[PATCH 1/3] acpi : move cpuidle_device field out of the acpi_processor_power structure

[PATCH 1/3] acpi : move cpuidle_device field out of the acpi_processor_power structure

[Daniel Lezcano]

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>
---
 drivers/acpi/processor_idle.c |   32 ++++++++++++++++++++++++--------
 include/acpi/processor.h      |    2 --
 2 files changed, 24 insertions(+), 10 deletions(-)

diff --git a/drivers/acpi/processor_idle.c b/drivers/acpi/processor_idle.c
index de89624..0a6405d 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();
@@ -1221,6 +1227,7 @@ 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())
@@ -1266,11 +1273,18 @@ 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);
@@ -1284,11 +1298,13 @@ int __cpuinit acpi_processor_power_init(struct acpi_processor *pr,
 int acpi_processor_power_exit(struct acpi_processor *pr,
 			      struct acpi_device *device)
 {
+	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);
diff --git a/include/acpi/processor.h b/include/acpi/processor.h
index db427fa..ddd1a44 100644
--- a/include/acpi/processor.h
+++ b/include/acpi/processor.h
@@ -3,7 +3,6 @@
 
 #include <linux/kernel.h>
 #include <linux/cpu.h>
-#include <linux/cpuidle.h>
 #include <linux/thermal.h>
 #include <asm/acpi.h>
 
@@ -64,7 +63,6 @@ struct acpi_processor_cx {
 };
 
 struct acpi_processor_power {
-	struct cpuidle_device dev;
 	struct acpi_processor_cx *state;
 	unsigned long bm_check_timestamp;
 	u32 default_state;
-- 
1.7.5.4

[PATCH 2/3] acpi : remove unused function parameter

[Daniel Lezcano]

The 'device' parameter is not used neither in acpi_processor_power_init
and acpi_processor_power_exit. This patch removes it.

Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
---
 drivers/acpi/processor_driver.c |    6 +++---
 drivers/acpi/processor_idle.c   |    6 ++----
 include/acpi/processor.h        |    6 ++----
 3 files changed, 7 insertions(+), 11 deletions(-)

diff --git a/drivers/acpi/processor_driver.c b/drivers/acpi/processor_driver.c
index bfc31cb..9c9288b 100644
--- a/drivers/acpi/processor_driver.c
+++ b/drivers/acpi/processor_driver.c
@@ -475,7 +475,7 @@ static __ref int acpi_processor_start(struct acpi_processor *pr)
 	acpi_processor_get_limit_info(pr);
 
 	if (!cpuidle_get_driver() || cpuidle_get_driver() == &acpi_idle_driver)
-		acpi_processor_power_init(pr, device);
+		acpi_processor_power_init(pr);
 
 	pr->cdev = thermal_cooling_device_register("Processor", device,
 						   &processor_cooling_ops);
@@ -509,7 +509,7 @@ err_remove_sysfs_thermal:
 err_thermal_unregister:
 	thermal_cooling_device_unregister(pr->cdev);
 err_power_exit:
-	acpi_processor_power_exit(pr, device);
+	acpi_processor_power_exit(pr);
 
 	return result;
 }
@@ -620,7 +620,7 @@ static int acpi_processor_remove(struct acpi_device *device, int type)
 			return -EINVAL;
 	}
 
-	acpi_processor_power_exit(pr, device);
+	acpi_processor_power_exit(pr);
 
 	sysfs_remove_link(&device->dev.kobj, "sysdev");
 
diff --git a/drivers/acpi/processor_idle.c b/drivers/acpi/processor_idle.c
index 0a6405d..3655ab9 100644
--- a/drivers/acpi/processor_idle.c
+++ b/drivers/acpi/processor_idle.c
@@ -1222,8 +1222,7 @@ int acpi_processor_cst_has_changed(struct acpi_processor *pr)
 
 static int acpi_processor_registered;
 
-int __cpuinit acpi_processor_power_init(struct acpi_processor *pr,
-			      struct acpi_device *device)
+int __cpuinit acpi_processor_power_init(struct acpi_processor *pr)
 {
 	acpi_status status = 0;
 	int retval;
@@ -1295,8 +1294,7 @@ int __cpuinit acpi_processor_power_init(struct acpi_processor *pr,
 	return 0;
 }
 
