csky-linux-ld: vdpa_sim.c:undefined reference to `mac_pton'

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   585e5b17b92dead8a3aca4e3c9876fbca5f7e0ba
commit: 0c86d774883fa17e7c81b0c8838b88d06c2c911e vdpasim: allow to assign a MAC address
date:   2 weeks ago
config: csky-randconfig-p002-20201113 (attached as .config)
compiler: csky-linux-gcc (GCC) 9.3.0
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=0c86d774883fa17e7c81b0c8838b88d06c2c911e
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout 0c86d774883fa17e7c81b0c8838b88d06c2c911e
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=csky 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@xxxxxxxxx>

All errors (new ones prefixed by >>):

   csky-linux-ld: drivers/vdpa/vdpa_sim/vdpa_sim.o: in function `vdpasim_dev_init':
   vdpa_sim.c:(.init.text+0xc8): undefined reference to `mac_pton'
>> csky-linux-ld: vdpa_sim.c:(.init.text+0x19c): undefined reference to `mac_pton'
   csky-linux-ld: drivers/android/binder.o: in function `$t':
   binder.c:(.text+0x8cd4): undefined reference to `__get_user_bad'
   csky-linux-ld: binder.c:(.text+0x8de4): undefined reference to `__get_user_bad'
   csky-linux-ld: drivers/android/binder.o: in function `$d':
   binder.c:(.text+0x8e14): undefined reference to `__get_user_bad'
   csky-linux-ld: drivers/android/binder.o: in function `$t':
   binder.c:(.text+0x938e): undefined reference to `__get_user_bad'
   csky-linux-ld: binder.c:(.text+0x93b6): undefined reference to `__get_user_bad'
   csky-linux-ld: drivers/android/binder.o:binder.c:(.text+0x9430): more undefined references to `__get_user_bad' follow

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx

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