*
  * dbs is used in this file as a shortform for demandbased switching
  * It helps to keep variable names smaller, simpler
@@ -71,7 +71,7 @@ static DEFINE_PER_CPU(struct cpu_dbs_info_s, cpu_dbs_info);
 
 static unsigned int dbs_enable;	/* number of CPUs using this policy */
 
-static DECLARE_MUTEX 	(dbs_sem);
+static DEFINE_MUTEX 	(dbs_mutex);
 static DECLARE_WORK	(dbs_work, do_dbs_timer, NULL);
 
 struct dbs_tuners {
@@ -139,9 +139,9 @@ static ssize_t store_sampling_down_factor(struct cpufreq_policy *unused,
 	if (ret != 1 )
 		return -EINVAL;
 
-	down(&dbs_sem);
+	mutex_lock(&dbs_mutex);
 	dbs_tuners_ins.sampling_down_factor = input;
-	up(&dbs_sem);
+	mutex_unlock(&dbs_mutex);
 
 	return count;
 }
@@ -153,14 +153,14 @@ static ssize_t store_sampling_rate(struct cpufreq_policy *unused,
 	int ret;
 	ret = sscanf (buf, "%u", &input);
 
-	down(&dbs_sem);
+	mutex_lock(&dbs_mutex);
 	if (ret != 1 || input > MAX_SAMPLING_RATE || input < MIN_SAMPLING_RATE) {
-		up(&dbs_sem);
+		mutex_unlock(&dbs_mutex);
 		return -EINVAL;
 	}
 
 	dbs_tuners_ins.sampling_rate = input;
-	up(&dbs_sem);
+	mutex_unlock(&dbs_mutex);
 
 	return count;
 }
@@ -172,16 +172,16 @@ static ssize_t store_up_threshold(struct cpufreq_policy *unused,
 	int ret;
 	ret = sscanf (buf, "%u", &input);
 
-	down(&dbs_sem);
+	mutex_lock(&dbs_mutex);
 	if (ret != 1 || input > MAX_FREQUENCY_UP_THRESHOLD || 
 			input < MIN_FREQUENCY_UP_THRESHOLD ||
 			input <= dbs_tuners_ins.down_threshold) {
-		up(&dbs_sem);
+		mutex_unlock(&dbs_mutex);
 		return -EINVAL;
 	}
 
 	dbs_tuners_ins.up_threshold = input;
-	up(&dbs_sem);
+	mutex_unlock(&dbs_mutex);
 
 	return count;
 }
@@ -193,16 +193,16 @@ static ssize_t store_down_threshold(struct cpufreq_policy *unused,
 	int ret;
 	ret = sscanf (buf, "%u", &input);
 
-	down(&dbs_sem);
+	mutex_lock(&dbs_mutex);
 	if (ret != 1 || input > MAX_FREQUENCY_DOWN_THRESHOLD || 
 			input < MIN_FREQUENCY_DOWN_THRESHOLD ||
 			input >= dbs_tuners_ins.up_threshold) {
-		up(&dbs_sem);
+		mutex_unlock(&dbs_mutex);
 		return -EINVAL;
 	}
 
 	dbs_tuners_ins.down_threshold = input;
-	up(&dbs_sem);
+	mutex_unlock(&dbs_mutex);
 
 	return count;
 }
@@ -222,9 +222,9 @@ static ssize_t store_ignore_nice_load(struct cpufreq_policy *policy,
 	if ( input > 1 )
 		input = 1;
 	
-	down(&dbs_sem);
+	mutex_lock(&dbs_mutex);
 	if ( input == dbs_tuners_ins.ignore_nice ) { /* nothing to do */
-		up(&dbs_sem);
+		mutex_unlock(&dbs_mutex);
 		return count;
 	}
 	dbs_tuners_ins.ignore_nice = input;
@@ -236,7 +236,7 @@ static ssize_t store_ignore_nice_load(struct cpufreq_policy *policy,
 		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;
 	}
-	up(&dbs_sem);
+	mutex_unlock(&dbs_mutex);
 
 	return count;
 }
@@ -257,9 +257,9 @@ static ssize_t store_freq_step(struct cpufreq_policy *policy,
 	
