drivers/gpu/drm/amd/amdgpu/mes_v12_1.c:1352:74: warning: '%hhu' directive output may be truncated writing 1 byte into a region of size between 0 and 2

drivers/gpu/drm/amd/amdgpu/mes_v12_1.c:1352:74: warning: '%hhu' directive output may be truncated writing 1 byte into a region of size between 0 and 2

[kernel test robot]

Hi Jack,

FYI, the error/warning still remains.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   cee73b1e840c154f64ace682cb477c1ae2e29cc4
commit: e220edf2d6fd6dbf08fa93790809500a80217948 drm/amdgpu/mes_v12_1: initial support for mes_v12_1
date:   10 weeks ago
config: s390-allyesconfig (https://download.01.org/0day-ci/archive/20260214/202602140200.2bCDckFo-lkp@intel.com/config)
compiler: s390-linux-gcc (GCC) 15.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260214/202602140200.2bCDckFo-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/202602140200.2bCDckFo-lkp@intel.com/

All warnings (new ones prefixed by >>):

   drivers/gpu/drm/amd/amdgpu/mes_v12_1.c: In function 'mes_v12_1_sw_init':
>> drivers/gpu/drm/amd/amdgpu/mes_v12_1.c:1352:74: warning: '%hhu' directive output may be truncated writing 1 byte into a region of size between 0 and 2 [-Wformat-truncation=]
    1352 |         snprintf(ring->name, sizeof(ring->name), "mes_kiq_%hhu.%hhu.%hhu.%hhu",
         |                                                                          ^~~~
   In function 'mes_v12_1_kiq_ring_init',
       inlined from 'mes_v12_1_sw_init' at drivers/gpu/drm/amd/amdgpu/mes_v12_1.c:1425:9:
   drivers/gpu/drm/amd/amdgpu/mes_v12_1.c:1352:9: note: 'snprintf' output between 16 and 18 bytes into a destination of size 16
    1352 |         snprintf(ring->name, sizeof(ring->name), "mes_kiq_%hhu.%hhu.%hhu.%hhu",
         |         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    1353 |                  (unsigned char)xcc_id, (unsigned char)ring->me,
         |                  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    1354 |                  (unsigned char)ring->pipe, (unsigned char)ring->queue);
         |                  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~


vim +1352 drivers/gpu/drm/amd/amdgpu/mes_v12_1.c

  1326	
  1327	static int mes_v12_1_kiq_ring_init(struct amdgpu_device *adev, int xcc_id)
  1328	{
  1329		struct amdgpu_ring *ring;
  1330		int inst = MES_PIPE_INST(xcc_id, AMDGPU_MES_KIQ_PIPE);
  1331	
  1332		spin_lock_init(&adev->gfx.kiq[xcc_id].ring_lock);
  1333	
  1334		ring = &adev->gfx.kiq[xcc_id].ring;
  1335	
  1336		ring->me = 3;
  1337		ring->pipe = 1;
  1338		ring->queue = 0;
  1339		ring->xcc_id = xcc_id;
  1340		ring->vm_hub = AMDGPU_GFXHUB(xcc_id);
  1341	
  1342		ring->adev = NULL;
  1343		ring->ring_obj = NULL;
  1344		ring->use_doorbell = true;
  1345		ring->eop_gpu_addr = adev->mes.eop_gpu_addr[inst];
  1346		ring->no_scheduler = true;
  1347		ring->doorbell_index =
  1348			(adev->doorbell_index.mes_ring1 +
  1349			 xcc_id * adev->doorbell_index.xcc_doorbell_range)
  1350			<< 1;
  1351	
> 1352		snprintf(ring->name, sizeof(ring->name), "mes_kiq_%hhu.%hhu.%hhu.%hhu",
  1353			 (unsigned char)xcc_id, (unsigned char)ring->me,
  1354			 (unsigned char)ring->pipe, (unsigned char)ring->queue);
  1355	
  1356		return amdgpu_ring_init(adev, ring, 1024, NULL, 0,
  1357					AMDGPU_RING_PRIO_DEFAULT, NULL);
  1358	}
  1359	

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki