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Commit 8cf30456 authored by Len Brown's avatar Len Brown Committed by Len Brown
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[ACPI] Split the ACPI Processor passive cooling code into a different file 

Signed-off-by: default avatarDominik Brodowski <linux@dominikbrodowski.de>
Signed-off-by: default avatarLen Brown <len.brown@intel.com>
parent a19a7c64
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Showing with 429 additions and 361 deletions
drivers/acpi/Makefile
View file @ 8cf30456
......@@ -29,7 +29,8 @@ obj-$(CONFIG_ACPI_INTERPRETER) += osl.o utils.o \
#
# ACPI Bus and Device Drivers
#
processor_tmp-objs += processor.o processor_throttling.o processor_idle.o
processor_tmp-objs += processor.o processor_throttling.o processor_idle.o\
processor_thermal.o
ifdef CONFIG_CPU_FREQ
processor_tmp-objs += processor_perflib.o
endif
......
drivers/acpi/processor.c
View file @ 8cf30456
......@@ -87,8 +87,6 @@ static int acpi_processor_add (struct acpi_device *device);
static int acpi_processor_start (struct acpi_device *device);
static int acpi_processor_remove (struct acpi_device *device, int type);
static int acpi_processor_info_open_fs(struct inode *inode, struct file *file);
static int acpi_processor_limit_open_fs(struct inode *inode, struct file *file);
static int acpi_processor_get_limit_info(struct acpi_processor *pr);
static void acpi_processor_notify ( acpi_handle handle, u32 event, void *data);
static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu);
static int acpi_processor_handle_eject(struct acpi_processor *pr);
......@@ -108,19 +106,14 @@ static struct acpi_driver acpi_processor_driver = {
#define UNINSTALL_NOTIFY_HANDLER 2
static struct file_operations acpi_processor_info_fops = {
struct file_operations acpi_processor_info_fops = {
.open = acpi_processor_info_open_fs,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
static struct file_operations acpi_processor_limit_fops = {
.open = acpi_processor_limit_open_fs,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
struct acpi_processor *processors[NR_CPUS];
struct acpi_processor_errata errata;
......@@ -265,280 +258,6 @@ acpi_processor_errata (
}
/* --------------------------------------------------------------------------
Limit Interface
-------------------------------------------------------------------------- */
static int
acpi_processor_apply_limit (
struct acpi_processor* pr)
{
int result = 0;
u16 px = 0;
u16 tx = 0;
ACPI_FUNCTION_TRACE("acpi_processor_apply_limit");
if (!pr)
return_VALUE(-EINVAL);
if (!pr->flags.limit)
return_VALUE(-ENODEV);
if (pr->flags.throttling) {
if (pr->limit.user.tx > tx)
tx = pr->limit.user.tx;
if (pr->limit.thermal.tx > tx)
tx = pr->limit.thermal.tx;
result = acpi_processor_set_throttling(pr, tx);
if (result)
goto end;
}
pr->limit.state.px = px;
pr->limit.state.tx = tx;
ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Processor [%d] limit set to (P%d:T%d)\n",
pr->id,
pr->limit.state.px,
pr->limit.state.tx));
end:
if (result)
ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Unable to set limit\n"));
return_VALUE(result);
}
#ifdef CONFIG_CPU_FREQ
/* If a passive cooling situation is detected, primarily CPUfreq is used, as it
* offers (in most cases) voltage scaling in addition to frequency scaling, and
* thus a cubic (instead of linear) reduction of energy. Also, we allow for
* _any_ cpufreq driver and not only the acpi-cpufreq driver.
