[PATCH 03/10] cpufreq: change cpu freq arrays to per_cpu variables

From: Mike Travis
Date: Mon Mar 24 2008 - 22:21:27 EST

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Change cpufreq_policy and cpufreq_governor pointer tables
from arrays to per_cpu variables in the cpufreq subsystem.

Also some minor complaints from checkpatch.pl fixed.

Based on linux-2.6.25-rc5-mm1

Cc: Dave Jones <davej@xxxxxxxxxxxxxxxxx>
Signed-off-by: Mike Travis <travis@xxxxxxx>
---
drivers/cpufreq/cpufreq.c | 45 +++++++++++++++++++++-------------------
drivers/cpufreq/cpufreq_stats.c | 24 ++++++++++-----------
drivers/cpufreq/freq_table.c | 12 +++++-----
3 files changed, 42 insertions(+), 39 deletions(-)

--- linux-2.6.25-rc5.orig/drivers/cpufreq/cpufreq.c
+++ linux-2.6.25-rc5/drivers/cpufreq/cpufreq.c
@@ -38,10 +38,10 @@
* also protects the cpufreq_cpu_data array.
*/
static struct cpufreq_driver *cpufreq_driver;
-static struct cpufreq_policy *cpufreq_cpu_data[NR_CPUS];
+static DEFINE_PER_CPU(struct cpufreq_policy *, cpufreq_cpu_data);
#ifdef CONFIG_HOTPLUG_CPU
/* This one keeps track of the previously set governor of a removed CPU */
-static struct cpufreq_governor *cpufreq_cpu_governor[NR_CPUS];
+static DEFINE_PER_CPU(struct cpufreq_governor *, cpufreq_cpu_governor);
#endif
static DEFINE_SPINLOCK(cpufreq_driver_lock);

@@ -135,7 +135,7 @@ struct cpufreq_policy *cpufreq_cpu_get(u
struct cpufreq_policy *data;
unsigned long flags;

- if (cpu >= NR_CPUS)
+ if (cpu >= nr_cpu_ids)
goto err_out;

/* get the cpufreq driver */
@@ -149,7 +149,7 @@ struct cpufreq_policy *cpufreq_cpu_get(u

/* get the CPU */
- data = cpufreq_cpu_data[cpu];
+ data = per_cpu(cpufreq_cpu_data, cpu);

if (!data)
goto err_out_put_module;
@@ -327,7 +327,7 @@ void cpufreq_notify_transition(struct cp
dprintk("notification %u of frequency transition to %u kHz\n",
state, freqs->new);

- policy = cpufreq_cpu_data[freqs->cpu];
+ policy = per_cpu(cpufreq_cpu_data, freqs->cpu);
switch (state) {

case CPUFREQ_PRECHANGE:
@@ -809,8 +809,8 @@ static int cpufreq_add_dev(struct sys_de
#ifdef CONFIG_SMP

#ifdef CONFIG_HOTPLUG_CPU
- if (cpufreq_cpu_governor[cpu]){
- policy->governor = cpufreq_cpu_governor[cpu];
+ if (per_cpu(cpufreq_cpu_governor, cpu)) {
+ policy->governor = per_cpu(cpufreq_cpu_governor, cpu);
dprintk("Restoring governor %s for cpu %d\n",
policy->governor->name, cpu);
}
@@ -835,7 +835,7 @@ static int cpufreq_add_dev(struct sys_de

spin_lock_irqsave(&cpufreq_driver_lock, flags);
managed_policy->cpus = policy->cpus;
- cpufreq_cpu_data[cpu] = managed_policy;
+ per_cpu(cpufreq_cpu_data, cpu) = managed_policy;
spin_unlock_irqrestore(&cpufreq_driver_lock, flags);

dprintk("CPU already managed, adding link\n");
@@ -880,7 +880,7 @@ static int cpufreq_add_dev(struct sys_de

spin_lock_irqsave(&cpufreq_driver_lock, flags);
for_each_cpu_mask(j, policy->cpus) {
- cpufreq_cpu_data[j] = policy;
+ per_cpu(cpufreq_cpu_data, j) = policy;
per_cpu(policy_cpu, j) = policy->cpu;
}
spin_unlock_irqrestore(&cpufreq_driver_lock, flags);
@@ -927,7 +927,7 @@ static int cpufreq_add_dev(struct sys_de
err_out_unregister:
spin_lock_irqsave(&cpufreq_driver_lock, flags);
for_each_cpu_mask(j, policy->cpus)
- cpufreq_cpu_data[j] = NULL;
+ per_cpu(cpufreq_cpu_data, j) = NULL;
spin_unlock_irqrestore(&cpufreq_driver_lock, flags);

kobject_put(&policy->kobj);
@@ -970,7 +970,7 @@ static int __cpufreq_remove_dev(struct s
dprintk("unregistering CPU %u\n", cpu);

spin_lock_irqsave(&cpufreq_driver_lock, flags);
- data = cpufreq_cpu_data[cpu];
+ data = per_cpu(cpufreq_cpu_data, cpu);

if (!data) {
spin_unlock_irqrestore(&cpufreq_driver_lock, flags);
@@ -978,7 +978,7 @@ static int __cpufreq_remove_dev(struct s
unlock_policy_rwsem_write(cpu);
return -EINVAL;
}
- cpufreq_cpu_data[cpu] = NULL;
+ per_cpu(cpufreq_cpu_data, cpu) = NULL;

