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Message-ID: <87o7jaythm.fsf@intel.com>
Date: Mon, 14 Aug 2023 10:26:45 +0300
From: Jani Nikula <jani.nikula@...ux.intel.com>
To: Wang Jinchao <wangjinchao@...sion.com>,
Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
Rodrigo Vivi <rodrigo.vivi@...el.com>,
Tvrtko Ursulin <tvrtko.ursulin@...ux.intel.com>,
David Airlie <airlied@...il.com>,
Daniel Vetter <daniel@...ll.ch>,
intel-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
linux-kernel@...r.kernel.org
Cc: stone.xulei@...sion.com
Subject: Re: [PATCH] drm/i915: Fix Kconfig error for CONFIG_DRM_I915
On Sat, 12 Aug 2023, Wang Jinchao <wangjinchao@...sion.com> wrote:
> When CONFIG_DRM_I915 is set to 'y' and CONFIG_BACKLIGHT_CLASS_DEVICE
> is set to 'm', we encountered an ld.lld error during the build process:
>
> ld.lld: error: undefined symbol: backlight_device_get_by_name
> >>> referenced by intel_backlight.c:955
> >>> vmlinux.o:(intel_backlight_device_register)
>
> ld.lld: error: undefined symbol: backlight_device_register
> >>> referenced by intel_backlight.c:971
> >>> vmlinux.o:(intel_backlight_device_register)
>
> ld.lld: error: undefined symbol: backlight_device_unregister
> >>> referenced by intel_backlight.c:999
> >>> vmlinux.o:(intel_backlight_device_unregister)
>
> This issue occurred because intel_backlight_device_register and
> intel_backlight_device_unregister were enclosed within
> However, according to Kconfig, CONFIG_DRM_I915 will select
> BACKLIGHT_CLASS_DEVICE only if ACPI is enabled.
> This led to an error, which can be resolved by removing the
> conditional statements related to ACPI.
The real fix is to use
depends on BACKLIGHT_CLASS_DEVICE || BACKLIGHT_CLASS_DEVICE=n
but in order to do that, you need to change a lot of places to depend
on, not select BACKLIGHT_CLASS_DEVICE, because otherwise you end up with
other dependency issues.
BR,
Jani.
>
> Signed-off-by: Wang Jinchao <wangjinchao@...sion.com>
> ---
> drivers/gpu/drm/i915/Kconfig | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/i915/Kconfig b/drivers/gpu/drm/i915/Kconfig
> index 01b5a8272a27..5003de921bf7 100644
> --- a/drivers/gpu/drm/i915/Kconfig
> +++ b/drivers/gpu/drm/i915/Kconfig
> @@ -24,7 +24,7 @@ config DRM_I915
> select IRQ_WORK
> # i915 depends on ACPI_VIDEO when ACPI is enabled
> # but for select to work, need to select ACPI_VIDEO's dependencies, ick
> - select BACKLIGHT_CLASS_DEVICE if ACPI
> + select BACKLIGHT_CLASS_DEVICE
> select INPUT if ACPI
> select X86_PLATFORM_DEVICES if ACPI
> select ACPI_WMI if ACPI
--
Jani Nikula, Intel Open Source Graphics Center
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