[asahilinux:bits/200-dcp 200/210] drivers/gpu/drm/apple/audio.c:413:6: warning: variable 'ret' set but not used

[asahilinux:bits/200-dcp 200/210] drivers/gpu/drm/apple/audio.c:413:6: warning: variable 'ret' set but not used

[kernel test robot]

tree:   https://github.com/AsahiLinux/linux bits/200-dcp
head:   38ae67fe4628d642a9dc626b9ba75bb2ac4bd701
commit: 35a895171434f74b9b12efa9c7c3251983586bde [200/210] gpu: drm: apple: Add DCP audio driver
config: arm64-allyesconfig (https://download.01.org/0day-ci/archive/20240504/202405040317.xJ6Ar8ue-lkp@intel.com/config)
compiler: clang version 19.0.0git (https://github.com/llvm/llvm-project 37ae4ad0eef338776c7e2cffb3896153d43dcd90)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240504/202405040317.xJ6Ar8ue-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202405040317.xJ6Ar8ue-lkp@intel.com/

All warnings (new ones prefixed by >>):

   In file included from drivers/gpu/drm/apple/audio.c:16:
   In file included from include/linux/of_dma.h:14:
   In file included from include/linux/dmaengine.h:12:
   In file included from include/linux/scatterlist.h:8:
   In file included from include/linux/mm.h:2188:
   include/linux/vmstat.h:508:43: warning: arithmetic between different enumeration types ('enum zone_stat_item' and 'enum numa_stat_item') [-Wenum-enum-conversion]
     508 |         return vmstat_text[NR_VM_ZONE_STAT_ITEMS +
         |                            ~~~~~~~~~~~~~~~~~~~~~ ^
     509 |                            item];
         |                            ~~~~
   include/linux/vmstat.h:515:43: warning: arithmetic between different enumeration types ('enum zone_stat_item' and 'enum numa_stat_item') [-Wenum-enum-conversion]
     515 |         return vmstat_text[NR_VM_ZONE_STAT_ITEMS +
         |                            ~~~~~~~~~~~~~~~~~~~~~ ^
     516 |                            NR_VM_NUMA_EVENT_ITEMS +
         |                            ~~~~~~~~~~~~~~~~~~~~~~
   include/linux/vmstat.h:522:36: warning: arithmetic between different enumeration types ('enum node_stat_item' and 'enum lru_list') [-Wenum-enum-conversion]
     522 |         return node_stat_name(NR_LRU_BASE + lru) + 3; // skip "nr_"
         |                               ~~~~~~~~~~~ ^ ~~~
   include/linux/vmstat.h:527:43: warning: arithmetic between different enumeration types ('enum zone_stat_item' and 'enum numa_stat_item') [-Wenum-enum-conversion]
     527 |         return vmstat_text[NR_VM_ZONE_STAT_ITEMS +
         |                            ~~~~~~~~~~~~~~~~~~~~~ ^
     528 |                            NR_VM_NUMA_EVENT_ITEMS +
         |                            ~~~~~~~~~~~~~~~~~~~~~~
   include/linux/vmstat.h:536:43: warning: arithmetic between different enumeration types ('enum zone_stat_item' and 'enum numa_stat_item') [-Wenum-enum-conversion]
     536 |         return vmstat_text[NR_VM_ZONE_STAT_ITEMS +
         |                            ~~~~~~~~~~~~~~~~~~~~~ ^
     537 |                            NR_VM_NUMA_EVENT_ITEMS +
         |                            ~~~~~~~~~~~~~~~~~~~~~~
   drivers/gpu/drm/apple/audio.c:207:16: error: call to undeclared function 'snd_interval_rate_bits'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
     207 |         return snd_interval_rate_bits(r, hits.rates);
         |                ^
>> drivers/gpu/drm/apple/audio.c:413:6: warning: variable 'ret' set but not used [-Wunused-but-set-variable]
     413 |         int ret;
         |             ^
   6 warnings and 1 error generated.


vim +/ret +413 drivers/gpu/drm/apple/audio.c

   407	
   408	
   409	static int dcpaud_create_chmap_ctl(struct dcp_audio *dcpaud)
   410	{
   411		struct snd_pcm *pcm = dcpaud->substream->pcm;
   412		struct snd_pcm_chmap *chmap_info;
 > 413		int ret;
   414	
   415		ret = snd_pcm_add_chmap_ctls(pcm, SNDRV_PCM_STREAM_PLAYBACK, NULL,
   416					     dcp_pcm_hw.channels_max, 0, &chmap_info);
   417	
   418		chmap_info->kctl->get = dcpaud_chmap_ctl_get;
   419		chmap_info->chmap = hdmi_codec_8ch_chmaps;
   420		chmap_info->private_data = dcpaud;
   421	
   422		return 0;
   423	}
   424	

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