*/
static unsigned int cpufreq_thermal_reduction_pctg[NR_CPUS];
static unsigned int acpi_thermal_cpufreq_is_init = 0;
static int cpu_has_cpufreq(unsigned int cpu)
{
struct cpufreq_policy policy;
if (!acpi_thermal_cpufreq_is_init)
return -ENODEV;
if (!cpufreq_get_policy(&policy, cpu))
return -ENODEV;
return 0;
}
static int acpi_thermal_cpufreq_increase(unsigned int cpu)
{
if (!cpu_has_cpufreq(cpu))
return -ENODEV;
if (cpufreq_thermal_reduction_pctg[cpu] < 60) {
cpufreq_thermal_reduction_pctg[cpu] += 20;
cpufreq_update_policy(cpu);
return 0;
}
return -ERANGE;
}
static int acpi_thermal_cpufreq_decrease(unsigned int cpu)
{
if (!cpu_has_cpufreq(cpu))
return -ENODEV;
if (cpufreq_thermal_reduction_pctg[cpu] >= 20) {
cpufreq_thermal_reduction_pctg[cpu] -= 20;
cpufreq_update_policy(cpu);
return 0;
}
return -ERANGE;
}
static int acpi_thermal_cpufreq_notifier(
struct notifier_block *nb,
unsigned long event,
void *data)
{
struct cpufreq_policy *policy = data;
unsigned long max_freq = 0;
if (event != CPUFREQ_ADJUST)
goto out;
max_freq = (policy->cpuinfo.max_freq * (100 - cpufreq_thermal_reduction_pctg[policy->cpu])) / 100;
cpufreq_verify_within_limits(policy, 0, max_freq);
out:
return 0;
}
static struct notifier_block acpi_thermal_cpufreq_notifier_block = {
.notifier_call = acpi_thermal_cpufreq_notifier,
};
static void acpi_thermal_cpufreq_init(void) {
int i;
for (i=0; i<NR_CPUS; i++)
cpufreq_thermal_reduction_pctg[i] = 0;
i = cpufreq_register_notifier(&acpi_thermal_cpufreq_notifier_block, CPUFREQ_POLICY_NOTIFIER);
if (!i)
acpi_thermal_cpufreq_is_init = 1;
}
static void acpi_thermal_cpufreq_exit(void) {
if (acpi_thermal_cpufreq_is_init)
cpufreq_unregister_notifier(&acpi_thermal_cpufreq_notifier_block, CPUFREQ_POLICY_NOTIFIER);
acpi_thermal_cpufreq_is_init = 0;
}
#else /* ! CONFIG_CPU_FREQ */
static void acpi_thermal_cpufreq_init(void) { return; }
static void acpi_thermal_cpufreq_exit(void) { return; }
static int acpi_thermal_cpufreq_increase(unsigned int cpu) { return -ENODEV; }
static int acpi_thermal_cpufreq_decrease(unsigned int cpu) { return -ENODEV; }
#endif
int
acpi_processor_set_thermal_limit (
acpi_handle handle,
int type)
{
int result = 0;
struct acpi_processor *pr = NULL;
struct acpi_device *device = NULL;
int tx = 0;
ACPI_FUNCTION_TRACE("acpi_processor_set_thermal_limit");
if ((type < ACPI_PROCESSOR_LIMIT_NONE)
|| (type > ACPI_PROCESSOR_LIMIT_DECREMENT))
return_VALUE(-EINVAL);
result = acpi_bus_get_device(handle, &device);
if (result)
return_VALUE(result);
pr = (struct acpi_processor *) acpi_driver_data(device);
if (!pr)
return_VALUE(-ENODEV);
/* Thermal limits are always relative to the current Px/Tx state. */
if (pr->flags.throttling)
pr->limit.thermal.tx = pr->throttling.state;
/*
* Our default policy is to only use throttling at the lowest
* performance state.
*/
tx = pr->limit.thermal.tx;
switch (type) {
case ACPI_PROCESSOR_LIMIT_NONE:
do {
result = acpi_thermal_cpufreq_decrease(pr->id);
} while (!result);
tx = 0;
break;
case ACPI_PROCESSOR_LIMIT_INCREMENT:
/* if going up: P-states first, T-states later */
result = acpi_thermal_cpufreq_increase(pr->id);
if (!result)
goto end;
else if (result == -ERANGE)
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
"At maximum performance state\n"));
if (pr->flags.throttling) {
if (tx == (pr->throttling.state_count - 1))
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
"At maximum throttling state\n"));
else
tx++;
}
break;
case ACPI_PROCESSOR_LIMIT_DECREMENT:
/* if going down: T-states first, P-states later */
if (pr->flags.throttling) {
if (tx == 0)
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
"At minimum throttling state\n"));
else {
tx--;
goto end;
}
}
result = acpi_thermal_cpufreq_decrease(pr->id);
if (result == -ERANGE)
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
"At minimum performance state\n"));
break;
}
end:
if (pr->flags.throttling) {
pr->limit.thermal.px = 0;
pr->limit.thermal.tx = tx;
result = acpi_processor_apply_limit(pr);
if (result)
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"Unable to set thermal limit\n"));
ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Thermal limit now (P%d:T%d)\n",
pr->limit.thermal.px,
pr->limit.thermal.tx));
} else
result = 0;
return_VALUE(result);
}
static int
acpi_processor_get_limit_info (
struct acpi_processor *pr)
{
ACPI_FUNCTION_TRACE("acpi_processor_get_limit_info");
if (!pr)
return_VALUE(-EINVAL);
