linux-kernel - Re: sound/soc/intel/boards/hda_dsp_common.c:76: undefined reference to `snd_hda_codec_build

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Date:   Thu, 6 Feb 2020 12:01:24 -0600
From:   Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
To:     Takashi Iwai <tiwai@...e.de>, kbuild test robot <lkp@...el.com>
Cc:     Kai Vehmanen <kai.vehmanen@...ux.intel.com>,
        kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org,
        Mark Brown <broonie@...nel.org>
Subject: Re: sound/soc/intel/boards/hda_dsp_common.c:76: undefined reference
 to `snd_hda_codec_build_controls'


>>>     ld: sound/soc/intel/boards/hda_dsp_common.o: in function 
>>> `hda_dsp_hdmi_build_controls':
>>>>> sound/soc/intel/boards/hda_dsp_common.c:76: undefined reference to 
>>>>> `snd_hda_codec_build_controls'
>>
>> Looks like the revert select enforcing the built-in of SOF while the
>> legacy HDA is a module.  It doesn't look so trivial to fix...
> 
> SOF in this case is build as a module, but the machine driver isn't.
> 
> It seems like the SND_SOC_INTEL_SKL_HDA_DSP_GENERIC_MACH option is 
> different from others machine drivers. All others can only be either M 
> or not selected, but here we have a case where the selection can be M or y.

Suggested fix is here, running it through our CI tests for now:

https://github.com/thesofproject/linux/pull/1768

This should be caught by kbuild tests as well.