Hi Krzysztof, FYI, the error/warning still remains. tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: f01c30de86f1047e9bae1b1b1417b0ce8dcd15b1 commit: 88eaaecc44461f9fb147bf7ee6ccc6d4e9fc23e0 usb: host: Enable compile testing for some of drivers date: 11 months ago config: sparc-randconfig-r023-20201115 (attached as .config) compiler: sparc-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... git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git git fetch --no-tags linus master git checkout 88eaaecc44461f9fb147bf7ee6ccc6d4e9fc23e0 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=sparc If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>): 1286 | #define PLATFORM_DRIVER ehci_grlib_driver | drivers/usb/host/ehci-hcd.c:1261: note: this is the location of the previous definition 1261 | #define PLATFORM_DRIVER ehci_hcd_sh_driver | In file included from drivers/usb/host/ehci-hcd.c:1260: drivers/usb/host/ehci-sh.c:173:31: warning: 'ehci_hcd_sh_driver' defined but not used [-Wunused-variable] 173 | static struct platform_driver ehci_hcd_sh_driver = { | ^~~~~~~~~~~~~~~~~~ vim +/PLATFORM_DRIVER +1286 drivers/usb/host/ehci-hcd.c 22ced6874fc47bb Anoop 2011-02-24 1283 9be039298930636 Jan Andersson 2011-05-03 1284 #ifdef CONFIG_SPARC_LEON 9be039298930636 Jan Andersson 2011-05-03 1285 #include "ehci-grlib.c" 9be039298930636 Jan Andersson 2011-05-03 @1286 #define PLATFORM_DRIVER ehci_grlib_driver 9be039298930636 Jan Andersson 2011-05-03 1287 #endif 9be039298930636 Jan Andersson 2011-05-03 1288 :::::: The code at line 1286 was first introduced by commit :::::: 9be0392989306361d4a63a06a8ee281efbead548 USB: EHCI: Add bus glue for GRLIB GRUSBHC controller :::::: TO: Jan Andersson <jan(a)gaisler.com&gt; :::::: CC: Greg Kroah-Hartman <gregkh(a)suse.de&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org