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Date: Tue, 26 Mar 2013 16:53:07 +0000
From: "R, Durgadoss" <durgadoss.r@...el.com>
To: "Zhang, Rui" <rui.zhang@...el.com>,
"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC: "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
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].
A pr_err statement here, saying the registration failed,
would help us a lot.
> + 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.
> +
> + 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..
> +
> 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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