 	/* no need to test here if freq_step is zero as the user might actually
 	 * want this, they would be crazy though :) */
-	down(&dbs_sem);
+	mutex_lock(&dbs_mutex);
 	dbs_tuners_ins.freq_step = input;
-	up(&dbs_sem);
+	mutex_unlock(&dbs_mutex);
 
 	return count;
 }
@@ -444,12 +444,12 @@ static void dbs_check_cpu(int cpu)
 static void do_dbs_timer(void *data)
 { 
 	int i;
-	down(&dbs_sem);
+	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));
-	up(&dbs_sem);
+	mutex_unlock(&dbs_mutex);
 } 
 
 static inline void dbs_timer_init(void)
@@ -487,7 +487,7 @@ static int cpufreq_governor_dbs(struct cpufreq_policy *policy,
 		if (this_dbs_info->enable) /* Already enabled */
 			break;
 		 
-		down(&dbs_sem);
+		mutex_lock(&dbs_mutex);
 		for_each_cpu_mask(j, policy->cpus) {
 			struct cpu_dbs_info_s *j_dbs_info;
 			j_dbs_info = &per_cpu(cpu_dbs_info, j);
@@ -521,11 +521,11 @@ static int cpufreq_governor_dbs(struct cpufreq_policy *policy,
 			dbs_timer_init();
 		}
 		
-		up(&dbs_sem);
+		mutex_unlock(&dbs_mutex);
 		break;
 
 	case CPUFREQ_GOV_STOP:
-		down(&dbs_sem);
+		mutex_lock(&dbs_mutex);
 		this_dbs_info->enable = 0;
 		sysfs_remove_group(&policy->kobj, &dbs_attr_group);
 		dbs_enable--;
@@ -536,12 +536,12 @@ static int cpufreq_governor_dbs(struct cpufreq_policy *policy,
 		if (dbs_enable == 0) 
 			dbs_timer_exit();
 		
-		up(&dbs_sem);
+		mutex_unlock(&dbs_mutex);
 
 		break;
 
 	case CPUFREQ_GOV_LIMITS:
-		down(&dbs_sem);
+		mutex_lock(&dbs_mutex);
 		if (policy->max < this_dbs_info->cur_policy->cur)
 			__cpufreq_driver_target(
 					this_dbs_info->cur_policy,
@@ -550,7 +550,7 @@ static int cpufreq_governor_dbs(struct cpufreq_policy *policy,
 			__cpufreq_driver_target(
 					this_dbs_info->cur_policy,
 				       	policy->min, CPUFREQ_RELATION_L);
-		up(&dbs_sem);
+		mutex_unlock(&dbs_mutex);
 		break;
 	}
 	return 0;

drivers/cpufreq/cpufreq_ondemand.c

@@ -27,6 +27,7 @@
 #include <linux/jiffies.h>
 #include <linux/kernel_stat.h>
 #include <linux/percpu.h>
+#include <linux/mutex.h>
 
 /*
  * dbs is used in this file as a shortform for demandbased switching
@@ -70,7 +71,7 @@ static DEFINE_PER_CPU(struct cpu_dbs_info_s, cpu_dbs_info);
 
 static unsigned int dbs_enable;	/* number of CPUs using this policy */
 
-static DECLARE_MUTEX 	(dbs_sem);
+static DEFINE_MUTEX 	(dbs_mutex);
 static DECLARE_WORK	(dbs_work, do_dbs_timer, NULL);
 
 struct dbs_tuners {
@@ -136,9 +137,9 @@ static ssize_t store_sampling_down_factor(struct cpufreq_policy *unused,
 	if (input > MAX_SAMPLING_DOWN_FACTOR || input < 1)
 		return -EINVAL;
 
-	down(&dbs_sem);
+	mutex_lock(&dbs_mutex);
 	dbs_tuners_ins.sampling_down_factor = input;
-	up(&dbs_sem);
+	mutex_unlock(&dbs_mutex);
 
 	return count;
 }
@@ -150,14 +151,14 @@ static ssize_t store_sampling_rate(struct cpufreq_policy *unused,
 	int ret;
 	ret = sscanf (buf, "%u", &input);
 
