[i915] Kernel does not compile when set to use i915 kernel mode-setting per default (CONFIG_DRM_I915_KMS=y)

From: Len Brown <len.brown@intel.com>

Woody Suwalski wrote:
> Randy Dunlap wrote:
>> Woody Suwalski wrote:
>>  
>>> Rafael J. Wysocki wrote:
>>>    
>>>> On Monday 18 May 2009, Randy Dunlap wrote:
>>>>  
>>>>      
>>>>> On Mon, 18 May 2009 21:01:06 +0200 Rafael J. Wysocki wrote:
>>>>>
>>>>>           
>>>>>> Adding CCs.
>>>>>>
>>>>>> On Monday 18 May 2009, you wrote:
>>>>>>               
>>>>>>> (First post, so please CC to zorael@gmail.com in case it doesn't
>>>>>>> automatically.)
>>>>>>>
>>>>>>>
>>>>>>> I'm trying to compile 2.6.30-rc6 to enable kernel mode-setting *per
>>>>>>> default*, for my Intel 945GME video chipset. Alas, when
>>>>>>> compiling, it
>>>>>>> halts with the following tidbit:
>>>>>>>
>>>>>>> ...
>>>>>>>   LD      .tmp_vmlinux1
>>>>>>> drivers/built-in.o: In function `intel_opregion_free':
>>>>>>> /usr/src/linux/drivers/gpu/drm/i915/i915_opregion.c:422: undefined
>>>>>>> reference to `acpi_video_exit'
>>>>>>> drivers/built-in.o: In function `intel_opregion_init':
>>>>>>> /usr/src/linux/drivers/gpu/drm/i915/i915_opregion.c:393: undefined
>>>>>>> reference to `acpi_video_register'
>>>>>>> make[1]: *** [.tmp_vmlinux1] Error 1
>>>>>>> make[1]: Leaving directory `/usr/src/linux-2.6.29'
>>>>>>> make: *** [debian/stamp/build/kernel] Error 2
>>>>>>>
>>>>>>>
>>>>>>> grepping acpi_video_register recursively I see it's defined as an
>>>>>>> empty function in ./include/acpi/video.h, and as a more proper
>>>>>>> function in ./drivers/acpi/video.c. Does somehow setting it to
>>>>>>> use KMS
>>>>>>> per default via CONFIG_DRM_I915_KMS=y stop it from reading those
>>>>>>> files?
>>>>>>>
>>>>>>> I used to run with KMS by default in the early -30rc*s, but at some
>>>>>>> point (rc2?), it stopped compiling succesfully. If I don't enable it
>>>>>>> per default, it *does* compile, though I don't know how to
>>>>>>> explicitly
>>>>>>> enable it at boot-time. So I'm living without KMS for the time
>>>>>>> being.
>>>>>>> Woe.
>>>>>>>
>>>>>>> Anything obvious I'm doing wrong?
>>>>>>>                     
>>>>> Len posted a patch for this.  It's below.
>>>>> Len, do you have this patch queued for Linus?
>>>>>             
>>>> Ah, it's commit ecb4aed78dcf09e48c8c34c8c2fa7f5c69344be6, which went in
>>>> slightly after -rc6.  So it should be fixed.
>>>>
>>>> Zorael, please test the current Linus' tree.
>>>>
>>>>         
>>> Len's patch idea does not work for me - if ACPI is build as a module, I
>>> have no way to force acpi-video to be built in.
>>> And kernel with i915 built-in breaks...
>>> So to summarize: acpi=m with i915=y is broken...
>>>
>>> For now I am simply commenting-out the i915 acpi-video calls, but that
>>> is not a good way...
>>> We need to move the core acpi-video to the main kernel...
>>>     
>>
>> Please post your troublesome kernel .config file.
>>
>> Thanks,
>>   
> Certainly...
> Here it is inlined:

Thanks.  If Len's patch is moved to apply to DRM_I915 instead of to
DRM_I915_KMS, it works for me, but I'll leave it to Len to decide
if that's the right or wrong thing to do.

---

From: Len Brown <len.brown@intel.com>
Subject: [PATCH] ACPI, i915: build fix

drivers/built-in.o: In function `intel_opregion_init':
(.text+0x9d540): undefined reference to `acpi_video_register'

Signed-off-by: Len Brown <len.brown@intel.com>
Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com>
---
 drivers/gpu/drm/Kconfig |    8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

[i915] Kernel does not compile when set to use i915 kernel mode-setting per default (CONFIG_DRM_I915_KMS=y)

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