-int acpi_processor_power_exit(struct acpi_processor *pr,
-			      struct acpi_device *device)
+int acpi_processor_power_exit(struct acpi_processor *pr)
 {
 	struct cpuidle_device *dev = per_cpu(acpi_cpuidle_device, pr->id);
 
diff --git a/include/acpi/processor.h b/include/acpi/processor.h
index ddd1a44..555d033 100644
--- a/include/acpi/processor.h
+++ b/include/acpi/processor.h
@@ -322,12 +322,10 @@ extern void acpi_processor_reevaluate_tstate(struct acpi_processor *pr,
 extern const struct file_operations acpi_processor_throttling_fops;
 extern void acpi_processor_throttling_init(void);
 /* in processor_idle.c */
-int acpi_processor_power_init(struct acpi_processor *pr,
-			      struct acpi_device *device);
+int acpi_processor_power_init(struct acpi_processor *pr);
+int acpi_processor_power_exit(struct acpi_processor *pr);
 int acpi_processor_cst_has_changed(struct acpi_processor *pr);
 int acpi_processor_hotplug(struct acpi_processor *pr);
-int acpi_processor_power_exit(struct acpi_processor *pr,
-			      struct acpi_device *device);
 int acpi_processor_suspend(struct device *dev);
 int acpi_processor_resume(struct device *dev);
 extern struct cpuidle_driver acpi_idle_driver;
-- 
1.7.5.4

[PATCH 3/3] acpi : remove pointless variable initialization

[Daniel Lezcano]

The 'errata' variable is a global variable which is set to zero,
no need to do that with a memset in the init function.

Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
---
 drivers/acpi/processor_driver.c |    2 --
 1 files changed, 0 insertions(+), 2 deletions(-)

diff --git a/drivers/acpi/processor_driver.c b/drivers/acpi/processor_driver.c
index 9c9288b..e78c2a5 100644
--- a/drivers/acpi/processor_driver.c
+++ b/drivers/acpi/processor_driver.c
@@ -905,8 +905,6 @@ static int __init acpi_processor_init(void)
 	if (acpi_disabled)
 		return 0;
 
-	memset(&errata, 0, sizeof(errata));
-
 	result = acpi_bus_register_driver(&acpi_processor_driver);
 	if (result < 0)
 		return result;
-- 
1.7.5.4

Re: [PATCH 1/3] acpi : move cpuidle_device field out of the acpi_processor_power structure

[Rafael J. Wysocki]

On Friday, September 14, 2012, Daniel Lezcano wrote:
> 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-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>

I'm inclined to take this one for v3.7.

Len, other ACPI guys, any objections, comments?

Rafael


> ---
>  drivers/acpi/processor_idle.c |   32 ++++++++++++++++++++++++--------
>  include/acpi/processor.h      |    2 --
>  2 files changed, 24 insertions(+), 10 deletions(-)
> 
> diff --git a/drivers/acpi/processor_idle.c b/drivers/acpi/processor_idle.c
> index de89624..0a6405d 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();
> @@ -1221,6 +1227,7 @@ 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())
> @@ -1266,11 +1273,18 @@ 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);
> @@ -1284,11 +1298,13 @@ int __cpuinit acpi_processor_power_init(struct acpi_processor *pr,
>  int acpi_processor_power_exit(struct acpi_processor *pr,
>  			      struct acpi_device *device)
>  {
> +	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);
> diff --git a/include/acpi/processor.h b/include/acpi/processor.h
> index db427fa..ddd1a44 100644
> --- a/include/acpi/processor.h
> +++ b/include/acpi/processor.h
> @@ -3,7 +3,6 @@
>  
>  #include <linux/kernel.h>
>  #include <linux/cpu.h>
> -#include <linux/cpuidle.h>
>  #include <linux/thermal.h>
>  #include <asm/acpi.h>
>  
> @@ -64,7 +63,6 @@ struct acpi_processor_cx {
>  };
>  
>  struct acpi_processor_power {
> -	struct cpuidle_device dev;
>  	struct acpi_processor_cx *state;
>  	unsigned long bm_check_timestamp;
>  	u32 default_state;
> 

Re: [PATCH 2/3] acpi : remove unused function parameter

[Rafael J. Wysocki]

On Friday, September 14, 2012, Daniel Lezcano wrote:
> The 'device' parameter is not used neither in acpi_processor_power_init
> and acpi_processor_power_exit. This patch removes it.
> 
> Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>

Applied to the linux-next branch of the linux-pm.git tree as v3.7 material.