if (pr->flags.throttling)
pr->flags.limit = 1;
return_VALUE(0);
}
/* --------------------------------------------------------------------------
FS Interface (/proc)
-------------------------------------------------------------------------- */
......@@ -577,83 +296,6 @@ static int acpi_processor_info_open_fs(struct inode *inode, struct file *file)
PDE(inode)->data);
}
static int acpi_processor_limit_seq_show(struct seq_file *seq, void *offset)
{
struct acpi_processor *pr = (struct acpi_processor *)seq->private;
ACPI_FUNCTION_TRACE("acpi_processor_limit_seq_show");
if (!pr)
goto end;
if (!pr->flags.limit) {
seq_puts(seq, "<not supported>\n");
goto end;
}
seq_printf(seq, "active limit: P%d:T%d\n"
"user limit: P%d:T%d\n"
"thermal limit: P%d:T%d\n",
pr->limit.state.px, pr->limit.state.tx,
pr->limit.user.px, pr->limit.user.tx,
pr->limit.thermal.px, pr->limit.thermal.tx);
end:
return_VALUE(0);
}
static int acpi_processor_limit_open_fs(struct inode *inode, struct file *file)
{
return single_open(file, acpi_processor_limit_seq_show,
PDE(inode)->data);
}
static ssize_t
acpi_processor_write_limit (
struct file *file,
const char __user *buffer,
size_t count,
loff_t *data)
{
int result = 0;
struct seq_file *m = (struct seq_file *)file->private_data;
struct acpi_processor *pr = (struct acpi_processor *)m->private;
char limit_string[25] = {'\0'};
int px = 0;
int tx = 0;
ACPI_FUNCTION_TRACE("acpi_processor_write_limit");
if (!pr || (count > sizeof(limit_string) - 1)) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid argument\n"));
return_VALUE(-EINVAL);
}
if (copy_from_user(limit_string, buffer, count)) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid data\n"));
return_VALUE(-EFAULT);
}
limit_string[count] = '\0';
if (sscanf(limit_string, "%d:%d", &px, &tx) != 2) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid data format\n"));
return_VALUE(-EINVAL);
}
if (pr->flags.throttling) {
if ((tx < 0) || (tx > (pr->throttling.state_count - 1))) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid tx\n"));
return_VALUE(-EINVAL);
}
pr->limit.user.tx = tx;
}
result = acpi_processor_apply_limit(pr);
return_VALUE(count);
}
static int
acpi_processor_add_fs (
......
drivers/acpi/processor_thermal.c 0 → 100644
View file @ 8cf30456
/*
* processor_thermal.c - Passive cooling submodule of the ACPI processor driver
*
* Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
* Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
* Copyright (C) 2004 Dominik Brodowski <linux@brodo.de>
* Copyright (C) 2004 Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
* - Added processor hotplug support
*
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or (at
* your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
*
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/cpufreq.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <asm/uaccess.h>
#include <acpi/acpi_bus.h>
#include <acpi/processor.h>
#include <acpi/acpi_drivers.h>
#define ACPI_PROCESSOR_COMPONENT 0x01000000
#define ACPI_PROCESSOR_CLASS "processor"
#define ACPI_PROCESSOR_DRIVER_NAME "ACPI Processor Driver"
#define _COMPONENT ACPI_PROCESSOR_COMPONENT
ACPI_MODULE_NAME ("acpi_processor")
/* --------------------------------------------------------------------------
Limit Interface
-------------------------------------------------------------------------- */
static int
acpi_processor_apply_limit (
struct acpi_processor* pr)
{
int result = 0;
u16 px = 0;
u16 tx = 0;
ACPI_FUNCTION_TRACE("acpi_processor_apply_limit");
if (!pr)
return_VALUE(-EINVAL);
if (!pr->flags.limit)
return_VALUE(-ENODEV);
if (pr->flags.throttling) {
if (pr->limit.user.tx > tx)
tx = pr->limit.user.tx;
if (pr->limit.thermal.tx > tx)
tx = pr->limit.thermal.tx;
result = acpi_processor_set_throttling(pr, tx);
if (result)
goto end;
}
pr->limit.state.px = px;
pr->limit.state.tx = tx;
ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Processor [%d] limit set to (P%d:T%d)\n",
pr->id,
pr->limit.state.px,
pr->limit.state.tx));
end:
if (result)
ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Unable to set limit\n"));
return_VALUE(result);
}
#ifdef CONFIG_CPU_FREQ
/* If a passive cooling situation is detected, primarily CPUfreq is used, as it
* offers (in most cases) voltage scaling in addition to frequency scaling, and
* thus a cubic (instead of linear) reduction of energy. Also, we allow for
* _any_ cpufreq driver and not only the acpi-cpufreq driver.
