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path: root/drivers/cpufreq/cpufreq_userspace.c
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Diffstat (limited to 'drivers/cpufreq/cpufreq_userspace.c')
-rw-r--r--drivers/cpufreq/cpufreq_userspace.c27
1 files changed, 14 insertions, 13 deletions
diff --git a/drivers/cpufreq/cpufreq_userspace.c b/drivers/cpufreq/cpufreq_userspace.c
index 1442bbada053..66d2d1d6c80f 100644
--- a/drivers/cpufreq/cpufreq_userspace.c
+++ b/drivers/cpufreq/cpufreq_userspace.c
@@ -24,9 +24,6 @@
24#include <linux/sysfs.h> 24#include <linux/sysfs.h>
25#include <linux/mutex.h> 25#include <linux/mutex.h>
26 26
27#include <asm/uaccess.h>
28
29
30/** 27/**
31 * A few values needed by the userspace governor 28 * A few values needed by the userspace governor
32 */ 29 */
@@ -37,7 +34,7 @@ static DEFINE_PER_CPU(unsigned int, cpu_set_freq); /* CPU freq desired by
37 userspace */ 34 userspace */
38static DEFINE_PER_CPU(unsigned int, cpu_is_managed); 35static DEFINE_PER_CPU(unsigned int, cpu_is_managed);
39 36
40static DEFINE_MUTEX (userspace_mutex); 37static DEFINE_MUTEX(userspace_mutex);
41static int cpus_using_userspace_governor; 38static int cpus_using_userspace_governor;
42 39
43#define dprintk(msg...) \ 40#define dprintk(msg...) \
@@ -46,9 +43,9 @@ static int cpus_using_userspace_governor;
46/* keep track of frequency transitions */ 43/* keep track of frequency transitions */
47static int 44static int
48userspace_cpufreq_notifier(struct notifier_block *nb, unsigned long val, 45userspace_cpufreq_notifier(struct notifier_block *nb, unsigned long val,
49 void *data) 46 void *data)
50{ 47{
51 struct cpufreq_freqs *freq = data; 48 struct cpufreq_freqs *freq = data;
52 49
53 if (!per_cpu(cpu_is_managed, freq->cpu)) 50 if (!per_cpu(cpu_is_managed, freq->cpu))
54 return 0; 51 return 0;
@@ -57,11 +54,11 @@ userspace_cpufreq_notifier(struct notifier_block *nb, unsigned long val,
57 freq->cpu, freq->new); 54 freq->cpu, freq->new);
58 per_cpu(cpu_cur_freq, freq->cpu) = freq->new; 55 per_cpu(cpu_cur_freq, freq->cpu) = freq->new;
59 56
60 return 0; 57 return 0;
61} 58}
62 59
63static struct notifier_block userspace_cpufreq_notifier_block = { 60static struct notifier_block userspace_cpufreq_notifier_block = {
64 .notifier_call = userspace_cpufreq_notifier 61 .notifier_call = userspace_cpufreq_notifier
65}; 62};
66 63
67 64
@@ -93,8 +90,11 @@ static int cpufreq_set(struct cpufreq_policy *policy, unsigned int freq)
93 * We're safe from concurrent calls to ->target() here 90 * We're safe from concurrent calls to ->target() here
94 * as we hold the userspace_mutex lock. If we were calling 91 * as we hold the userspace_mutex lock. If we were calling
95 * cpufreq_driver_target, a deadlock situation might occur: 92 * cpufreq_driver_target, a deadlock situation might occur:
96 * A: cpufreq_set (lock userspace_mutex) -> cpufreq_driver_target(lock policy->lock) 93 * A: cpufreq_set (lock userspace_mutex) ->
97 * B: cpufreq_set_policy(lock policy->lock) -> __cpufreq_governor -> cpufreq_governor_userspace (lock userspace_mutex) 94 * cpufreq_driver_target(lock policy->lock)
95 * B: cpufreq_set_policy(lock policy->lock) ->
96 * __cpufreq_governor ->
97 * cpufreq_governor_userspace (lock userspace_mutex)
98 */ 98 */
99 ret = __cpufreq_driver_target(policy, freq, CPUFREQ_RELATION_L); 99 ret = __cpufreq_driver_target(policy, freq, CPUFREQ_RELATION_L);
100 100
@@ -210,9 +210,10 @@ static void __exit cpufreq_gov_userspace_exit(void)
210} 210}
211 211
212 212
213MODULE_AUTHOR ("Dominik Brodowski <linux@brodo.de>, Russell King <rmk@arm.linux.org.uk>"); 213MODULE_AUTHOR("Dominik Brodowski <linux@brodo.de>, "
214MODULE_DESCRIPTION ("CPUfreq policy governor 'userspace'"); 214 "Russell King <rmk@arm.linux.org.uk>");
215MODULE_LICENSE ("GPL"); 215MODULE_DESCRIPTION("CPUfreq policy governor 'userspace'");
216MODULE_LICENSE("GPL");
216 217
217#ifdef CONFIG_CPU_FREQ_DEFAULT_GOV_USERSPACE 218#ifdef CONFIG_CPU_FREQ_DEFAULT_GOV_USERSPACE
218fs_initcall(cpufreq_gov_userspace_init); 219fs_initcall(cpufreq_gov_userspace_init);