sound/soc/intel/skylake/skl.c:874: undefined reference to `snd_soc_hdac_hda_get_ops'

[kbuild test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   9ff01193a20d391e8dbce4403dd5ef87c7eaaca6
commit: 6bae5ea9498926440ffc883f3dbceb0adc65e492 ASoC: hdac_hda: add asoc extension for legacy HDA codec drivers
date:   3 months ago
config: i386-randconfig-x078-11191627 (attached as .config)
compiler: gcc-7 (Debian 7.3.0-1) 7.3.0
reproduce:
        git checkout 6bae5ea9498926440ffc883f3dbceb0adc65e492
        # save the attached .config to linux build tree
        make ARCH=i386 

All errors (new ones prefixed by >>):

   sound/soc/intel/skylake/skl.o: In function `skl_create':
>> sound/soc/intel/skylake/skl.c:874: undefined reference to `snd_soc_hdac_hda_get_ops'

vim +874 sound/soc/intel/skylake/skl.c

   844	
   845	/*
   846	 * constructor
   847	 */
   848	static int skl_create(struct pci_dev *pci,
   849			      const struct hdac_io_ops *io_ops,
   850			      struct skl **rskl)
   851	{
   852		struct hdac_ext_bus_ops *ext_ops = NULL;
   853		struct skl *skl;
   854		struct hdac_bus *bus;
   855		struct hda_bus *hbus;
   856		int err;
   857	
   858		*rskl = NULL;
   859	
   860		err = pci_enable_device(pci);
   861		if (err < 0)
   862			return err;
   863	
   864		skl = devm_kzalloc(&pci->dev, sizeof(*skl), GFP_KERNEL);
   865		if (!skl) {
   866			pci_disable_device(pci);
   867			return -ENOMEM;
   868		}
   869	
   870		hbus = skl_to_hbus(skl);
   871		bus = skl_to_bus(skl);
   872	
   873	#if IS_ENABLED(CONFIG_SND_SOC_HDAC_HDA)
 > 874		ext_ops = snd_soc_hdac_hda_get_ops();
   875	#endif
   876		snd_hdac_ext_bus_init(bus, &pci->dev, &bus_core_ops, io_ops, ext_ops);
   877		bus->use_posbuf = 1;
   878		skl->pci = pci;
   879		INIT_WORK(&skl->probe_work, skl_probe_work);
   880		bus->bdl_pos_adj = 0;
   881	
   882		mutex_init(&hbus->prepare_mutex);
   883		hbus->pci = pci;
   884		hbus->mixer_assigned = -1;
   885		hbus->modelname = "sklbus";
   886	
   887		*rskl = skl;
   888	
   889		return 0;
   890	}
   891	

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