-	down(&dbs_sem);
+	mutex_lock(&dbs_mutex);
 	if (ret != 1 || input > MAX_SAMPLING_RATE || input < MIN_SAMPLING_RATE) {
-		up(&dbs_sem);
+		mutex_unlock(&dbs_mutex);
 		return -EINVAL;
 	}
 
 	dbs_tuners_ins.sampling_rate = input;
-	up(&dbs_sem);
+	mutex_unlock(&dbs_mutex);
 
 	return count;
 }
@@ -169,15 +170,15 @@ static ssize_t store_up_threshold(struct cpufreq_policy *unused,
 	int ret;
 	ret = sscanf (buf, "%u", &input);
 
-	down(&dbs_sem);
+	mutex_lock(&dbs_mutex);
 	if (ret != 1 || input > MAX_FREQUENCY_UP_THRESHOLD || 
 			input < MIN_FREQUENCY_UP_THRESHOLD) {
-		up(&dbs_sem);
+		mutex_unlock(&dbs_mutex);
 		return -EINVAL;
 	}
 
 	dbs_tuners_ins.up_threshold = input;
-	up(&dbs_sem);
+	mutex_unlock(&dbs_mutex);
 
 	return count;
 }
@@ -197,9 +198,9 @@ static ssize_t store_ignore_nice_load(struct cpufreq_policy *policy,
 	if ( input > 1 )
 		input = 1;
 	
-	down(&dbs_sem);
+	mutex_lock(&dbs_mutex);
 	if ( input == dbs_tuners_ins.ignore_nice ) { /* nothing to do */
-		up(&dbs_sem);
+		mutex_unlock(&dbs_mutex);
 		return count;
 	}
 	dbs_tuners_ins.ignore_nice = input;
@@ -211,7 +212,7 @@ static ssize_t store_ignore_nice_load(struct cpufreq_policy *policy,
 		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;
 	}
-	up(&dbs_sem);
+	mutex_unlock(&dbs_mutex);
 
 	return count;
 }
@@ -356,12 +357,12 @@ static void dbs_check_cpu(int cpu)
 static void do_dbs_timer(void *data)
 { 
 	int i;
-	down(&dbs_sem);
+	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));
-	up(&dbs_sem);
+	mutex_unlock(&dbs_mutex);
 } 
 
 static inline void dbs_timer_init(void)
@@ -399,7 +400,7 @@ static int cpufreq_governor_dbs(struct cpufreq_policy *policy,
 		if (this_dbs_info->enable) /* Already enabled */
 			break;
 		 
-		down(&dbs_sem);
+		mutex_lock(&dbs_mutex);
 		for_each_cpu_mask(j, policy->cpus) {
 			struct cpu_dbs_info_s *j_dbs_info;
 			j_dbs_info = &per_cpu(cpu_dbs_info, j);
@@ -435,11 +436,11 @@ static int cpufreq_governor_dbs(struct cpufreq_policy *policy,
 			dbs_timer_init();
 		}
 		
-		up(&dbs_sem);
+		mutex_unlock(&dbs_mutex);
 		break;
 
 	case CPUFREQ_GOV_STOP:
-		down(&dbs_sem);
+		mutex_lock(&dbs_mutex);
 		this_dbs_info->enable = 0;
 		sysfs_remove_group(&policy->kobj, &dbs_attr_group);
 		dbs_enable--;
@@ -450,12 +451,12 @@ static int cpufreq_governor_dbs(struct cpufreq_policy *policy,
 		if (dbs_enable == 0) 
 			dbs_timer_exit();
 		
-		up(&dbs_sem);
+		mutex_unlock(&dbs_mutex);
 
 		break;
 
 	case CPUFREQ_GOV_LIMITS:
-		down(&dbs_sem);
+		mutex_lock(&dbs_mutex);
 		if (policy->max < this_dbs_info->cur_policy->cur)
 			__cpufreq_driver_target(
 					this_dbs_info->cur_policy,
@@ -464,7 +465,7 @@ static int cpufreq_governor_dbs(struct cpufreq_policy *policy,
 			__cpufreq_driver_target(
 					this_dbs_info->cur_policy,
 				       	policy->min, CPUFREQ_RELATION_L);
-		up(&dbs_sem);
+		mutex_unlock(&dbs_mutex);
 		break;
 	}
 	return 0;

drivers/cpufreq/cpufreq_userspace.c

@@ -1,3 +1,4 @@
+
 /*
  *  linux/drivers/cpufreq/cpufreq_userspace.c
  *
@@ -21,6 +22,7 @@
 #include <linux/types.h>
 #include <linux/fs.h>
 #include <linux/sysfs.h>
+#include <linux/mutex.h>
 