Thanks,
Rafael


> ---
>  drivers/acpi/processor_driver.c |    6 +++---
>  drivers/acpi/processor_idle.c   |    6 ++----
>  include/acpi/processor.h        |    6 ++----
>  3 files changed, 7 insertions(+), 11 deletions(-)
> 
> diff --git a/drivers/acpi/processor_driver.c b/drivers/acpi/processor_driver.c
> index bfc31cb..9c9288b 100644
> --- a/drivers/acpi/processor_driver.c
> +++ b/drivers/acpi/processor_driver.c
> @@ -475,7 +475,7 @@ static __ref int acpi_processor_start(struct acpi_processor *pr)
>  	acpi_processor_get_limit_info(pr);
>  
>  	if (!cpuidle_get_driver() || cpuidle_get_driver() == &acpi_idle_driver)
> -		acpi_processor_power_init(pr, device);
> +		acpi_processor_power_init(pr);
>  
>  	pr->cdev = thermal_cooling_device_register("Processor", device,
>  						   &processor_cooling_ops);
> @@ -509,7 +509,7 @@ err_remove_sysfs_thermal:
>  err_thermal_unregister:
>  	thermal_cooling_device_unregister(pr->cdev);
>  err_power_exit:
> -	acpi_processor_power_exit(pr, device);
> +	acpi_processor_power_exit(pr);
>  
>  	return result;
>  }
> @@ -620,7 +620,7 @@ static int acpi_processor_remove(struct acpi_device *device, int type)
>  			return -EINVAL;
>  	}
>  
> -	acpi_processor_power_exit(pr, device);
> +	acpi_processor_power_exit(pr);
>  
>  	sysfs_remove_link(&device->dev.kobj, "sysdev");
>  
> diff --git a/drivers/acpi/processor_idle.c b/drivers/acpi/processor_idle.c
> index 0a6405d..3655ab9 100644
> --- a/drivers/acpi/processor_idle.c
> +++ b/drivers/acpi/processor_idle.c
> @@ -1222,8 +1222,7 @@ int acpi_processor_cst_has_changed(struct acpi_processor *pr)
>  
>  static int acpi_processor_registered;
>  
> -int __cpuinit acpi_processor_power_init(struct acpi_processor *pr,
> -			      struct acpi_device *device)
> +int __cpuinit acpi_processor_power_init(struct acpi_processor *pr)
>  {
>  	acpi_status status = 0;
>  	int retval;
> @@ -1295,8 +1294,7 @@ int __cpuinit acpi_processor_power_init(struct acpi_processor *pr,
>  	return 0;
>  }
>  
> -int acpi_processor_power_exit(struct acpi_processor *pr,
> -			      struct acpi_device *device)
> +int acpi_processor_power_exit(struct acpi_processor *pr)
>  {
>  	struct cpuidle_device *dev = per_cpu(acpi_cpuidle_device, pr->id);
>  
> diff --git a/include/acpi/processor.h b/include/acpi/processor.h
> index ddd1a44..555d033 100644
> --- a/include/acpi/processor.h
> +++ b/include/acpi/processor.h
> @@ -322,12 +322,10 @@ extern void acpi_processor_reevaluate_tstate(struct acpi_processor *pr,
>  extern const struct file_operations acpi_processor_throttling_fops;
>  extern void acpi_processor_throttling_init(void);
>  /* in processor_idle.c */
> -int acpi_processor_power_init(struct acpi_processor *pr,
> -			      struct acpi_device *device);
> +int acpi_processor_power_init(struct acpi_processor *pr);
> +int acpi_processor_power_exit(struct acpi_processor *pr);
>  int acpi_processor_cst_has_changed(struct acpi_processor *pr);
>  int acpi_processor_hotplug(struct acpi_processor *pr);
> -int acpi_processor_power_exit(struct acpi_processor *pr,
> -			      struct acpi_device *device);
>  int acpi_processor_suspend(struct device *dev);
>  int acpi_processor_resume(struct device *dev);
>  extern struct cpuidle_driver acpi_idle_driver;
> 

Re: [PATCH 3/3] acpi : remove pointless variable initialization

[Rafael J. Wysocki]

On Friday, September 14, 2012, Daniel Lezcano wrote:
> The 'errata' variable is a global variable which is set to zero,
> no need to do that with a memset in the init function.
> 
> Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>

Applied to the linux-next branch of the linux-pm.git tree as v3.7 material.

Thanks,
Rafael


> ---
>  drivers/acpi/processor_driver.c |    2 --
>  1 files changed, 0 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/acpi/processor_driver.c b/drivers/acpi/processor_driver.c
> index 9c9288b..e78c2a5 100644
> --- a/drivers/acpi/processor_driver.c
> +++ b/drivers/acpi/processor_driver.c
> @@ -905,8 +905,6 @@ static int __init acpi_processor_init(void)
>  	if (acpi_disabled)
>  		return 0;
>  
> -	memset(&errata, 0, sizeof(errata));
> -
>  	result = acpi_bus_register_driver(&acpi_processor_driver);
>  	if (result < 0)
>  		return result;
>