linux-kernel - Re: [PATCH 1/7] thermal/drivers/core: Remove the module Kconfig's option

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Date:   Tue, 23 Apr 2019 08:52:10 -0700
From:   Eduardo Valentin <edubezval@...il.com>
To:     Daniel Lezcano <daniel.lezcano@...aro.org>
Cc:     rui.zhang@...el.com, linux-pm@...r.kernel.org,
        linux-kernel@...r.kernel.org, Guenter Roeck <groeck@...omium.org>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Russell King <linux@...linux.org.uk>,
        Ralf Baechle <ralf@...ux-mips.org>,
        Paul Burton <paul.burton@...s.com>,
        James Hogan <jhogan@...nel.org>, Guan Xuetao <gxt@....edu.cn>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Alexey Brodkin <alexey.brodkin@...opsys.com>,
        Robert Jarzmik <robert.jarzmik@...e.fr>,
        Arnd Bergmann <arnd@...db.de>,
        Enric Balletbo i Serra <enric.balletbo@...labora.com>,
        Daniel Mack <daniel@...que.org>,
        "moderated list:ARM PORT" <linux-arm-kernel@...ts.infradead.org>,
        "open list:MIPS" <linux-mips@...r.kernel.org>
Subject: Re: [PATCH 1/7] thermal/drivers/core: Remove the module Kconfig's
 option

Hello,

On Tue, Apr 02, 2019 at 06:12:44PM +0200, Daniel Lezcano wrote:
> The module support for the thermal subsystem makes little sense:
>  - some subsystems relying on it are not modules, thus forcing the
>    framework to be compiled in
>  - it is compiled in for almost every configs, the remaining ones
>    are a few platforms where I don't see why we can not switch the thermal
>    to 'y'. The drivers can stay in tristate.
>  - platforms need the thermal to be ready as soon as possible at boot time
>    in order to mitigate
> 
> Usually the subsystems framework are compiled-in and the plugs are as module.
> 
> Remove the module option. The removal of the module related dead code will
> come after this patch gets in or is acked.


I remember some buzilla entry around this some time back.

Rui, do you remember why you made this to be module?

I dont have strong opinion here, but I would like to see
a better description why we are going this direction rather
than "most people dont use it as module". Was there any particular
specific technical motivation?