#ifdef CONFIG_SMP
@@ -1000,19 +1000,19 @@ static int __cpufreq_remove_dev(struct s
#ifdef CONFIG_SMP

#ifdef CONFIG_HOTPLUG_CPU
- cpufreq_cpu_governor[cpu] = data->governor;
+ per_cpu(cpufreq_cpu_governor, cpu) = data->governor;
#endif

/* if we have other CPUs still registered, we need to unlink them,
* or else wait_for_completion below will lock up. Clean the
- * cpufreq_cpu_data[] while holding the lock, and remove the sysfs
- * links afterwards.
+ * per_cpu(cpufreq_cpu_data) while holding the lock, and remove
+ * the sysfs links afterwards.
*/
if (unlikely(cpus_weight(data->cpus) > 1)) {
for_each_cpu_mask(j, data->cpus) {
if (j == cpu)
continue;
- cpufreq_cpu_data[j] = NULL;
+ per_cpu(cpufreq_cpu_data, j) = NULL;
}
}

@@ -1024,7 +1024,7 @@ static int __cpufreq_remove_dev(struct s
continue;
dprintk("removing link for cpu %u\n", j);
#ifdef CONFIG_HOTPLUG_CPU
- cpufreq_cpu_governor[j] = data->governor;
+ per_cpu(cpufreq_cpu_governor, j) = data->governor;
#endif
cpu_sys_dev = get_cpu_sysdev(j);
sysfs_remove_link(&cpu_sys_dev->kobj, "cpufreq");
@@ -1134,7 +1134,7 @@ EXPORT_SYMBOL(cpufreq_quick_get);

static unsigned int __cpufreq_get(unsigned int cpu)
{
- struct cpufreq_policy *policy = cpufreq_cpu_data[cpu];
+ struct cpufreq_policy *policy = per_cpu(cpufreq_cpu_data, cpu);
unsigned int ret_freq = 0;

if (!cpufreq_driver->get)
@@ -1803,16 +1803,19 @@ int cpufreq_register_driver(struct cpufr
cpufreq_driver = driver_data;
spin_unlock_irqrestore(&cpufreq_driver_lock, flags);

- ret = sysdev_driver_register(&cpu_sysdev_class,&cpufreq_sysdev_driver);
+ ret = sysdev_driver_register(&cpu_sysdev_class,
+ &cpufreq_sysdev_driver);

if ((!ret) && !(cpufreq_driver->flags & CPUFREQ_STICKY)) {
int i;
ret = -ENODEV;

/* check for at least one working CPU */
- for (i=0; i<NR_CPUS; i++)
- if (cpufreq_cpu_data[i])
+ for (i = 0; i < nr_cpu_ids; i++)
+ if (cpu_possible(i) && per_cpu(cpufreq_cpu_data, i)) {
ret = 0;
+ break;
+ }

/* if all ->init() calls failed, unregister */
if (ret) {
--- linux-2.6.25-rc5.orig/drivers/cpufreq/cpufreq_stats.c
+++ linux-2.6.25-rc5/drivers/cpufreq/cpufreq_stats.c
@@ -43,7 +43,7 @@ struct cpufreq_stats {
#endif
};

-static struct cpufreq_stats *cpufreq_stats_table[NR_CPUS];
+static DEFINE_PER_CPU(struct cpufreq_stats *, cpufreq_stats_table);

struct cpufreq_stats_attribute {
struct attribute attr;
@@ -58,7 +58,7 @@ cpufreq_stats_update (unsigned int cpu)

cur_time = get_jiffies_64();
spin_lock(&cpufreq_stats_lock);
- stat = cpufreq_stats_table[cpu];
+ stat = per_cpu(cpufreq_stats_table, cpu);
if (stat->time_in_state)
stat->time_in_state[stat->last_index] =
cputime64_add(stat->time_in_state[stat->last_index],
@@ -71,11 +71,11 @@ cpufreq_stats_update (unsigned int cpu)
static ssize_t
show_total_trans(struct cpufreq_policy *policy, char *buf)
{
- struct cpufreq_stats *stat = cpufreq_stats_table[policy->cpu];
+ struct cpufreq_stats *stat = per_cpu(cpufreq_stats_table, policy->cpu);
if (!stat)
return 0;
return sprintf(buf, "%d\n",
- cpufreq_stats_table[stat->cpu]->total_trans);
+ per_cpu(cpufreq_stats_table, stat->cpu)->total_trans);
}

static ssize_t
@@ -83,7 +83,7 @@ show_time_in_state(struct cpufreq_policy
{
ssize_t len = 0;
int i;
- struct cpufreq_stats *stat = cpufreq_stats_table[policy->cpu];
+ struct cpufreq_stats *stat = per_cpu(cpufreq_stats_table, policy->cpu);
if (!stat)
return 0;
cpufreq_stats_update(stat->cpu);
@@ -101,7 +101,7 @@ show_trans_table(struct cpufreq_policy *
ssize_t len = 0;
int i, j;

