Re: [PATCH net-next v4 2/2] net: dsa: yt921x: Use u64_stats_t for MIB stats

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

Hi David,

kernel test robot noticed the following build errors:

[auto build test ERROR on net-next/main]

url:    https://github.com/intel-lab-lkp/linux/commits/David-Yang/net-dsa-yt921x-Return-early-for-failed-MIB-read/20260307-004743
base:   net-next/main
patch link:    https://lore.kernel.org/r/20260306154637.3126497-3-mmyangfl%40gmail.com
patch subject: [PATCH net-next v4 2/2] net: dsa: yt921x: Use u64_stats_t for MIB stats
config: i386-buildonly-randconfig-003-20260307 (https://download.01.org/0day-ci/archive/20260308/202603080637.k8pQfAUS-lkp@intel.com/config)
compiler: gcc-12 (Debian 12.4.0-5) 12.4.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260308/202603080637.k8pQfAUS-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/202603080637.k8pQfAUS-lkp@intel.com/

All errors (new ones prefixed by >>):

   In file included from drivers/net/dsa/yt921x.c:29:
>> drivers/net/dsa/yt921x.h:588:29: error: flexible array member in union
     588 |                 u64_stats_t stats[];
         |                             ^~~~~


vim +588 drivers/net/dsa/yt921x.h

   533	
   534	struct yt921x_mib {
   535		union {
   536			struct {
   537				u64_stats_t rx_broadcast;
   538				u64_stats_t rx_pause;
   539				u64_stats_t rx_multicast;
   540				u64_stats_t rx_crc_errors;
   541	
   542				u64_stats_t rx_alignment_errors;
   543				u64_stats_t rx_undersize_errors;
   544				u64_stats_t rx_fragment_errors;
   545				u64_stats_t rx_64byte;
   546	
   547				u64_stats_t rx_65_127byte;
   548				u64_stats_t rx_128_255byte;
   549				u64_stats_t rx_256_511byte;
   550				u64_stats_t rx_512_1023byte;
   551	
   552				u64_stats_t rx_1024_1518byte;
   553				u64_stats_t rx_jumbo;
   554				u64_stats_t rx_good_bytes;
   555	
   556				u64_stats_t rx_bad_bytes;
   557				u64_stats_t rx_oversize_errors;
   558	
   559				u64_stats_t rx_dropped;
   560				u64_stats_t tx_broadcast;
   561				u64_stats_t tx_pause;
   562				u64_stats_t tx_multicast;
   563	
   564				u64_stats_t tx_undersize_errors;
   565				u64_stats_t tx_64byte;
   566				u64_stats_t tx_65_127byte;
   567				u64_stats_t tx_128_255byte;
   568	
   569				u64_stats_t tx_256_511byte;
   570				u64_stats_t tx_512_1023byte;
   571				u64_stats_t tx_1024_1518byte;
   572				u64_stats_t tx_jumbo;
   573	
   574				u64_stats_t tx_good_bytes;
   575				u64_stats_t tx_collisions;
   576	
   577				u64_stats_t tx_aborted_errors;
   578				u64_stats_t tx_multiple_collisions;
   579				u64_stats_t tx_single_collisions;
   580				u64_stats_t tx_good;
   581	
   582				u64_stats_t tx_deferred;
   583				u64_stats_t tx_late_collisions;
   584				u64_stats_t rx_oam;
   585				u64_stats_t tx_oam;
   586			};
   587	
 > 588			u64_stats_t stats[];
   589		};
   590	};
   591	

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