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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