[sound:test/usb-hacks-wip 44/53] sound/usb/endpoint.c:1255:5: warning: no previous prototype for function 'snd_usb_sync_endpoint_start'

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound.git test/usb-hacks-wip
head:   8d9dd7caccc6daebab8b2a1a7bbd09e605b83fba
commit: ca31918f6843b5369d0c900c43bfe5f71441b5b2 [44/53] ALSA: usb-audio: Refactor endpoint management
config: x86_64-randconfig-a001-20201115 (attached as .config)
compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project 9a85643cd357e412cff69067bb5c4840e228c2ab)
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # install x86_64 cross compiling tool for clang build
        # apt-get install binutils-x86-64-linux-gnu
        # https://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound.git/commit/?id=ca31918f6843b5369d0c900c43bfe5f71441b5b2
        git remote add sound https://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound.git
        git fetch --no-tags sound test/usb-hacks-wip
        git checkout ca31918f6843b5369d0c900c43bfe5f71441b5b2
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=x86_64 

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

All warnings (new ones prefixed by >>):

>> sound/usb/endpoint.c:1255:5: warning: no previous prototype for function 'snd_usb_sync_endpoint_start' [-Wmissing-prototypes]
   int snd_usb_sync_endpoint_start(struct snd_usb_endpoint *ep,
       ^
   sound/usb/endpoint.c:1255:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   int snd_usb_sync_endpoint_start(struct snd_usb_endpoint *ep,
   ^
   static 
>> sound/usb/endpoint.c:1298:6: warning: no previous prototype for function 'snd_usb_sync_endpoint_stop' [-Wmissing-prototypes]
   void snd_usb_sync_endpoint_stop(struct snd_usb_endpoint *ep)
        ^
   sound/usb/endpoint.c:1298:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   void snd_usb_sync_endpoint_stop(struct snd_usb_endpoint *ep)
   ^
   static 
   2 warnings generated.

vim +/snd_usb_sync_endpoint_start +1255 sound/usb/endpoint.c

  1254	
> 1255	int snd_usb_sync_endpoint_start(struct snd_usb_endpoint *ep,
  1256					struct snd_usb_endpoint *data_ep)
  1257	{
  1258		int err;
  1259	
  1260		err = snd_usb_endpoint_start(ep);
  1261		return err;
  1262	}
  1263	
  1264	/**
  1265	 * snd_usb_endpoint_stop: stop an snd_usb_endpoint
  1266	 *
  1267	 * @ep: the endpoint to stop (may be NULL)
  1268	 *
  1269	 * A call to this function will decrement the use count of the endpoint.
  1270	 * In case the last user has requested the endpoint stop, the URBs will
  1271	 * actually be deactivated.
  1272	 *
  1273	 * Must be balanced to calls of snd_usb_endpoint_start().
  1274	 *
  1275	 * The caller needs to synchronize the pending stop operation via
  1276	 * snd_usb_endpoint_sync_pending_stop().
  1277	 */
  1278	void snd_usb_endpoint_stop(struct snd_usb_endpoint *ep)
  1279	{
  1280		if (!ep)
  1281			return;
  1282	
  1283		usb_audio_dbg(ep->chip, "Stopping %s EP 0x%x (count %d)\n",
  1284			      ep_type_name(ep->type), ep->ep_num, ep->use_count);
  1285	
  1286		if (snd_BUG_ON(ep->use_count == 0))
  1287			return;
  1288	
  1289		if (ep->sync_master)
  1290			WRITE_ONCE(ep->sync_master->sync_slave, NULL);
  1291	
  1292		if (--ep->use_count == 0) {
  1293			deactivate_urbs(ep, false);
  1294			set_bit(EP_FLAG_STOPPING, &ep->flags);
  1295		}
  1296	}
  1297	
> 1298	void snd_usb_sync_endpoint_stop(struct snd_usb_endpoint *ep)
  1299	{
  1300		snd_usb_endpoint_stop(ep);
  1301	}
  1302	

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