[openeuler:OLK-6.6 3485/3485] drivers/net/ethernet/huawei/bma/kbox_drv/kbox_printk.c:281:57: warning: diagnostic behavior may be improved by adding the 'format(printf, 1, 2)' attribute to the declaration of 'kbox_dump_printk_info'

9 Dec 2025

      tree:   https://gitee.com/openeuler/kernel.git OLK-6.6
head:   36141432a37f7dedddde8825e724b07ce3a440fb
commit: cd2978286f40089fcd83f74ffdff733bfbe1e52a [3485/3485] Huawei BMA: Adding Huawei BMA driver: host_kbox_drv
config: loongarch-allyesconfig (https://download.01.org/0day-ci/archive/20251209/202512090240.NdebMvOZ-lkp@i...)
compiler: clang version 22.0.0git (https://github.com/llvm/llvm-project 000e46219ba1ee53fc42d35e00c314c2807e8b14)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251209/202512090240.NdebMvOZ-lkp@i...)

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/202512090240.NdebMvOZ-lkp@intel.com/

All warnings (new ones prefixed by >>):

   In file included from drivers/net/ethernet/huawei/bma/kbox_drv/kbox_printk.c:20:
   In file included from drivers/net/ethernet/huawei/bma/kbox_drv/kbox_include.h:21:
   In file included from include/linux/netdevice.h:38:
   In file included from include/net/net_namespace.h:43:
   In file included from include/linux/skbuff.h:17:
   In file included from include/linux/bvec.h:10:
   In file included from include/linux/highmem.h:8:
   In file included from include/linux/cacheflush.h:5:
   In file included from arch/loongarch/include/asm/cacheflush.h:8:
   In file included from include/linux/mm.h:2204:
   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/net/ethernet/huawei/bma/kbox_drv/kbox_printk.c:281:57: warning: diagnostic behavior may be improved by adding the 'format(printf, 1, 2)' attribute to the declaration of 'kbox_dump_printk_info' [-Wmissing-format-attribute]
     281 |         num = vsnprintf(tmp_buf, sizeof(tmp_buf) - 1, fmt, args);
         |                                                                ^
   drivers/net/ethernet/huawei/bma/kbox_drv/kbox_printk.h:30:6: note: 'kbox_dump_printk_info' declared here
      30 | int  kbox_dump_printk_info(const char *fmt, ...);
         |      ^
   6 warnings generated.
--
   In file included from drivers/net/ethernet/huawei/bma/kbox_drv/kbox_panic.c:20:
   In file included from drivers/net/ethernet/huawei/bma/kbox_drv/kbox_include.h:21:
   In file included from include/linux/netdevice.h:38:
   In file included from include/net/net_namespace.h:43:
   In file included from include/linux/skbuff.h:17:
   In file included from include/linux/bvec.h:10:
   In file included from include/linux/highmem.h:8:
   In file included from include/linux/cacheflush.h:5:
   In file included from arch/loongarch/include/asm/cacheflush.h:8:
   In file included from include/linux/mm.h:2204:
   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/net/ethernet/huawei/bma/kbox_drv/kbox_panic.c:85:57: warning: diagnostic behavior may be improved by adding the 'format(printf, 1, 2)' attribute to the declaration of 'kbox_dump_painc_info' [-Wmissing-format-attribute]
      85 |         num = vsnprintf(tmp_buf, sizeof(tmp_buf) - 1, fmt, args);
         |                                                                ^
   drivers/net/ethernet/huawei/bma/kbox_drv/kbox_panic.h:21:5: note: 'kbox_dump_painc_info' declared here
      21 | int kbox_dump_painc_info(const char *fmt, ...);
         |     ^
   6 warnings generated.
vim +281 drivers/net/ethernet/huawei/bma/kbox_drv/kbox_printk.c

   270	
   271	int kbox_dump_printk_info(const char *fmt, ...)
   272	{
   273		va_list args;
   274		int num = 0;
   275		char tmp_buf[TMP_BUF_SIZE] = { };
   276	
   277		if (g_printk_init_ok != KBOX_TRUE)
   278			return 0;
   279	
   280		va_start(args, fmt);
...
281		num = vsnprintf(tmp_buf, sizeof(tmp_buf) - 1, fmt, args);
   282		if (num >= 0)
   283			(void)kbox_duplicate_printk_info(tmp_buf, num);
   284	
   285		va_end(args);
   286	
   287		return num;
   288	}
   289
-- 
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https://github.com/intel/lkp-tests/wiki