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Date: Tue, 26 Mar 2013 11:12:20 -0600
From: Zhang Rui <rui.zhang@...el.com>
To: "R, Durgadoss" <durgadoss.r@...el.com>
Cc: "linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"amit.daniel@...sung.com" <amit.daniel@...sung.com>,
"andi@...as.de" <andi@...as.de>
Subject: RE: [RFC PATCH 3/5] Thermal: build thermal governors into
thermal_sys module
On Tue, 2013-03-26 at 10:53 -0600, R, Durgadoss wrote:
> Hi Rui,
>
> > -----Original Message-----
> > From: Zhang, Rui
> > Sent: Tuesday, March 26, 2013 9:56 PM
> > To: linux-pm@...r.kernel.org; linux-kernel@...r.kernel.org
> > Cc: amit.daniel@...sung.com; R, Durgadoss; andi@...as.de; Zhang, Rui
> > Subject: [RFC PATCH 3/5] Thermal: build thermal governors into thermal_sys
> > module
> >
> > Signed-off-by: Zhang Rui <rui.zhang@...el.com>
> > ---
> > drivers/thermal/Makefile | 6 +++---
> > drivers/thermal/fair_share.c | 15 ++-------------
> > drivers/thermal/step_wise.c | 16 ++--------------
> > drivers/thermal/thermal_core.c | 36
> > ++++++++++++++++++++++++++++++++++--
> > drivers/thermal/thermal_core.h | 25 +++++++++++++++++++++++++
> > drivers/thermal/user_space.c | 15 ++-------------
> > include/linux/thermal.h | 1 -
> > 7 files changed, 68 insertions(+), 46 deletions(-)
> >
> > diff --git a/drivers/thermal/Makefile b/drivers/thermal/Makefile
> > index b2009bd..b7fffc7 100644
> > --- a/drivers/thermal/Makefile
> > +++ b/drivers/thermal/Makefile
> > @@ -6,9 +6,9 @@ obj-$(CONFIG_THERMAL) += thermal_sys.o
> > thermal_sys-y += thermal_core.o
> >
> > # governors
> > -obj-$(CONFIG_THERMAL_GOV_FAIR_SHARE) += fair_share.o
> > -obj-$(CONFIG_THERMAL_GOV_STEP_WISE) += step_wise.o
> > -obj-$(CONFIG_THERMAL_GOV_USER_SPACE) += user_space.o
> > +thermal_sys-$(CONFIG_THERMAL_GOV_FAIR_SHARE) +=
> > fair_share.o
> > +thermal_sys-$(CONFIG_THERMAL_GOV_STEP_WISE) += step_wise.o
> > +thermal_sys-$(CONFIG_THERMAL_GOV_USER_SPACE) +=
> > user_space.o
> >
> > # cpufreq cooling
> > obj-$(CONFIG_CPU_THERMAL) += cpu_cooling.o
> > diff --git a/drivers/thermal/fair_share.c b/drivers/thermal/fair_share.c
> > index 792479f..944ba2f 100644
> > --- a/drivers/thermal/fair_share.c
> > +++ b/drivers/thermal/fair_share.c
> > @@ -22,9 +22,6 @@
> > *
> > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> > ~~~~~~~~~~~~~~~~
> > */
> >
> > -#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
> > -
> > -#include <linux/module.h>
> > #include <linux/thermal.h>
> >
> > #include "thermal_core.h"
> > @@ -111,23 +108,15 @@ static int fair_share_throttle(struct
> > thermal_zone_device *tz, int trip)
> > static struct thermal_governor thermal_gov_fair_share = {
> > .name = "fair_share",
> > .throttle = fair_share_throttle,
> > - .owner = THIS_MODULE,
> > };
> >
> > -static int __init thermal_gov_fair_share_init(void)
> > +int thermal_gov_fair_share_register(void)
> > {
> > return thermal_register_governor(&thermal_gov_fair_share);
> > }
> >
> > -static void __exit thermal_gov_fair_share_exit(void)
> > +void thermal_gov_fair_share_unregister(void)
> > {
> > thermal_unregister_governor(&thermal_gov_fair_share);
> > }
> >
> > -/* This should load after thermal framework */
> > -fs_initcall(thermal_gov_fair_share_init);
