linux-kernel - Re: 3.4.0+ - Linus GIT -- drivers/built-in.o: In function `nouveau_acpi_edid': (.text+0x112337): undefined reference to `acpi_video_get

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Message-ID: <5016C708.3090509@xenotime.net>
Date:	Mon, 30 Jul 2012 10:40:24 -0700
From:	Randy Dunlap <rdunlap@...otime.net>
To:	Miles Lane <miles.lane@...il.com>
CC:	LKML <linux-kernel@...r.kernel.org>,
	David Airlie <airlied@...ux.ie>,
	dri-devel@...ts.freedesktop.org
Subject: Re: 3.4.0+ - Linus GIT -- drivers/built-in.o: In function `nouveau_acpi_edid':
 (.text+0x112337): undefined reference to `acpi_video_get_edid'

On 05/31/2012 12:10 AM, Miles Lane wrote:

> I suspect this is due to a dependency not enforced in the Kconfig logic?
> 
>   LD      init/built-in.o
> drivers/built-in.o: In function `nouveau_acpi_edid':
> (.text+0x112337): undefined reference to `acpi_video_get_edid'




This build error still happens in Linux 3.5.
It is attempting to call a symbol in a loadable module from
a builtin driver.


CONFIG_ACPI_VIDEO=m
CONFIG_VIDEO_OUTPUT_CONTROL=m

If I use change CONFIG_VIDEO_OUTPUT_CONTROL to y,
CONFIG_ACPI_VIDEO also changes to y, so the relevant
functions are all builtin, and there is no build problem.


I guess that this line in drivers/gpu/drm/nouveau/Kconfig:

	select ACPI_VIDEO if ACPI && X86 && BACKLIGHT_CLASS_DEVICE && VIDEO_OUTPUT_CONTROL && INPUT

sets ACPI_VIDEO=m since VIDEO_OUTPUT_CONTROL=m, even though all of the
other symbols are =y.

xconfig tells me:

Selects: FW_LOADER [=y] && DRM_KMS_HELPER [=y] && DRM_TTM [=y] && FB_CFB_FILLRECT [=y] && FB_CFB_COPYAREA [=y] && FB_CFB_IMAGEBLIT [=y] && FB [=y] && FRAMEBUFFER_CONSOLE [=y] && FB_BACKLIGHT [=y] && ACPI_VIDEO [=m] && ACPI_WMI [=y] && MXM_WMI [=y] && POWER_SUPPLY [=y]




-- 
~Randy
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