[djiang:cxl/fwctl 13/25] drivers/cxl/cxlmem.h:798:44: error: 'counted_by' argument must be a simple declaration reference

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

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/djiang/linux.git cxl/fwctl
head:   b4f2900f53c72de8fc639b62e44763c6a9695d3b
commit: 5a0496c19151d83cd0d926f8a1488eeaab27509b [13/25] cxl: Add Get Supported Features command for kernel usage
config: arm-randconfig-004-20240927 (https://download.01.org/0day-ci/archive/20240927/202409270908.NJPL38kw-lkp@intel.com/config)
compiler: clang version 20.0.0git (https://github.com/llvm/llvm-project 7773243d9916f98ba0ffce0c3a960e4aa9f03e81)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240927/202409270908.NJPL38kw-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/202409270908.NJPL38kw-lkp@intel.com/

All errors (new ones prefixed by >>):

   In file included from drivers/cxl/port.c:7:
   In file included from drivers/cxl/cxlmem.h:6:
   In file included from include/linux/pci.h:1646:
   In file included from include/linux/dmapool.h:14:
   In file included from include/linux/scatterlist.h:8:
   In file included from include/linux/mm.h:2232:
   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_"
         |                               ~~~~~~~~~~~ ^ ~~~
   In file included from drivers/cxl/port.c:7:
>> drivers/cxl/cxlmem.h:798:44: error: 'counted_by' argument must be a simple declaration reference
     798 |         struct cxl_feat_entry ents[] __counted_by(le32_to_cpu(supported_feats));
         |                                      ~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/byteorder/generic.h:89:21: note: expanded from macro 'le32_to_cpu'
      89 | #define le32_to_cpu __le32_to_cpu
         |                     ^
   include/uapi/linux/byteorder/little_endian.h:35:26: note: expanded from macro '__le32_to_cpu'
      35 | #define __le32_to_cpu(x) ((__force __u32)(__le32)(x))
         |                          ^
   include/linux/compiler_attributes.h:105:62: note: expanded from macro '__counted_by'
     105 | # define __counted_by(member)           __attribute__((__counted_by__(member)))
         |                                                                       ^~~~~~
   1 warning and 1 error generated.


vim +/counted_by +798 drivers/cxl/cxlmem.h

   793	
   794	struct cxl_mbox_get_sup_feats_out {
   795		__le16 num_entries;
   796		__le16 supported_feats;
   797		u8 reserved[4];
 > 798		struct cxl_feat_entry ents[] __counted_by(le32_to_cpu(supported_feats));
   799	} __packed;
   800	

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