> 
> Signed-off-by: Daniel Lezcano <daniel.lezcano@...aro.org>
> Acked-by: Guenter Roeck <groeck@...omium.org>
> For mini2440:
> Acked-by: Krzysztof Kozlowski <krzk@...nel.org>
> ---
>  arch/arm/configs/mini2440_defconfig        | 2 +-
>  arch/arm/configs/pxa_defconfig             | 2 +-
>  arch/mips/configs/ip22_defconfig           | 2 +-
>  arch/mips/configs/ip27_defconfig           | 2 +-
>  arch/unicore32/configs/unicore32_defconfig | 2 +-
>  drivers/thermal/Kconfig                    | 4 ++--
>  6 files changed, 7 insertions(+), 7 deletions(-)
> 
> diff --git a/arch/arm/configs/mini2440_defconfig b/arch/arm/configs/mini2440_defconfig
> index d95a8059d30b..0cf1c120c4bb 100644
> --- a/arch/arm/configs/mini2440_defconfig
> +++ b/arch/arm/configs/mini2440_defconfig
> @@ -152,7 +152,7 @@ CONFIG_SPI_S3C24XX=y
>  CONFIG_SPI_SPIDEV=y
>  CONFIG_GPIO_SYSFS=y
>  CONFIG_SENSORS_LM75=y
> -CONFIG_THERMAL=m
> +CONFIG_THERMAL=y
>  CONFIG_WATCHDOG=y
>  CONFIG_S3C2410_WATCHDOG=y
>  CONFIG_FB=y
> diff --git a/arch/arm/configs/pxa_defconfig b/arch/arm/configs/pxa_defconfig
> index d4654755b09c..d4f9dda3a52f 100644
> --- a/arch/arm/configs/pxa_defconfig
> +++ b/arch/arm/configs/pxa_defconfig
> @@ -387,7 +387,7 @@ CONFIG_SENSORS_LM75=m
>  CONFIG_SENSORS_LM90=m
>  CONFIG_SENSORS_LM95245=m
>  CONFIG_SENSORS_NTC_THERMISTOR=m
> -CONFIG_THERMAL=m
> +CONFIG_THERMAL=y
>  CONFIG_WATCHDOG=y
>  CONFIG_XILINX_WATCHDOG=m
>  CONFIG_SA1100_WATCHDOG=m
> diff --git a/arch/mips/configs/ip22_defconfig b/arch/mips/configs/ip22_defconfig
> index ff40fbc2f439..21a1168ae301 100644
> --- a/arch/mips/configs/ip22_defconfig
> +++ b/arch/mips/configs/ip22_defconfig
> @@ -228,7 +228,7 @@ CONFIG_SERIAL_IP22_ZILOG=m
>  # CONFIG_HW_RANDOM is not set
>  CONFIG_RAW_DRIVER=m
>  # CONFIG_HWMON is not set
> -CONFIG_THERMAL=m
> +CONFIG_THERMAL=y
>  CONFIG_WATCHDOG=y
>  CONFIG_INDYDOG=m
>  # CONFIG_VGA_CONSOLE is not set
> diff --git a/arch/mips/configs/ip27_defconfig b/arch/mips/configs/ip27_defconfig
> index 81c47e18131b..54db5dedf776 100644
> --- a/arch/mips/configs/ip27_defconfig
> +++ b/arch/mips/configs/ip27_defconfig
> @@ -271,7 +271,7 @@ CONFIG_I2C_PARPORT_LIGHT=m
>  CONFIG_I2C_TAOS_EVM=m
>  CONFIG_I2C_STUB=m
>  # CONFIG_HWMON is not set
> -CONFIG_THERMAL=m
> +CONFIG_THERMAL=y
>  CONFIG_MFD_PCF50633=m
>  CONFIG_PCF50633_ADC=m
>  CONFIG_PCF50633_GPIO=m
> diff --git a/arch/unicore32/configs/unicore32_defconfig b/arch/unicore32/configs/unicore32_defconfig
> index aebd01fc28e5..360cc9abcdb0 100644
> --- a/arch/unicore32/configs/unicore32_defconfig
> +++ b/arch/unicore32/configs/unicore32_defconfig
> @@ -119,7 +119,7 @@ CONFIG_I2C_PUV3=y
>  #	Hardware Monitoring support
>  #CONFIG_SENSORS_LM75=m
>  #	Generic Thermal sysfs driver
> -#CONFIG_THERMAL=m
> +#CONFIG_THERMAL=y
>  #CONFIG_THERMAL_HWMON=y
>  
>  #	Multimedia support
> diff --git a/drivers/thermal/Kconfig b/drivers/thermal/Kconfig
> index 653aa27a25a4..ccf5b9408d7a 100644
> --- a/drivers/thermal/Kconfig
> +++ b/drivers/thermal/Kconfig
> @@ -3,7 +3,7 @@
>  #
>  
>  menuconfig THERMAL
> -	tristate "Generic Thermal sysfs driver"
> +	bool "Generic Thermal sysfs driver"
>  	help
>  	  Generic Thermal Sysfs driver offers a generic mechanism for
>  	  thermal management. Usually it's made up of one or more thermal
> @@ -11,7 +11,7 @@ menuconfig THERMAL
>  	  Each thermal zone contains its own temperature, trip points,
>  	  cooling devices.
>  	  All platforms with ACPI thermal support can use this driver.
> -	  If you want this support, you should say Y or M here.
> +	  If you want this support, you should say Y here.
>  
>  if THERMAL
>  
> -- 
> 2.17.1
>