*/
static unsigned int cpufreq_thermal_reduction_pctg[NR_CPUS];
static unsigned int acpi_thermal_cpufreq_is_init = 0;
static int cpu_has_cpufreq(unsigned int cpu)
{
struct cpufreq_policy policy;
if (!acpi_thermal_cpufreq_is_init)
return -ENODEV;
if (!cpufreq_get_policy(&policy, cpu))
return -ENODEV;
return 0;
}
static int acpi_thermal_cpufreq_increase(unsigned int cpu)
{
if (!cpu_has_cpufreq(cpu))
return -ENODEV;
if (cpufreq_thermal_reduction_pctg[cpu] < 60) {
cpufreq_thermal_reduction_pctg[cpu] += 20;
cpufreq_update_policy(cpu);
return 0;
}
return -ERANGE;
}
static int acpi_thermal_cpufreq_decrease(unsigned int cpu)
{
if (!cpu_has_cpufreq(cpu))
return -ENODEV;
if (cpufreq_thermal_reduction_pctg[cpu] >= 20) {
cpufreq_thermal_reduction_pctg[cpu] -= 20;
cpufreq_update_policy(cpu);
return 0;
}
return -ERANGE;
}
static int acpi_thermal_cpufreq_notifier(
struct notifier_block *nb,
unsigned long event,
void *data)
{
struct cpufreq_policy *policy = data;
unsigned long max_freq = 0;
if (event != CPUFREQ_ADJUST)
goto out;
max_freq = (policy->cpuinfo.max_freq * (100 - cpufreq_thermal_reduction_pctg[policy->cpu])) / 100;
cpufreq_verify_within_limits(policy, 0, max_freq);
out:
return 0;
}
static struct notifier_block acpi_thermal_cpufreq_notifier_block = {
.notifier_call = acpi_thermal_cpufreq_notifier,
};
void acpi_thermal_cpufreq_init(void) {
int i;
for (i=0; i<NR_CPUS; i++)
cpufreq_thermal_reduction_pctg[i] = 0;
i = cpufreq_register_notifier(&acpi_thermal_cpufreq_notifier_block, CPUFREQ_POLICY_NOTIFIER);
if (!i)
acpi_thermal_cpufreq_is_init = 1;
}
void acpi_thermal_cpufreq_exit(void) {
if (acpi_thermal_cpufreq_is_init)
cpufreq_unregister_notifier(&acpi_thermal_cpufreq_notifier_block, CPUFREQ_POLICY_NOTIFIER);
acpi_thermal_cpufreq_is_init = 0;
}
#else /* ! CONFIG_CPU_FREQ */
static int acpi_thermal_cpufreq_increase(unsigned int cpu) { return -ENODEV; }
static int acpi_thermal_cpufreq_decrease(unsigned int cpu) { return -ENODEV; }
#endif
int
acpi_processor_set_thermal_limit (
acpi_handle handle,
int type)
{
int result = 0;
struct acpi_processor *pr = NULL;
struct acpi_device *device = NULL;
int tx = 0;
ACPI_FUNCTION_TRACE("acpi_processor_set_thermal_limit");
if ((type < ACPI_PROCESSOR_LIMIT_NONE)
|| (type > ACPI_PROCESSOR_LIMIT_DECREMENT))
return_VALUE(-EINVAL);
result = acpi_bus_get_device(handle, &device);
if (result)
return_VALUE(result);
pr = (struct acpi_processor *) acpi_driver_data(device);
if (!pr)
return_VALUE(-ENODEV);
/* Thermal limits are always relative to the current Px/Tx state. */
if (pr->flags.throttling)
pr->limit.thermal.tx = pr->throttling.state;
/*
* Our default policy is to only use throttling at the lowest
* performance state.
