Re: [PATCH v1 net-next] tun: Ignore tun in netdev_lock_pos().

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

Hi Kuniyuki,

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/Kuniyuki-Iwashima/tun-Ignore-tun-in-netdev_lock_pos/20260328-220059
base:   net-next/main
patch link:    https://lore.kernel.org/r/20260327213441.3781433-1-kuniyu%40google.com
patch subject: [PATCH v1 net-next] tun: Ignore tun in netdev_lock_pos().
config: x86_64-rhel-9.4-kselftests (https://download.01.org/0day-ci/archive/20260329/202603291907.vWkbcfS4-lkp@intel.com/config)
compiler: gcc-14 (Debian 14.2.0-19) 14.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260329/202603291907.vWkbcfS4-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/202603291907.vWkbcfS4-lkp@intel.com/

All errors (new ones prefixed by >>):

   ld: vmlinux.o: in function `netdev_lock_pos':
>> net/core/dev.c:540:(.text+0x24fe910): undefined reference to `tun_link_ops'
>> ld: net/core/dev.c:540:(.text+0x254084c): undefined reference to `tun_link_ops'


vim +540 net/core/dev.c

   529	
   530	static inline unsigned short netdev_lock_pos(const struct net_device *dev)
   531	{
   532		unsigned short dev_type = dev->type;
   533		int i;
   534	
   535		for (i = 0; i < ARRAY_SIZE(netdev_lock_type); i++)
   536			if (netdev_lock_type[i] == dev_type)
   537				return i;
   538	
   539		/* the last key is used by default */
 > 540		WARN_ONCE(!netdev_is_tun(dev),
   541			  "netdev_lock_pos() could not find dev_type=%u\n", dev_type);
   542		return ARRAY_SIZE(netdev_lock_type) - 1;
   543	}
   544	

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