> > -module_exit(thermal_gov_fair_share_exit);
> > -
> > -MODULE_AUTHOR("Durgadoss R");
> > -MODULE_DESCRIPTION("A simple weight based thermal throttling
> > governor");
> > -MODULE_LICENSE("GPL");
> > diff --git a/drivers/thermal/step_wise.c b/drivers/thermal/step_wise.c
> > index 407cde3..a6c9666 100644
> > --- a/drivers/thermal/step_wise.c
> > +++ b/drivers/thermal/step_wise.c
> > @@ -22,9 +22,6 @@
> > *
> > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> > ~~~~~~~~~~~~~~~~
> > */
> >
> > -#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
> > -
> > -#include <linux/module.h>
> > #include <linux/thermal.h>
> >
> > #include "thermal_core.h"
> > @@ -180,23 +177,14 @@ static int step_wise_throttle(struct
> > thermal_zone_device *tz, int trip)
> > static struct thermal_governor thermal_gov_step_wise = {
> > .name = "step_wise",
> > .throttle = step_wise_throttle,
> > - .owner = THIS_MODULE,
> > };
> >
> > -static int __init thermal_gov_step_wise_init(void)
> > +int thermal_gov_step_wise_register(void)
> > {
> > return thermal_register_governor(&thermal_gov_step_wise);
> > }
> >
> > -static void __exit thermal_gov_step_wise_exit(void)
> > +void thermal_gov_step_wise_unregister(void)
> > {
> > thermal_unregister_governor(&thermal_gov_step_wise);
> > }
> > -
> > -/* This should load after thermal framework */
> > -fs_initcall(thermal_gov_step_wise_init);
> > -module_exit(thermal_gov_step_wise_exit);
> > -
> > -MODULE_AUTHOR("Durgadoss R");
> > -MODULE_DESCRIPTION("A step-by-step thermal throttling governor");
> > -MODULE_LICENSE("GPL");
> > diff --git a/drivers/thermal/thermal_core.c
> > b/drivers/thermal/thermal_core.c
> > index 845ed6e..eac9745 100644
> > --- a/drivers/thermal/thermal_core.c
> > +++ b/drivers/thermal/thermal_core.c
> > @@ -1858,22 +1858,54 @@ static inline int genetlink_init(void) { return 0; }
> > static inline void genetlink_exit(void) {}
> > #endif /* !CONFIG_NET */
> >
> > +static int __init thermal_register_governors(void)
> > +{
> > + int result;
> > +
> > + result = thermal_gov_step_wise_register();
> > + if (result)
>
> [Patches 1,2 are fine with me].
>
thanks.
> A pr_err statement here, saying the registration failed,
> would help us a lot.
>
yes. sounds reasonable to me.
Will add it in V2.
> > + return result;
> > +
> > + result = thermal_gov_fair_share_register();
> > + if (result)
> > + return result;
> > +
> > + result = thermal_gov_user_space_register();
>
> Same check + print statement for the other two as well.
>
yep.
> > +
> > + return result;
> > +}
> > +
> > +static void __exit thermal_unregister_governors(void)
> > +{
> > + thermal_gov_step_wise_unregister();
> > + thermal_gov_fair_share_unregister();
> > + thermal_gov_user_space_unregister();
> > +}
> > +
> > static int __init thermal_init(void)
> > {
> > - int result = 0;
> > + int result;
> > +
> > + result = thermal_register_governors();
> > + if (result)
> > + return result;
> >
> > result = class_register(&thermal_class);
> > if (result)
>
> Shouldn't we do thermal_unregister_governors here ?
>
> > return result;
> >
> > result = genetlink_init();
> > + if (result)
> > + class_unregister(&thermal_class);
>
> Shouldn't we do thermal_unregister_governors here ?
> Probably a goto would make things simpler..
