tree: https://android.googlesource.com/kernel/goldfish android-5.4 head: 8874c961255a4a9ee3136bb98db107754164bc48 commit: df2bbf3f35122d1d879aef65254ac09ede18e6f9 [8/12] ANDROID: misc: hisi_hikey_usb: Driver to support usb functionality of Hikey960 config: arm-randconfig-r035-20200710 (attached as .config) compiler: arm-linux-gnueabi-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 git checkout df2bbf3f35122d1d879aef65254ac09ede18e6f9 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=arm If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): arm-linux-gnueabi-ld: drivers/misc/hisi_hikey_usb.o: in function `hisi_hikey_usb_remove': drivers/misc/hisi_hikey_usb.c:151: undefined reference to `usb_role_switch_unregister' arm-linux-gnueabi-ld: drivers/misc/hisi_hikey_usb.o: in function `hub_usb_role_switch_get': drivers/misc/hisi_hikey_usb.c:95: undefined reference to `usb_role_switch_get_role' arm-linux-gnueabi-ld: drivers/misc/hisi_hikey_usb.o: in function `hub_usb_role_switch_set': drivers/misc/hisi_hikey_usb.c:85: undefined reference to `usb_role_switch_set_role' arm-linux-gnueabi-ld: drivers/misc/hisi_hikey_usb.o: in function `hisi_hikey_usb_probe': drivers/misc/hisi_hikey_usb.c:124: undefined reference to `usb_role_switch_get' arm-linux-gnueabi-ld: drivers/misc/hisi_hikey_usb.c:137: undefined reference to `usb_role_switch_put' --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org