linux-kernel - Re: [PATCH] hwmon: rpi: fix link error against rpi

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Date:   Mon, 9 Jul 2018 08:55:09 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Jean Delvare <jdelvare@...e.com>,
        Stefan Wahren <stefan.wahren@...e.com>,
        Eric Anholt <eric@...olt.net>,
        Vadim Pasternak <vadimp@...lanox.com>,
        linux-hwmon@...r.kernel.org, linux-kernel@...r.kernel.org,
        Florian Fainelli <f.fainelli@...il.com>
Subject: Re: [PATCH] hwmon: rpi: fix link error against rpi_firmware module

On Mon, Jul 09, 2018 at 05:42:44PM +0200, Arnd Bergmann wrote:
> Compile-testing without CONFIG_RASPBERRYPI_FIRMWARE is possible, but we
> cannot build the rpi hwmon driver into the kernel if the firmware code
> is a loadable module:
> 
> drivers/hwmon/raspberrypi-hwmon.o: In function `rpi_hwmon_probe':
> raspberrypi-hwmon.c:(.text+0x140): undefined reference to `rpi_firmware_property'
> drivers/hwmon/raspberrypi-hwmon.o: In function `get_values_poll':
> raspberrypi-hwmon.c:(.text+0x350): undefined reference to `rpi_firmware_property'
> 
> This adapts the dependency to disallow that combination.
> 
> Fixes: 3c493c885cf8 ("hwmon: Add support for RPi voltage sensor")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>

Acked-by: Guenter Roeck <linux@...ck-us.net>

This will have to go through Florian's tree.

Guenter

> ---
>  drivers/hwmon/Kconfig | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
> index a4e5d3c9fc71..81da17a42dc9 100644
> --- a/drivers/hwmon/Kconfig
> +++ b/drivers/hwmon/Kconfig
> @@ -1322,7 +1322,7 @@ config SENSORS_PWM_FAN
>  
>  config SENSORS_RASPBERRYPI_HWMON
>  	tristate "Raspberry Pi voltage monitor"
> -	depends on RASPBERRYPI_FIRMWARE || COMPILE_TEST
> +	depends on RASPBERRYPI_FIRMWARE || (COMPILE_TEST && !RASPBERRYPI_FIRMWARE)

Is that one of the situations where "imply RASPBERRYPI_FIRMWARE"
would be useful ?

>  	help
>  	  If you say yes here you get support for voltage sensor on the
>  	  Raspberry Pi.
> -- 
> 2.9.0
>