>
IMO, these are not worth cleaning up because the driver will be unloaded
soon.
thanks,
rui
> > +
> > return result;
> > }
> >
> > static void __exit thermal_exit(void)
> > {
> > - class_unregister(&thermal_class);
> > genetlink_exit();
> > + class_unregister(&thermal_class);
> > + thermal_unregister_governors();
> > }
> >
> > fs_initcall(thermal_init);
> > diff --git a/drivers/thermal/thermal_core.h
> > b/drivers/thermal/thermal_core.h
> > index 0d3205a..f84ea0f 100644
> > --- a/drivers/thermal/thermal_core.h
> > +++ b/drivers/thermal/thermal_core.h
> > @@ -50,4 +50,29 @@ struct thermal_instance {
> > struct list_head cdev_node; /* node in cdev->thermal_instances */
> > };
> >
> > +
> > +#ifdef CONFIG_THERMAL_GOV_STEP_WISE
> > +extern int thermal_gov_step_wise_register(void);
> > +extern void thermal_gov_step_wise_unregister(void);
> > +#else
> > +static inline int thermal_gov_step_wise_register(void) { return 0; }
> > +static inline void thermal_gov_step_wise_unregister(void) {}
> > +#endif /* CONFIG_THERMAL_GOV_STEP_WISE */
> > +
> > +#ifdef CONFIG_THERMAL_GOV_FAIR_SHARE
> > +extern int thermal_gov_fair_share_register(void);
> > +extern void thermal_gov_fair_share_unregister(void);
> > +#else
> > +static inline int thermal_gov_fair_share_register(void) { return 0; }
> > +static inline void thermal_gov_fair_share_unregister(void) {}
> > +#endif /* CONFIG_THERMAL_GOV_FAIR_SHARE */
> > +
> > +#ifdef CONFIG_THERMAL_GOV_USER_SPACE
> > +extern int thermal_gov_user_space_register(void);
> > +extern void thermal_gov_user_space_unregister(void);
> > +#else
> > +static inline int thermal_gov_user_space_register(void) { return 0; }
> > +static inline void thermal_gov_user_space_unregister(void) {}
> > +#endif /* CONFIG_THERMAL_GOV_USER_SPACE */
> > +
> > #endif /* __THERMAL_CORE_H__ */
> > diff --git a/drivers/thermal/user_space.c b/drivers/thermal/user_space.c
> > index 6bbb380..10adcdd 100644
> > --- a/drivers/thermal/user_space.c
> > +++ b/drivers/thermal/user_space.c
> > @@ -22,9 +22,6 @@
> > *
> > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> > ~~~~~~~~~~~~~~~~
> > */
> >
> > -#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
> > -
> > -#include <linux/module.h>
> > #include <linux/thermal.h>
> >
> > #include "thermal_core.h"
> > @@ -46,23 +43,15 @@ static int notify_user_space(struct
> > thermal_zone_device *tz, int trip)
> > static struct thermal_governor thermal_gov_user_space = {
> > .name = "user_space",
> > .throttle = notify_user_space,
> > - .owner = THIS_MODULE,
> > };
> >
> > -static int __init thermal_gov_user_space_init(void)
> > +int thermal_gov_user_space_register(void)
> > {
> > return thermal_register_governor(&thermal_gov_user_space);
> > }
> >
> > -static void __exit thermal_gov_user_space_exit(void)
> > +void thermal_gov_user_space_unregister(void)
> > {
> > thermal_unregister_governor(&thermal_gov_user_space);
> > }
> >
> > -/* This should load after thermal framework */
> > -fs_initcall(thermal_gov_user_space_init);
> > -module_exit(thermal_gov_user_space_exit);
> > -
> > -MODULE_AUTHOR("Durgadoss R");
> > -MODULE_DESCRIPTION("A user space Thermal notifier");
> > -MODULE_LICENSE("GPL");
> > diff --git a/include/linux/thermal.h b/include/linux/thermal.h
> > index f0bd7f9..2eeec01 100644
> > --- a/include/linux/thermal.h
> > +++ b/include/linux/thermal.h
> > @@ -184,7 +184,6 @@ struct thermal_governor {
> > char name[THERMAL_NAME_LENGTH];
> > int (*throttle)(struct thermal_zone_device *tz, int trip);
> > struct list_head governor_list;
> > - struct module *owner;
> > };
> >
> > /* Structure that holds binding parameters for a zone */
> > --
> > 1.7.9.5
>
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