tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   f6e1ea19649216156576aeafa784e3b4cee45549
commit: a115ab9b8b93e7f0ff28a4fc869a3222ae921edd ASoC: SOF: Intel: add build support for SoundWire
date:   4 months ago
config: i386-randconfig-s031-20201231 (attached as .config)
compiler: gcc-9 (Debian 9.3.0-15) 9.3.0
reproduce:
        # apt-get install sparse
        # sparse version: v0.6.3-184-g1b896707-dirty
        # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=a115ab9b8b93e7f0ff28a4fc869a3222ae921edd
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout a115ab9b8b93e7f0ff28a4fc869a3222ae921edd
        # save the attached .config to linux build tree
        make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=i386 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All errors (new ones prefixed by >>):

   ld: sound/hda/intel-dsp-config.o: in function `snd_intel_dsp_check_soundwire':
>> sound/hda/intel-dsp-config.c:360: undefined reference to `sdw_intel_acpi_scan'


vim +360 sound/hda/intel-dsp-config.c

82d9d54a6c0ee8b Jaroslav Kysela      2019-10-22  350  
0650857570d1614 Pierre-Louis Bossart 2020-04-09  351  #if IS_ENABLED(CONFIG_SND_SOC_SOF_INTEL_SOUNDWIRE)
0650857570d1614 Pierre-Louis Bossart 2020-04-09  352  static int snd_intel_dsp_check_soundwire(struct pci_dev *pci)
0650857570d1614 Pierre-Louis Bossart 2020-04-09  353  {
0650857570d1614 Pierre-Louis Bossart 2020-04-09  354  	struct sdw_intel_acpi_info info;
0650857570d1614 Pierre-Louis Bossart 2020-04-09  355  	acpi_handle handle;
0650857570d1614 Pierre-Louis Bossart 2020-04-09  356  	int ret;
0650857570d1614 Pierre-Louis Bossart 2020-04-09  357  
0650857570d1614 Pierre-Louis Bossart 2020-04-09  358  	handle = ACPI_HANDLE(&pci->dev);
0650857570d1614 Pierre-Louis Bossart 2020-04-09  359  
0650857570d1614 Pierre-Louis Bossart 2020-04-09 @360  	ret = sdw_intel_acpi_scan(handle, &info);
0650857570d1614 Pierre-Louis Bossart 2020-04-09  361  	if (ret < 0)
0650857570d1614 Pierre-Louis Bossart 2020-04-09  362  		return ret;
0650857570d1614 Pierre-Louis Bossart 2020-04-09  363  
0650857570d1614 Pierre-Louis Bossart 2020-04-09  364  	return info.link_mask;
0650857570d1614 Pierre-Louis Bossart 2020-04-09  365  }
0650857570d1614 Pierre-Louis Bossart 2020-04-09  366  #else
0650857570d1614 Pierre-Louis Bossart 2020-04-09  367  static int snd_intel_dsp_check_soundwire(struct pci_dev *pci)
0650857570d1614 Pierre-Louis Bossart 2020-04-09  368  {
0650857570d1614 Pierre-Louis Bossart 2020-04-09  369  	return 0;
0650857570d1614 Pierre-Louis Bossart 2020-04-09  370  }
0650857570d1614 Pierre-Louis Bossart 2020-04-09  371  #endif
0650857570d1614 Pierre-Louis Bossart 2020-04-09  372  

:::::: The code at line 360 was first introduced by commit
:::::: 0650857570d161486a95d37bc8682628881ae2da ALSA: hda: add autodetection for SoundWire

:::::: TO: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
:::::: CC: Takashi Iwai <tiwai@suse.de>

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org