Subject: Re: [PATCH net-next v4 3/6] net: dsa: lantiq: allow arbitrary MII registers

From: kernel test robot <[email-masked]>
Date: Sun, 18 Jan 2026 04:05:22 +0800

Hi Daniel,

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/Daniel-Golle/dt-bindings-net-dsa-lantiq-gswip-use-correct-node-name/20260117-092406
base:   net-next/main
patch link:    https://lore.kernel.org/r/d5cbb8c5917197d44b62d39c9799212d1b3fe390.1768612113.git.daniel%40makrotopia.org
patch subject: [PATCH net-next v4 3/6] net: dsa: lantiq: allow arbitrary MII registers
config: sh-allmodconfig (https://download.01.org/0day-ci/archive/20260118/[email-masked]/config)
compiler: sh4-linux-gcc (GCC) 15.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260118/[email-masked]/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 <[email-masked]>
| Closes: https://lore.kernel.org/oe-kbuild-all/[email-masked]/

All errors (new ones prefixed by >>):

   In file included from drivers/net/dsa/lantiq/mxl-gsw1xx.c:23:
>> drivers/net/dsa/lantiq/mxl-gsw1xx.h:14:49: error: array index range in initializer exceeds array bounds
      14 | #define GSW1XX_MII_PORT                         5
         |                                                 ^
   drivers/net/dsa/lantiq/mxl-gsw1xx.c:708:18: note: in expansion of macro 'GSW1XX_MII_PORT'
     708 |                 [GSW1XX_MII_PORT + 1 ... GSWIP_MAX_PORTS] = -1,
         |                  ^~~~~~~~~~~~~~~
   drivers/net/dsa/lantiq/mxl-gsw1xx.h:14:49: note: (near initialization for 'gsw12x_data.mii_cfg')
      14 | #define GSW1XX_MII_PORT                         5
         |                                                 ^
   drivers/net/dsa/lantiq/mxl-gsw1xx.c:708:18: note: in expansion of macro 'GSW1XX_MII_PORT'
     708 |                 [GSW1XX_MII_PORT + 1 ... GSWIP_MAX_PORTS] = -1,
         |                  ^~~~~~~~~~~~~~~
>> drivers/net/dsa/lantiq/mxl-gsw1xx.h:14:49: error: array index range in initializer exceeds array bounds
      14 | #define GSW1XX_MII_PORT                         5
         |                                                 ^
   drivers/net/dsa/lantiq/mxl-gsw1xx.c:713:18: note: in expansion of macro 'GSW1XX_MII_PORT'
     713 |                 [GSW1XX_MII_PORT + 1 ... GSWIP_MAX_PORTS] = -1,
         |                  ^~~~~~~~~~~~~~~
   drivers/net/dsa/lantiq/mxl-gsw1xx.h:14:49: note: (near initialization for 'gsw12x_data.mii_pcdu')
      14 | #define GSW1XX_MII_PORT                         5
         |                                                 ^
   drivers/net/dsa/lantiq/mxl-gsw1xx.c:713:18: note: in expansion of macro 'GSW1XX_MII_PORT'
     713 |                 [GSW1XX_MII_PORT + 1 ... GSWIP_MAX_PORTS] = -1,
         |                  ^~~~~~~~~~~~~~~
   In file included from drivers/net/dsa/lantiq/mxl-gsw1xx.c:22:
   drivers/net/dsa/lantiq/lantiq_gswip.h:60:41: warning: initialized field overwritten [-Woverride-init]
      60 | #define GSWIP_MII_CFGp(p)               (0x2 * (p))
         |                                         ^
   drivers/net/dsa/lantiq/mxl-gsw1xx.c:749:37: note: in expansion of macro 'GSWIP_MII_CFGp'
     749 |                 [GSW1XX_MII_PORT] = GSWIP_MII_CFGp(0),
         |                                     ^~~~~~~~~~~~~~
   drivers/net/dsa/lantiq/lantiq_gswip.h:60:41: note: (near initialization for 'gsw141_data.mii_cfg[5]')
      60 | #define GSWIP_MII_CFGp(p)               (0x2 * (p))
         |                                         ^
   drivers/net/dsa/lantiq/mxl-gsw1xx.c:749:37: note: in expansion of macro 'GSWIP_MII_CFGp'
     749 |                 [GSW1XX_MII_PORT] = GSWIP_MII_CFGp(0),
         |                                     ^~~~~~~~~~~~~~
   drivers/net/dsa/lantiq/mxl-gsw1xx.c:750:65: warning: initialized field overwritten [-Woverride-init]
     750 |                 [GSW1XX_MII_PORT + 1 ... GSWIP_MAX_PORTS - 1] = -1,
         |                                                                 ^
   drivers/net/dsa/lantiq/mxl-gsw1xx.c:750:65: note: (near initialization for 'gsw141_data.mii_cfg[6]')
   drivers/net/dsa/lantiq/lantiq_gswip.h:80:41: warning: initialized field overwritten [-Woverride-init]
      80 | #define GSWIP_MII_PCDU0                 0x01
         |                                         ^~~~
   drivers/net/dsa/lantiq/mxl-gsw1xx.c:754:37: note: in expansion of macro 'GSWIP_MII_PCDU0'
     754 |                 [GSW1XX_MII_PORT] = GSWIP_MII_PCDU0,
         |                                     ^~~~~~~~~~~~~~~
   drivers/net/dsa/lantiq/lantiq_gswip.h:80:41: note: (near initialization for 'gsw141_data.mii_pcdu[5]')
      80 | #define GSWIP_MII_PCDU0                 0x01
         |                                         ^~~~
   drivers/net/dsa/lantiq/mxl-gsw1xx.c:754:37: note: in expansion of macro 'GSWIP_MII_PCDU0'
     754 |                 [GSW1XX_MII_PORT] = GSWIP_MII_PCDU0,
         |                                     ^~~~~~~~~~~~~~~
   drivers/net/dsa/lantiq/mxl-gsw1xx.c:755:65: warning: initialized field overwritten [-Woverride-init]
     755 |                 [GSW1XX_MII_PORT + 1 ... GSWIP_MAX_PORTS - 1] = -1,
         |                                                                 ^
   drivers/net/dsa/lantiq/mxl-gsw1xx.c:755:65: note: (near initialization for 'gsw141_data.mii_pcdu[6]')

vim +14 drivers/net/dsa/lantiq/mxl-gsw1xx.h

22335939ec907c Daniel Golle 2025-11-03  11  
22335939ec907c Daniel Golle 2025-11-03  12  #define GSW1XX_PORTS				6
22335939ec907c Daniel Golle 2025-11-03  13  /* Port used for RGMII or optional RMII */
22335939ec907c Daniel Golle 2025-11-03 @14  #define GSW1XX_MII_PORT				5
22335939ec907c Daniel Golle 2025-11-03  15  /* Port used for SGMII */
22335939ec907c Daniel Golle 2025-11-03  16  #define GSW1XX_SGMII_PORT			4
22335939ec907c Daniel Golle 2025-11-03  17  

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