- struct cpufreq_stats *stat = cpufreq_stats_table[policy->cpu];
+ struct cpufreq_stats *stat = per_cpu(cpufreq_stats_table, policy->cpu);
if (!stat)
return 0;
cpufreq_stats_update(stat->cpu);
@@ -170,7 +170,7 @@ freq_table_get_index(struct cpufreq_stat

static void cpufreq_stats_free_table(unsigned int cpu)
{
- struct cpufreq_stats *stat = cpufreq_stats_table[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);
@@ -178,7 +178,7 @@ static void cpufreq_stats_free_table(uns
kfree(stat->time_in_state);
kfree(stat);
}
- cpufreq_stats_table[cpu] = NULL;
+ per_cpu(cpufreq_stats_table, cpu) = NULL;
if (policy)
cpufreq_cpu_put(policy);
}
@@ -192,7 +192,7 @@ cpufreq_stats_create_table (struct cpufr
struct cpufreq_policy *data;
unsigned int alloc_size;
unsigned int cpu = policy->cpu;
- if (cpufreq_stats_table[cpu])
+ if (per_cpu(cpufreq_stats_table, cpu))
return -EBUSY;
if ((stat = kzalloc(sizeof(struct cpufreq_stats), GFP_KERNEL)) == NULL)
return -ENOMEM;
@@ -207,7 +207,7 @@ cpufreq_stats_create_table (struct cpufr
goto error_out;

stat->cpu = cpu;
- cpufreq_stats_table[cpu] = stat;
+ per_cpu(cpufreq_stats_table, cpu) = stat;

for (i=0; table[i].frequency != CPUFREQ_TABLE_END; i++) {
unsigned int freq = table[i].frequency;
@@ -251,7 +251,7 @@ error_out:
cpufreq_cpu_put(data);
error_get_fail:
kfree(stat);
- cpufreq_stats_table[cpu] = NULL;
+ per_cpu(cpufreq_stats_table, cpu) = NULL;
return ret;
}

@@ -284,7 +284,7 @@ cpufreq_stat_notifier_trans (struct noti
if (val != CPUFREQ_POSTCHANGE)
return 0;

- stat = cpufreq_stats_table[freq->cpu];
+ stat = per_cpu(cpufreq_stats_table, freq->cpu);
if (!stat)
return 0;

--- linux-2.6.25-rc5.orig/drivers/cpufreq/freq_table.c
+++ linux-2.6.25-rc5/drivers/cpufreq/freq_table.c
@@ -169,7 +169,7 @@ int cpufreq_frequency_table_target(struc
}
EXPORT_SYMBOL_GPL(cpufreq_frequency_table_target);

-static struct cpufreq_frequency_table *show_table[NR_CPUS];
+static DEFINE_PER_CPU(struct cpufreq_frequency_table *, show_table);
/**
* show_available_freqs - show available frequencies for the specified CPU
*/
@@ -180,10 +180,10 @@ static ssize_t show_available_freqs (str
ssize_t count = 0;
struct cpufreq_frequency_table *table;

- if (!show_table[cpu])
+ if (!per_cpu(show_table, cpu))
return -ENODEV;

- table = show_table[cpu];
+ table = per_cpu(show_table, cpu);

for (i=0; (table[i].frequency != CPUFREQ_TABLE_END); i++) {
if (table[i].frequency == CPUFREQ_ENTRY_INVALID)
@@ -212,20 +212,20 @@ void cpufreq_frequency_table_get_attr(st
unsigned int cpu)
{
dprintk("setting show_table for cpu %u to %p\n", cpu, table);
- show_table[cpu] = table;
+ per_cpu(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);
- show_table[cpu] = NULL;
+ per_cpu(show_table, cpu) = NULL;
}
EXPORT_SYMBOL_GPL(cpufreq_frequency_table_put_attr);

struct cpufreq_frequency_table *cpufreq_frequency_get_table(unsigned int cpu)
{
- return show_table[cpu];
+ return per_cpu(show_table, cpu);
}
EXPORT_SYMBOL_GPL(cpufreq_frequency_get_table);

--
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Next message: Mike Travis: "[PATCH 10/10] sched: Remove fixed NR_CPUS sized arrays in kernel_sched.c"
Previous message: Mike Travis: "[PATCH 05/10] cpumask: Add cpumask_scnprintf_len function"
In reply to: Mike Travis: "[PATCH 05/10] cpumask: Add cpumask_scnprintf_len function"
Next in thread: Mike Travis: "[PATCH 10/10] sched: Remove fixed NR_CPUS sized arrays in kernel_sched.c"
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