From mboxrd@z Thu Jan  1 00:00:00 1970
From: Jani Nikula <jani.nikula@linux.intel.com>
Subject: Re: randconfig build error with next-20141001, in drivers/gpu/drm/i915
Date: Wed, 01 Oct 2014 20:57:43 +0300
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To: Jim Davis <jim.epost@gmail.com>, Stephen Rothwell <sfr@canb.auug.org.au>, linux-next <linux-next@vger.kernel.org>, linux-kernel <linux-kernel@vger.kernel.org>, David Airlie <airlied@linux.ie>, daniel.vetter@intel.com, intel-gfx@lists.freedesktop.org, dri-devel <dri-devel@lists.freedesktop.org>
List-Id: linux-next.vger.kernel.org

On Wed, 01 Oct 2014, Jim Davis <jim.epost@gmail.com> wrote:
> Building with the attached random configuration file,
>
> warning: (VIDEO_TIMBERDALE) selects TIMB_DMA which has unmet direct
> dependencies (DMADEVICES && MFD_TIMBERDALE)
> warning: (USB_OTG_FSM && FSL_USB2_OTG && USB_MV_OTG) selects USB_OTG
> which has unmet direct dependencies (USB_SUPPORT && USB && PM_RUNTIME)
>
> drivers/built-in.o: In function `intel_panel_setup_backlight':
> (.text+0x11855d): undefined reference to `backlight_device_register'
> drivers/built-in.o: In function `intel_panel_destroy_backlight':
> (.text+0x118624): undefined reference to `backlight_device_unregister'
> make: *** [vmlinux] Error 1

It's the combination:

> CONFIG_DRM_I915=y
> CONFIG_BACKLIGHT_CLASS_DEVICE=m

Not sure what the Kconfig magic spell needs to be when we don't want to
depend on CONFIG_BACKLIGHT_CLASS_DEVICE but we'll use it if it's enabled
(y or m).

BR,
Jani.


-- 
Jani Nikula, Intel Open Source Technology Center