[asahilinux:bits/180-sio 2/4] drivers/dma/apple-sio.c:512:5: warning: variable 'param' set but not used

[kernel test robot <lkp@intel.com>]

tree:   https://github.com/AsahiLinux/linux bits/180-sio
head:   bdf5443483813f581ab80ea5e4a6b675ec2c211f
commit: b84a7086d959ffdb1184c2022e5e0f0941467055 [2/4] dmaengine: apple-sio: Add Apple SIO driver
config: x86_64-allyesconfig (https://download.01.org/0day-ci/archive/20241117/202411171547.QP5TMxtb-lkp@intel.com/config)
compiler: clang version 19.1.3 (https://github.com/llvm/llvm-project ab51eccf88f5321e7c60591c5546b254b6afab99)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20241117/202411171547.QP5TMxtb-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/202411171547.QP5TMxtb-lkp@intel.com/

All warnings (new ones prefixed by >>):

   In file included from drivers/dma/apple-sio.c:12:
   In file included from include/linux/dma-mapping.h:11:
   In file included from include/linux/scatterlist.h:8:
   In file included from include/linux/mm.h:2232:
   include/linux/vmstat.h:503:43: warning: arithmetic between different enumeration types ('enum zone_stat_item' and 'enum numa_stat_item') [-Wenum-enum-conversion]
     503 |         return vmstat_text[NR_VM_ZONE_STAT_ITEMS +
         |                            ~~~~~~~~~~~~~~~~~~~~~ ^
     504 |                            item];
         |                            ~~~~
   include/linux/vmstat.h:510:43: warning: arithmetic between different enumeration types ('enum zone_stat_item' and 'enum numa_stat_item') [-Wenum-enum-conversion]
     510 |         return vmstat_text[NR_VM_ZONE_STAT_ITEMS +
         |                            ~~~~~~~~~~~~~~~~~~~~~ ^
     511 |                            NR_VM_NUMA_EVENT_ITEMS +
         |                            ~~~~~~~~~~~~~~~~~~~~~~
   include/linux/vmstat.h:517:36: warning: arithmetic between different enumeration types ('enum node_stat_item' and 'enum lru_list') [-Wenum-enum-conversion]
     517 |         return node_stat_name(NR_LRU_BASE + lru) + 3; // skip "nr_"
         |                               ~~~~~~~~~~~ ^ ~~~
   include/linux/vmstat.h:523:43: warning: arithmetic between different enumeration types ('enum zone_stat_item' and 'enum numa_stat_item') [-Wenum-enum-conversion]
     523 |         return vmstat_text[NR_VM_ZONE_STAT_ITEMS +
         |                            ~~~~~~~~~~~~~~~~~~~~~ ^
     524 |                            NR_VM_NUMA_EVENT_ITEMS +
         |                            ~~~~~~~~~~~~~~~~~~~~~~
>> drivers/dma/apple-sio.c:512:5: warning: variable 'param' set but not used [-Wunused-but-set-variable]
     512 |         u8 param, type, tag, sioep;
         |            ^
   5 warnings generated.


vim +/param +512 drivers/dma/apple-sio.c

   506	
   507	static void sio_recv_msg(void *cookie, u8 ep, u64 msg)
   508	{
   509		struct sio_data *sio = cookie;
   510		struct sio_tagdata *tags = &sio->tags;
   511		u32 data;
 > 512		u8 param, type, tag, sioep;
   513	
   514		if (ep != EP_SIO)
   515			goto unknown;
   516	
   517		data  = FIELD_GET(SIOMSG_DATA, msg);
   518		param = FIELD_GET(SIOMSG_PARAM, msg);
   519		type  = FIELD_GET(SIOMSG_TYPE, msg);
   520		tag   = FIELD_GET(SIOMSG_TAG, msg);
   521		sioep = FIELD_GET(SIOMSG_EP, msg);
   522	
   523		switch (type) {
   524		case MSG_STARTED:
   525			dev_info(sio->dev, "SIO protocol v%u\n", data);
   526			type = MSG_ACK; /* Pretend this is an ACK */
   527			fallthrough;
   528		case MSG_ACK:
   529		case MSG_NACK:
   530			if (WARN_ON(tag >= SIO_NTAGS))
   531				break;
   532	
   533			if (tags->atomic[tag]) {
   534				sio_ack_callback callback = tags->ack_callback[tag];
   535	
   536				if (callback && !WARN_ON(sioep >= sio->nchannels))
   537					callback(&sio->channels[sioep],
   538						 tags->cookie[tag], type == MSG_ACK);
   539				if (type == MSG_NACK)
   540					dev_err(sio->dev, "got a NACK on channel %d\n", sioep);
   541				sio_free_tag(sio, tag);
   542			} else {
   543				tags->acked[tag] = (type == MSG_ACK);
   544				complete(&tags->completions[tag]);
   545			}
   546			break;
   547	
   548		case MSG_REPORT:
   549			if (WARN_ON(sioep >= sio->nchannels))
   550				break;
   551	
   552			sio_process_report(&sio->channels[sioep]);
   553			break;
   554	
   555		default:
   556			goto unknown;
   557		}
   558		return;
   559	
   560	unknown:
   561		dev_warn(sio->dev, "received unknown message: ep %x data %016llx\n",
   562			 ep, msg);
   563	}
   564	

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