linux-kernel - Re: [PATCH] PM / QoS: unconditionally build the feature

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Date:	Mon, 13 Feb 2012 16:40:01 +0100
From:	Jean Pihet <jean.pihet@...oldbits.com>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	Linux PM mailing list <linux-pm@...ts.linux-foundation.org>,
	linux-kernel@...r.kernel.org, Mark Gross <markgross@...gnar.org>,
	Venkatesh Pallipadi <venki@...gle.com>,
	Jean Pihet <j-pihet@...com>
Subject: Re: [PATCH] PM / QoS: unconditionally build the feature

Hi Rafael,

2012/2/13 Rafael J. Wysocki <rjw@...k.pl>:
> On Monday, February 13, 2012, Jean Pihet wrote:
>> The PM QoS feature depends on CONFIG_PM which depends on
>> PM_SLEEP || PM_RUNTIME. This breaks CPU C-states with kernels
>> not having these CONFIGs.
>>
>> This patch allows the feature in all cases.
>>
>> Signed-off-by: Jean Pihet <j-pihet@...com>
>> Reported-by: Venkatesh Pallipadi <venki@...gle.com>
>> Cc: Rafael J. Wysocki <rjw@...k.pl>
>> Cc: Mark Gross <markgross@...gnar.org>
>
> Applied, but I modified the changelog (please have a look at the
> linux-pm/pm-qos branch for details).
Ok thanks! Will look at it as soon as the changes are propagated to linux-pm.

>
> Thanks,
> Rafael
>

Jean

>
>> ---
>>  include/linux/pm_qos.h |   41 +----------------------------------------
>>  kernel/power/Makefile  |    3 ++-
>>  2 files changed, 3 insertions(+), 41 deletions(-)
>>
>> diff --git a/include/linux/pm_qos.h b/include/linux/pm_qos.h
>> index 4d99e4e..105be69 100644
>> --- a/include/linux/pm_qos.h
>> +++ b/include/linux/pm_qos.h
>> @@ -63,7 +63,6 @@ static inline int dev_pm_qos_request_active(struct dev_pm_qos_request *req)
>>       return req->dev != 0;
>>  }
>>
>> -#ifdef CONFIG_PM
>>  int pm_qos_update_target(struct pm_qos_constraints *c, struct plist_node *node,
>>                        enum pm_qos_req_action action, int value);
>>  void pm_qos_add_request(struct pm_qos_request *req, int pm_qos_class,
>> @@ -78,6 +77,7 @@ int pm_qos_remove_notifier(int pm_qos_class, struct notifier_block *notifier);
>>  int pm_qos_request_active(struct pm_qos_request *req);
>>  s32 pm_qos_read_value(struct pm_qos_constraints *c);
>>
>> +#ifdef CONFIG_PM
>>  s32 __dev_pm_qos_read_value(struct device *dev);
>>  s32 dev_pm_qos_read_value(struct device *dev);
>>  int dev_pm_qos_add_request(struct device *dev, struct dev_pm_qos_request *req,
>> @@ -95,45 +95,6 @@ void dev_pm_qos_constraints_destroy(struct device *dev);
>>  int dev_pm_qos_add_ancestor_request(struct device *dev,
>>                                   struct dev_pm_qos_request *req, s32 value);
>>  #else
>> -static inline int pm_qos_update_target(struct pm_qos_constraints *c,
>> -                                    struct plist_node *node,
>> -                                    enum pm_qos_req_action action,
>> -                                    int value)
>> -                     { return 0; }
>> -static inline void pm_qos_add_request(struct pm_qos_request *req,
>> -                                   int pm_qos_class, s32 value)
>> -                     { return; }
>> -static inline void pm_qos_update_request(struct pm_qos_request *req,
>> -                                      s32 new_value)
>> -                     { return; }
>> -static inline void pm_qos_remove_request(struct pm_qos_request *req)
>> -                     { return; }
>> -
>> -static inline int pm_qos_request(int pm_qos_class)
>> -{
>> -     switch (pm_qos_class) {
>> -     case PM_QOS_CPU_DMA_LATENCY:
>> -             return PM_QOS_CPU_DMA_LAT_DEFAULT_VALUE;
>> -     case PM_QOS_NETWORK_LATENCY:
>> -             return PM_QOS_NETWORK_LAT_DEFAULT_VALUE;
>> -     case PM_QOS_NETWORK_THROUGHPUT:
>> -             return PM_QOS_NETWORK_THROUGHPUT_DEFAULT_VALUE;
>> -     default:
>> -             return PM_QOS_DEFAULT_VALUE;
>> -     }
>> -}
>> -
>> -static inline int pm_qos_add_notifier(int pm_qos_class,
>> -                                   struct notifier_block *notifier)
>> -                     { return 0; }
>> -static inline int pm_qos_remove_notifier(int pm_qos_class,
>> -                                      struct notifier_block *notifier)
>> -                     { return 0; }
>> -static inline int pm_qos_request_active(struct pm_qos_request *req)
>> -                     { return 0; }
>> -static inline s32 pm_qos_read_value(struct pm_qos_constraints *c)
>> -                     { return 0; }
>> -
>>  static inline s32 __dev_pm_qos_read_value(struct device *dev)
>>                       { return 0; }
>>  static inline s32 dev_pm_qos_read_value(struct device *dev)
>> diff --git a/kernel/power/Makefile b/kernel/power/Makefile
>> index 07e0e28..66d808e 100644
>> --- a/kernel/power/Makefile
>> +++ b/kernel/power/Makefile
>> @@ -1,7 +1,8 @@
>>
>>  ccflags-$(CONFIG_PM_DEBUG)   := -DDEBUG
>>
>> -obj-$(CONFIG_PM)             += main.o qos.o
>> +obj-y                                += qos.o
>> +obj-$(CONFIG_PM)             += main.o
>>  obj-$(CONFIG_VT_CONSOLE_SLEEP)       += console.o
>>  obj-$(CONFIG_FREEZER)                += process.o
>>  obj-$(CONFIG_SUSPEND)                += suspend.o
>>
>
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