 #include <asm/uaccess.h>
 
@@ -33,9 +35,8 @@ static unsigned int	cpu_min_freq[NR_CPUS];
 static unsigned int	cpu_cur_freq[NR_CPUS]; /* current CPU freq */
 static unsigned int	cpu_set_freq[NR_CPUS]; /* CPU freq desired by userspace */
 static unsigned int	cpu_is_managed[NR_CPUS];
-static struct cpufreq_policy current_policy[NR_CPUS];
 
-static DECLARE_MUTEX	(userspace_sem); 
+static DEFINE_MUTEX	(userspace_mutex);
 
 #define dprintk(msg...) cpufreq_debug_printk(CPUFREQ_DEBUG_GOVERNOR, "userspace", msg)
 
@@ -64,35 +65,34 @@ static struct notifier_block userspace_cpufreq_notifier_block = {
  *
  * Sets the CPU frequency to freq.
  */
-static int cpufreq_set(unsigned int freq, unsigned int cpu)
+static int cpufreq_set(unsigned int freq, struct cpufreq_policy *policy)
 {
 	int ret = -EINVAL;
 
-	dprintk("cpufreq_set for cpu %u, freq %u kHz\n", cpu, freq);
+	dprintk("cpufreq_set for cpu %u, freq %u kHz\n", policy->cpu, freq);
 
-	down(&userspace_sem);
-	if (!cpu_is_managed[cpu])
+	mutex_lock(&userspace_mutex);
+	if (!cpu_is_managed[policy->cpu])
 		goto err;
 
-	cpu_set_freq[cpu] = freq;
+	cpu_set_freq[policy->cpu] = freq;
 
-	if (freq < cpu_min_freq[cpu])
-		freq = cpu_min_freq[cpu];
-	if (freq > cpu_max_freq[cpu])
-		freq = cpu_max_freq[cpu];
+	if (freq < cpu_min_freq[policy->cpu])
+		freq = cpu_min_freq[policy->cpu];
+	if (freq > cpu_max_freq[policy->cpu])
+		freq = cpu_max_freq[policy->cpu];
 
 	/*
 	 * We're safe from concurrent calls to ->target() here
-	 * as we hold the userspace_sem lock. If we were calling
+	 * as we hold the userspace_mutex lock. If we were calling
 	 * cpufreq_driver_target, a deadlock situation might occur:
-	 * A: cpufreq_set (lock userspace_sem) -> cpufreq_driver_target(lock policy->lock)
-	 * B: cpufreq_set_policy(lock policy->lock) -> __cpufreq_governor -> cpufreq_governor_userspace (lock userspace_sem)
+	 * 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(&current_policy[cpu], freq, 
-	      CPUFREQ_RELATION_L);
+	ret = __cpufreq_driver_target(policy, freq, CPUFREQ_RELATION_L);
 
  err:
-	up(&userspace_sem);
+	mutex_unlock(&userspace_mutex);
 	return ret;
 }
 
@@ -113,7 +113,7 @@ store_speed (struct cpufreq_policy *policy, const char *buf, size_t count)
 	if (ret != 1)
 		return -EINVAL;
 
