linux-kernel - Re: [PATCH] drm/etnaviv: add thermal dependency

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Date:   Sun, 23 Apr 2017 08:36:57 -0700
From:   Eduardo Valentin <edubezval@...il.com>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Lucas Stach <l.stach@...gutronix.de>,
        David Airlie <airlied@...ux.ie>,
        Zhang Rui <rui.zhang@...el.com>, linux-pm@...r.kernel.org,
        Sujith Thomas <sujith.thomas@...el.com>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Len Brown <lenb@...nel.org>,
        Russell King <linux+etnaviv@...linux.org.uk>,
        Christian Gmeiner <christian.gmeiner@...il.com>,
        Darren Hart <dvhart@...radead.org>,
        Andy Shevchenko <andy@...radead.org>,
        Daniel Vetter <daniel.vetter@...ll.ch>,
        linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org,
        etnaviv@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        platform-driver-x86@...r.kernel.org
Subject: Re: [PATCH] drm/etnaviv: add thermal dependency

On Wed, Apr 19, 2017 at 08:11:16PM +0200, Arnd Bergmann wrote:
> When CONFIG_THERMAL is enabled as a loadable module, and etnaviv is
> built-in, we get a link error:
> 
> drivers/gpu/drm/etnaviv/etnaviv_gpu.o: In function `etnaviv_gpu_bind':
> etnaviv_gpu.c:(.text.etnaviv_gpu_bind+0x34): undefined reference to `thermal_of_cooling_device_register'
> etnaviv_gpu.c:(.text.etnaviv_gpu_bind+0xe0): undefined reference to `thermal_cooling_device_unregister'
> drivers/gpu/drm/etnaviv/etnaviv_gpu.o: In function `etnaviv_gpu_unbind':
> etnaviv_gpu.c:(.text.etnaviv_gpu_unbind+0xf0): undefined reference to `thermal_cooling_device_unregister'
> 
> This adds a Kconfig dependency to prevent etnaviv from being built-in
> with CONFIG_THERMAL=m, while still allowing the valid configurations.
> Unfortunately, simply adding the dependency here breaks Kconfig through
> a dependency loop involving lots of symbols all the way until ACPI_VIDEO,
> which is the only video driver that explicitly selects 'THERMAL'. Turning
> this into a 'depends on' addresses the problem.
> For completeness, I'm also removing the redundant 'select THERMAL'
> from INTEL_MENLOW, so no other driver uses that statement.
> 
> Fixes: bcdfb5e56dc5 ("drm/etnaviv: add etnaviv cooling device")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>

Acked-by: Eduardo Valentin <edubezval@...il.com>

> ---
>  drivers/acpi/Kconfig            | 2 +-
>  drivers/gpu/drm/etnaviv/Kconfig | 1 +
>  drivers/platform/x86/Kconfig    | 1 -
>  3 files changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig
> index 03cc4e74096b..252399efa8b3 100644
> --- a/drivers/acpi/Kconfig
> +++ b/drivers/acpi/Kconfig
> @@ -184,7 +184,7 @@ config ACPI_VIDEO
>  	tristate "Video"
>  	depends on X86 && BACKLIGHT_CLASS_DEVICE
>  	depends on INPUT
> -	select THERMAL
> +	depends on THERMAL
>  	help
>  	  This driver implements the ACPI Extensions For Display Adapters
>  	  for integrated graphics devices on motherboard, as specified in
> diff --git a/drivers/gpu/drm/etnaviv/Kconfig b/drivers/gpu/drm/etnaviv/Kconfig
> index 71cee4e9fefb..1d6c744e7924 100644
> --- a/drivers/gpu/drm/etnaviv/Kconfig
> +++ b/drivers/gpu/drm/etnaviv/Kconfig
> @@ -3,6 +3,7 @@ config DRM_ETNAVIV
>  	tristate "ETNAVIV (DRM support for Vivante GPU IP cores)"
>  	depends on DRM
>  	depends on ARCH_MXC || ARCH_DOVE || (ARM && COMPILE_TEST)
> +	depends on THERMAL || THERMAL=n
>  	depends on MMU
>  	select SHMEM
>  	select SYNC_FILE
> diff --git a/drivers/platform/x86/Kconfig b/drivers/platform/x86/Kconfig
> index e229ea317b9c..76ced87efde5 100644
> --- a/drivers/platform/x86/Kconfig
> +++ b/drivers/platform/x86/Kconfig
> @@ -544,7 +544,6 @@ config SENSORS_HDAPS
>  config INTEL_MENLOW
>  	tristate "Thermal Management driver for Intel menlow platform"
>  	depends on ACPI_THERMAL
> -	select THERMAL
>  	---help---
>  	  ACPI thermal management enhancement driver on
>  	  Intel Menlow platform.
> -- 
> 2.9.0
> 

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