[alsa-devel] [sound:topic/for-4.13 22/30] sound/core/pcm.c:905:3: error: implicit declaration of function 'pcm_call_notify'

[kbuild test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound.git topic/for-4.13
head:   c56407e6d958efda0d2a587ed89e02a251975e06
commit: e9a0fa885872c92e6ada08fb1cf3433945d235a3 [22/30] ALSA: pcm: Build pcm notifier code conditionally
config: x86_64-kexec (attached as .config)
compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901
reproduce:
        git checkout e9a0fa885872c92e6ada08fb1cf3433945d235a3
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All errors (new ones prefixed by >>):

   sound/core/pcm.c: In function 'snd_pcm_free':
>> sound/core/pcm.c:905:3: error: implicit declaration of function 'pcm_call_notify' [-Werror=implicit-function-declaration]
      pcm_call_notify(pcm, n_unregister);
      ^~~~~~~~~~~~~~~
>> sound/core/pcm.c:905:24: error: 'n_unregister' undeclared (first use in this function)
      pcm_call_notify(pcm, n_unregister);
                           ^~~~~~~~~~~~
   sound/core/pcm.c:905:24: note: each undeclared identifier is reported only once for each function it appears in
   sound/core/pcm.c: In function 'snd_pcm_dev_register':
>> sound/core/pcm.c:1118:23: error: 'n_register' undeclared (first use in this function)
     pcm_call_notify(pcm, n_register);
                          ^~~~~~~~~~
   sound/core/pcm.c: In function 'snd_pcm_dev_disconnect':
>> sound/core/pcm.c:1147:24: error: 'n_disconnect' undeclared (first use in this function)
      pcm_call_notify(pcm, n_disconnect);
                           ^~~~~~~~~~~~
   cc1: some warnings being treated as errors

vim +/pcm_call_notify +905 sound/core/pcm.c

   899	
   900	static int snd_pcm_free(struct snd_pcm *pcm)
   901	{
   902		if (!pcm)
   903			return 0;
   904		if (!pcm->internal)
 > 905			pcm_call_notify(pcm, n_unregister);
   906		if (pcm->private_free)
   907			pcm->private_free(pcm);
   908		snd_pcm_lib_preallocate_free_for_all(pcm);

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