linux-kernel - Re: [PATCH 1/1] thermal: fix compilation issue on CONFIG_THERMAL

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Date:	Tue, 7 Jan 2014 10:56:12 -0400
From:	Eduardo Valentin <eduardo.valentin@...com>
To:	Guenter Roeck <linux@...ck-us.net>
CC:	Eduardo Valentin <eduardo.valentin@...com>, <rui.zhang@...el.com>,
	<rdunlap@...radead.org>, Jean Delvare <khali@...ux-fr.org>,
	<linux-pm@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/1] thermal: fix compilation issue on CONFIG_THERMAL_OF
 dependencies

On 07-01-2014 10:33, Guenter Roeck wrote:
> On 01/07/2014 04:44 AM, Eduardo Valentin wrote:
>> Users of API provided by THERMAL_OF config may suffer when
>> CONFIG_THERMAL=y, causing linking issues, such as:
>>
>> drivers/built-in.o: In function `lm75_remove':
>> lm75.c:(.text+0x12bd8c): undefined reference to
>> `thermal_zone_of_sensor_unregister'
>> drivers/built-in.o: In function `lm75_probe':
>> lm75.c:(.text+0x12c123): undefined reference to
>> `thermal_zone_of_sensor_register'
>>
>> Therefore, this patch limits the compilation build to always
>> have THERMAL=y, whenever THERMAL_OF=y. In this way, whenever
>> the API user is built, if THERMAL_OF=y, the build shall have
>> the full thermal support, otherwise, the thermal API will provide
>> stubs.
>>
>> Cc: Zhang Rui <rui.zhang@...el.com>
>> Cc: Jean Delvare <khali@...ux-fr.org>
>> Cc: Guenter Roeck <linux@...ck-us.net>
>> Cc: linux-pm@...r.kernel.org
>> Cc: linux-kernel@...r.kernel.org
>> Reported-by: Randy Dunlap <rdunlap@...radead.org>
>> Signed-off-by: Eduardo Valentin <eduardo.valentin@...com>
>> ---
>>   drivers/thermal/Kconfig | 29 ++++++++++++++++-------------
>>   1 file changed, 16 insertions(+), 13 deletions(-)
>>
>> diff --git a/drivers/thermal/Kconfig b/drivers/thermal/Kconfig
>> index 58f98bd..dc315e9 100644
>> --- a/drivers/thermal/Kconfig
>> +++ b/drivers/thermal/Kconfig
>> @@ -29,19 +29,6 @@ config THERMAL_HWMON
>>         Say 'Y' here if you want all thermal sensors to
>>         have hwmon sysfs interface too.
>>
>> -config THERMAL_OF
>> -    bool
>> -    prompt "APIs to parse thermal data out of device tree"
>> -    depends on OF
>> -    default y
>> -    help
>> -      This options provides helpers to add the support to
>> -      read and parse thermal data definitions out of the
>> -      device tree blob.
>> -
>> -      Say 'Y' here if you need to build thermal infrastructure
>> -      based on device tree.
>> -
>>   choice
>>       prompt "Default Thermal governor"
>>       default THERMAL_DEFAULT_GOV_STEP_WISE
>> @@ -235,3 +222,19 @@ source "drivers/thermal/samsung/Kconfig"
>>   endmenu
>>
>>   endif
>> +
>> +menuconfig THERMAL_OF
>> +    bool
>> +    prompt "APIs to parse thermal data out of device tree"
>> +    depends on OF
>> +    select THERMAL
>> +    default y
>> +    help
>> +      This options enables DT thermal API which adds support to
>> +      read and parse thermal data definitions out of the
>> +      device tree blob. This option is mostly used by embedded
>> +      thermal drivers.
>> +
>> +      Say 'Y' here if you need to build thermal infrastructure
>> +      based on device tree.
>> +
>>
> 
> Alternative would be something like
> 
> diff --git a/include/linux/thermal.h b/include/linux/thermal.h
> index f7e11c7..156bb4d 100644
> --- a/include/linux/thermal.h
> +++ b/include/linux/thermal.h
> @@ -244,7 +244,7 @@ struct thermal_genl_event {
>  };
> 
>  /* Function declarations */
> -#ifdef CONFIG_THERMAL_OF
> +#if defined(CONFIG_THERMAL_OF) && (defined(CONFIG_THERMAL) ||
> (defined(MODULE) && defined(CONFIG_THERMAL_MODULE)))

I think this is a weak fix, as it would mean that we would providing
stubs if thermal is compiled as module.

>  struct thermal_zone_device *
>  thermal_zone_of_sensor_register(struct device *dev, int id,
>                                 void *data, int (*get_temp)(void *, long
> *),
> 
> but your patch should work as well (or even better as it won't cause
> confusion).
> 
> Guenter
> 
> 
> 


-- 
You have got to be excited about what you are doing. (L. Lamport)

Eduardo Valentin


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