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authorLinus Torvalds <torvalds@woody.linux-foundation.org>2007-07-12 13:42:43 -0700
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-07-12 13:42:43 -0700
commit702ed6ef375c19d65f2eeeefd3851476f2c4cee4 (patch)
treefe46588dcc716f64a04310797d9446573614d3fc /drivers/cpufreq/cpufreq_userspace.c
parent2f41fc806434f8466bb361570589a3f6099ca65d (diff)
parent58a7295bc8073b9e668c329cb9ceb5b668c2b15d (diff)
Merge master.kernel.org:/pub/scm/linux/kernel/git/davej/cpufreq
* master.kernel.org:/pub/scm/linux/kernel/git/davej/cpufreq: [CPUFREQ] Fix sysfs_create_file return value handling [CPUFREQ] ondemand: fix tickless accounting and software coordination bug [CPUFREQ] ondemand: add a check to avoid negative load calculation [CPUFREQ] Keep userspace governor quiet when it is not being used [CPUFREQ] Longhaul - Proper register access [CPUFREQ] Kconfig powernow-k8 driver should depend on ACPI P-States driver [CPUFREQ] Longhaul - Replace ACPI functions with direct I/O [CPUFREQ] Longhaul - Remove duplicate multipliers [CPUFREQ] Longhaul - Embedded "conservative" [CPUFREQ] acpi-cpufreq: Proper ReadModifyWrite of PERF_CTL MSR [CPUFREQ] check return value of sysfs_create_file [CPUFREQ] Longhaul - Check ACPI "BM DMA in progress" bit [CPUFREQ] Longhaul - Move old_ratio to correct place [CPUFREQ] Longhaul - VT8237 support [CPUFREQ] Longhaul - Use all kinds of support [CPUFREQ] powernow-k8: clarify number of cores.
Diffstat (limited to 'drivers/cpufreq/cpufreq_userspace.c')
-rw-r--r--drivers/cpufreq/cpufreq_userspace.c23
1 files changed, 20 insertions, 3 deletions
diff --git a/drivers/cpufreq/cpufreq_userspace.c b/drivers/cpufreq/cpufreq_userspace.c
index a648970338b..51bedab6c80 100644
--- a/drivers/cpufreq/cpufreq_userspace.c
+++ b/drivers/cpufreq/cpufreq_userspace.c
@@ -37,6 +37,7 @@ static unsigned int cpu_set_freq[NR_CPUS]; /* CPU freq desired by userspace */
static unsigned int cpu_is_managed[NR_CPUS];
static DEFINE_MUTEX (userspace_mutex);
+static int cpus_using_userspace_governor;
#define dprintk(msg...) cpufreq_debug_printk(CPUFREQ_DEBUG_GOVERNOR, "userspace", msg)
@@ -47,7 +48,11 @@ userspace_cpufreq_notifier(struct notifier_block *nb, unsigned long val,
{
struct cpufreq_freqs *freq = data;
- dprintk("saving cpu_cur_freq of cpu %u to be %u kHz\n", freq->cpu, freq->new);
+ if (!cpu_is_managed[freq->cpu])
+ return 0;
+
+ dprintk("saving cpu_cur_freq of cpu %u to be %u kHz\n",
+ freq->cpu, freq->new);
cpu_cur_freq[freq->cpu] = freq->new;
return 0;
@@ -142,6 +147,13 @@ static int cpufreq_governor_userspace(struct cpufreq_policy *policy,
if (rc)
goto start_out;
+ if (cpus_using_userspace_governor == 0) {
+ cpufreq_register_notifier(
+ &userspace_cpufreq_notifier_block,
+ CPUFREQ_TRANSITION_NOTIFIER);
+ }
+ cpus_using_userspace_governor++;
+
cpu_is_managed[cpu] = 1;
cpu_min_freq[cpu] = policy->min;
cpu_max_freq[cpu] = policy->max;
@@ -153,6 +165,13 @@ start_out:
break;
case CPUFREQ_GOV_STOP:
mutex_lock(&userspace_mutex);
+ cpus_using_userspace_governor--;
+ if (cpus_using_userspace_governor == 0) {
+ cpufreq_unregister_notifier(
+ &userspace_cpufreq_notifier_block,
+ CPUFREQ_TRANSITION_NOTIFIER);
+ }
+
cpu_is_managed[cpu] = 0;
cpu_min_freq[cpu] = 0;
cpu_max_freq[cpu] = 0;
@@ -198,7 +217,6 @@ EXPORT_SYMBOL(cpufreq_gov_userspace);
static int __init cpufreq_gov_userspace_init(void)
{
- cpufreq_register_notifier(&userspace_cpufreq_notifier_block, CPUFREQ_TRANSITION_NOTIFIER);
return cpufreq_register_governor(&cpufreq_gov_userspace);
}
@@ -206,7 +224,6 @@ static int __init cpufreq_gov_userspace_init(void)
static void __exit cpufreq_gov_userspace_exit(void)
{
cpufreq_unregister_governor(&cpufreq_gov_userspace);
- cpufreq_unregister_notifier(&userspace_cpufreq_notifier_block, CPUFREQ_TRANSITION_NOTIFIER);
}