-	cpufreq_set(freq, policy->cpu);
+	cpufreq_set(freq, policy);
 
 	return count;
 }
@@ -134,44 +134,48 @@ static int cpufreq_governor_userspace(struct cpufreq_policy *policy,
 		if (!cpu_online(cpu))
 			return -EINVAL;
 		BUG_ON(!policy->cur);
-		down(&userspace_sem);
+		mutex_lock(&userspace_mutex);
 		cpu_is_managed[cpu] = 1;		
 		cpu_min_freq[cpu] = policy->min;
 		cpu_max_freq[cpu] = policy->max;
 		cpu_cur_freq[cpu] = policy->cur;
 		cpu_set_freq[cpu] = policy->cur;
 		sysfs_create_file (&policy->kobj, &freq_attr_scaling_setspeed.attr);
-		memcpy (&current_policy[cpu], policy, sizeof(struct cpufreq_policy));
 		dprintk("managing cpu %u started (%u - %u kHz, currently %u kHz)\n", cpu, cpu_min_freq[cpu], cpu_max_freq[cpu], cpu_cur_freq[cpu]);
-		up(&userspace_sem);
+		mutex_unlock(&userspace_mutex);
 		break;
 	case CPUFREQ_GOV_STOP:
-		down(&userspace_sem);
+		mutex_lock(&userspace_mutex);
 		cpu_is_managed[cpu] = 0;
 		cpu_min_freq[cpu] = 0;
 		cpu_max_freq[cpu] = 0;
 		cpu_set_freq[cpu] = 0;
 		sysfs_remove_file (&policy->kobj, &freq_attr_scaling_setspeed.attr);
 		dprintk("managing cpu %u stopped\n", cpu);
-		up(&userspace_sem);
+		mutex_unlock(&userspace_mutex);
 		break;
 	case CPUFREQ_GOV_LIMITS:
-		down(&userspace_sem);
-		cpu_min_freq[cpu] = policy->min;
-		cpu_max_freq[cpu] = policy->max;
-		dprintk("limit event for cpu %u: %u - %u kHz, currently %u kHz, last set to %u kHz\n", cpu, cpu_min_freq[cpu], cpu_max_freq[cpu], cpu_cur_freq[cpu], cpu_set_freq[cpu]);
+		mutex_lock(&userspace_mutex);
+		dprintk("limit event for cpu %u: %u - %u kHz,"
+			"currently %u kHz, last set to %u kHz\n",
+			cpu, policy->min, policy->max,
+			cpu_cur_freq[cpu], cpu_set_freq[cpu]);
 		if (policy->max < cpu_set_freq[cpu]) {
-			__cpufreq_driver_target(&current_policy[cpu], policy->max, 
-			      CPUFREQ_RELATION_H);
-		} else if (policy->min > cpu_set_freq[cpu]) {
-			__cpufreq_driver_target(&current_policy[cpu], policy->min, 
-			      CPUFREQ_RELATION_L);
-		} else {
-			__cpufreq_driver_target(&current_policy[cpu], cpu_set_freq[cpu],
-			      CPUFREQ_RELATION_L);
+			__cpufreq_driver_target(policy, policy->max,
+						CPUFREQ_RELATION_H);
+		}
+		else if (policy->min > cpu_set_freq[cpu]) {
+			__cpufreq_driver_target(policy, policy->min,
+						CPUFREQ_RELATION_L);
 		}
-		memcpy (&current_policy[cpu], policy, sizeof(struct cpufreq_policy));
-		up(&userspace_sem);
+		else {
+			__cpufreq_driver_target(policy, cpu_set_freq[cpu],
+						CPUFREQ_RELATION_L);
+		}
+		cpu_min_freq[cpu] = policy->min;
+		cpu_max_freq[cpu] = policy->max;
+		cpu_cur_freq[cpu] = policy->cur;
+		mutex_unlock(&userspace_mutex);
 		break;
 	}
 	return 0;

include/linux/cpufreq.h

@@ -14,6 +14,7 @@
 #ifndef _LINUX_CPUFREQ_H
 #define _LINUX_CPUFREQ_H
 
+#include <linux/mutex.h>
 #include <linux/config.h>
 #include <linux/notifier.h>
 #include <linux/threads.h>
@@ -82,7 +83,7 @@ struct cpufreq_policy {
         unsigned int		policy; /* see above */
 	struct cpufreq_governor	*governor; /* see below */
 
- 	struct semaphore	lock;   /* CPU ->setpolicy or ->target may
+ 	struct mutex		lock;   /* CPU ->setpolicy or ->target may
 					   only be called once a time */
 
 	struct work_struct	update; /* if update_policy() needs to be