cpuidle / ACPI : move cpuidle_device field out of the acpi_processor_power structure

Currently we have the cpuidle_device field in the acpi_processor_power structure.
This adds a dependency between processor.h and cpuidle.h

Although it is not a real problem, removing this dependency has the benefit of
separating a bit more the cpuidle code from the rest of the acpi code.
Also, the compilation should be a bit improved because we do no longer
include cpuidle.h in processor.h. The preprocessor was generating 30418 loc
and with this patch it generates 30256 loc for processor_thermal.c, a file
which is not concerned at all by cpuidle, like processor_perflib.c and
processor_throttling.c.

That may sound ridiculous, but "small streams make big rivers" :P

This patch moves this field into a static global per cpu variable like what is
done in the intel_idle driver.

Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>

1 files changed, 24 insertions, 8 deletions

diff --git a/drivers/acpi/processor_idle.c b/drivers/acpi/processor_idle.c
index c46a44a8c860..3655ab923812 100644
--- a/drivers/acpi/processor_idle.c
+++ b/drivers/acpi/processor_idle.c
@@ -79,6 +79,8 @@ module_param(bm_check_disable, uint, 0000);
 static unsigned int latency_factor __read_mostly = 2;
 module_param(latency_factor, uint, 0644);
 
+static DEFINE_PER_CPU(struct cpuidle_device *, acpi_cpuidle_device);
+
 static int disabled_by_idle_boot_param(void)
 {
         return boot_option_idle_override == IDLE_POLL ||
@@ -998,7 +1000,7 @@ static int acpi_processor_setup_cpuidle_cx(struct acpi_processor *pr)
         int i, count = CPUIDLE_DRIVER_STATE_START;
         struct acpi_processor_cx *cx;
         struct cpuidle_state_usage *state_usage;
-        struct cpuidle_device *dev = &pr->power.dev;
+        struct cpuidle_device *dev = per_cpu(acpi_cpuidle_device, pr->id);
 
         if (!pr->flags.power_setup_done)
                 return -EINVAL;
@@ -1130,6 +1132,7 @@ static int acpi_processor_setup_cpuidle_states(struct acpi_processor *pr)
 int acpi_processor_hotplug(struct acpi_processor *pr)
 {
         int ret = 0;
+        struct cpuidle_device *dev = per_cpu(acpi_cpuidle_device, pr->id);
 
         if (disabled_by_idle_boot_param())
                 return 0;
@@ -1145,11 +1148,11 @@ int acpi_processor_hotplug(struct acpi_processor *pr)
                 return -ENODEV;
 
         cpuidle_pause_and_lock();
-        cpuidle_disable_device(&pr->power.dev);
+        cpuidle_disable_device(dev);
         acpi_processor_get_power_info(pr);
         if (pr->flags.power) {
                 acpi_processor_setup_cpuidle_cx(pr);
-                ret = cpuidle_enable_device(&pr->power.dev);
+                ret = cpuidle_enable_device(dev);
         }
         cpuidle_resume_and_unlock();
 
@@ -1160,6 +1163,7 @@ int acpi_processor_cst_has_changed(struct acpi_processor *pr)
 {
         int cpu;
         struct acpi_processor *_pr;
+        struct cpuidle_device *dev;
 
         if (disabled_by_idle_boot_param())
                 return 0;
@@ -1190,7 +1194,8 @@ int acpi_processor_cst_has_changed(struct acpi_processor *pr)
                         _pr = per_cpu(processors, cpu);
                         if (!_pr || !_pr->flags.power_setup_done)
                                 continue;
-                        cpuidle_disable_device(&_pr->power.dev);
+                        dev = per_cpu(acpi_cpuidle_device, cpu);
+                        cpuidle_disable_device(dev);
                 }
 
                 /* Populate Updated C-state information */
@@ -1204,7 +1209,8 @@ int acpi_processor_cst_has_changed(struct acpi_processor *pr)
                         acpi_processor_get_power_info(_pr);
                         if (_pr->flags.power) {
                                 acpi_processor_setup_cpuidle_cx(_pr);
-                                cpuidle_enable_device(&_pr->power.dev);
+                                dev = per_cpu(acpi_cpuidle_device, cpu);
+                                cpuidle_enable_device(dev);
                         }
                 }
                 put_online_cpus();
@@ -1220,6 +1226,7 @@ int __cpuinit acpi_processor_power_init(struct acpi_processor *pr)
 {
         acpi_status status = 0;
         int retval;
+        struct cpuidle_device *dev;
         static int first_run;
 
         if (disabled_by_idle_boot_param())
@@ -1265,11 +1272,18 @@ int __cpuinit acpi_processor_power_init(struct acpi_processor *pr)
                         printk(KERN_DEBUG "ACPI: %s registered with cpuidle\n",
                                         acpi_idle_driver.name);
                 }
+
+                dev = kzalloc(sizeof(*dev), GFP_KERNEL);
+                if (!dev)
+                        return -ENOMEM;
+                per_cpu(acpi_cpuidle_device, pr->id) = dev;
+
+                acpi_processor_setup_cpuidle_cx(pr);
+
                 /* Register per-cpu cpuidle_device. Cpuidle driver
                  * must already be registered before registering device
                  */
-                acpi_processor_setup_cpuidle_cx(pr);
-                retval = cpuidle_register_device(&pr->power.dev);
+                retval = cpuidle_register_device(dev);
                 if (retval) {
                         if (acpi_processor_registered == 0)
                                 cpuidle_unregister_driver(&acpi_idle_driver);
@@ -1282,11 +1296,13 @@ int __cpuinit acpi_processor_power_init(struct acpi_processor *pr)
 
 int acpi_processor_power_exit(struct acpi_processor *pr)
 {
+        struct cpuidle_device *dev = per_cpu(acpi_cpuidle_device, pr->id);
+
         if (disabled_by_idle_boot_param())
                 return 0;
 
         if (pr->flags.power) {
-                cpuidle_unregister_device(&pr->power.dev);
+                cpuidle_unregister_device(dev);
                 acpi_processor_registered--;
                 if (acpi_processor_registered == 0)
                         cpuidle_unregister_driver(&acpi_idle_driver);