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* [PATCH] drm/i915: Fix Kconfig error for CONFIG_DRM_I915
@ 2023-08-12  9:19 Wang Jinchao
  2023-08-12  9:39 ` [PATCH v2] " Wang Jinchao
  2023-08-14  7:26 ` [PATCH] " Jani Nikula
  0 siblings, 2 replies; 7+ messages in thread
From: Wang Jinchao @ 2023-08-12  9:19 UTC (permalink / raw)
  To: Jani Nikula, Joonas Lahtinen, Rodrigo Vivi, Tvrtko Ursulin,
	David Airlie, Daniel Vetter, intel-gfx, dri-devel, linux-kernel
  Cc: stone.xulei

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.

Signed-off-by: Wang Jinchao <wangjinchao@xfusion.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
-- 
2.40.0


^ permalink raw reply related	[flat|nested] 7+ messages in thread

end of thread, other threads:[~2023-08-15  1:28 UTC | newest]

Thread overview: 7+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2023-08-12  9:19 [PATCH] drm/i915: Fix Kconfig error for CONFIG_DRM_I915 Wang Jinchao
2023-08-12  9:39 ` [PATCH v2] " Wang Jinchao
2023-08-14  7:26 ` [PATCH] " Jani Nikula
2023-08-14 12:07   ` Wang Jinchao
2023-08-14 12:13     ` Jani Nikula
2023-08-14 13:07       ` Wang Jinchao
2023-08-15  1:27       ` Wang Jinchao

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