*/
tx = pr->limit.thermal.tx;
switch (type) {
case ACPI_PROCESSOR_LIMIT_NONE:
do {
result = acpi_thermal_cpufreq_decrease(pr->id);
} while (!result);
tx = 0;
break;
case ACPI_PROCESSOR_LIMIT_INCREMENT:
/* if going up: P-states first, T-states later */
result = acpi_thermal_cpufreq_increase(pr->id);
if (!result)
goto end;
else if (result == -ERANGE)
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
"At maximum performance state\n"));
if (pr->flags.throttling) {
if (tx == (pr->throttling.state_count - 1))
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
"At maximum throttling state\n"));
else
tx++;
}
break;
case ACPI_PROCESSOR_LIMIT_DECREMENT:
/* if going down: T-states first, P-states later */
if (pr->flags.throttling) {
if (tx == 0)
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
"At minimum throttling state\n"));
else {
tx--;
goto end;
}
}
result = acpi_thermal_cpufreq_decrease(pr->id);
if (result == -ERANGE)
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
"At minimum performance state\n"));
break;
}
end:
if (pr->flags.throttling) {
pr->limit.thermal.px = 0;
pr->limit.thermal.tx = tx;
result = acpi_processor_apply_limit(pr);
if (result)
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"Unable to set thermal limit\n"));
ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Thermal limit now (P%d:T%d)\n",
pr->limit.thermal.px,
pr->limit.thermal.tx));
} else
result = 0;
return_VALUE(result);
}
int
acpi_processor_get_limit_info (
struct acpi_processor *pr)
{
ACPI_FUNCTION_TRACE("acpi_processor_get_limit_info");
if (!pr)
return_VALUE(-EINVAL);
if (pr->flags.throttling)
pr->flags.limit = 1;
return_VALUE(0);
}
/* /proc interface */
static int acpi_processor_limit_seq_show(struct seq_file *seq, void *offset)
{
struct acpi_processor *pr = (struct acpi_processor *)seq->private;
ACPI_FUNCTION_TRACE("acpi_processor_limit_seq_show");
if (!pr)
goto end;
if (!pr->flags.limit) {
seq_puts(seq, "<not supported>\n");
goto end;
}
seq_printf(seq, "active limit: P%d:T%d\n"
"user limit: P%d:T%d\n"
"thermal limit: P%d:T%d\n",
pr->limit.state.px, pr->limit.state.tx,
pr->limit.user.px, pr->limit.user.tx,
pr->limit.thermal.px, pr->limit.thermal.tx);
end:
return_VALUE(0);
}
int acpi_processor_limit_open_fs(struct inode *inode, struct file *file)
{
return single_open(file, acpi_processor_limit_seq_show,
PDE(inode)->data);
}
ssize_t acpi_processor_write_limit (
struct file *file,
const char __user *buffer,
size_t count,
loff_t *data)
{
int result = 0;
struct seq_file *m = (struct seq_file *)file->private_data;
struct acpi_processor *pr = (struct acpi_processor *)m->private;
char limit_string[25] = {'\0'};
int px = 0;
int tx = 0;
ACPI_FUNCTION_TRACE("acpi_processor_write_limit");
if (!pr || (count > sizeof(limit_string) - 1)) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid argument\n"));
return_VALUE(-EINVAL);
}
if (copy_from_user(limit_string, buffer, count)) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid data\n"));
return_VALUE(-EFAULT);
}
limit_string[count] = '\0';
if (sscanf(limit_string, "%d:%d", &px, &tx) != 2) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid data format\n"));
return_VALUE(-EINVAL);
}
if (pr->flags.throttling) {
if ((tx < 0) || (tx > (pr->throttling.state_count - 1))) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid tx\n"));
return_VALUE(-EINVAL);
}
pr->limit.user.tx = tx;
}
result = acpi_processor_apply_limit(pr);
return_VALUE(count);
}
struct file_operations acpi_processor_limit_fops = {
.open = acpi_processor_limit_open_fs,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
include/acpi/processor.h
View file @ 8cf30456
......@@ -199,4 +199,23 @@ int acpi_processor_get_power_info (struct acpi_processor *pr);
extern struct file_operations acpi_processor_power_fops;
int no_c2c3(struct dmi_system_id *id);
/* in processor_thermal.c */
int acpi_processor_get_limit_info (struct acpi_processor *pr);
int acpi_processor_limit_open_fs(struct inode *inode, struct file *file);
ssize_t acpi_processor_write_limit (
struct file *file,
const char __user *buffer,
size_t count,
loff_t *data);
extern struct file_operations acpi_processor_limit_fops;
#ifdef CONFIG_CPU_FREQ
void acpi_thermal_cpufreq_init(void);
void acpi_thermal_cpufreq_exit(void);
#else
static inline void acpi_thermal_cpufreq_init(void) { return; }
static inline void acpi_thermal_cpufreq_exit(void) { return; }
#endif
#endif
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