Hi Hammer, I love your patch! Yet something to improve: [auto build test ERROR on linux/master] [cannot apply to tty/tty-testing robh/for-next linus/master v5.17-rc4 next-20220215] [If your patch is applied to the wrong git tree, kindly drop us a note. And when submitting patch, we suggest to use '--base' as documented in https://git-scm.com/docs/git-format-patch] url: https://github.com/0day-ci/linux/commits/Hammer-Hsieh/Add-UART-driver-for... base: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 2c271fe77d52a0555161926c232cd5bc07178b39 config: sh-allmodconfig (https://download.01.org/0day-ci/archive/20220215/202202152052.4RCALWQy-lk...) compiler: sh4-linux-gcc (GCC) 11.2.0 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://github.com/0day-ci/linux/commit/acb196db041b9bf489d6378ffb6375107... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Hammer-Hsieh/Add-UART-driver-for-Suplus-SP7021-SoC/20220215-172535 git checkout acb196db041b9bf489d6378ffb63751070deea90 # save the config file to linux build tree mkdir build_dir COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross O=build_dir ARCH=sh SHELL=/bin/bash drivers/tty/ 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 >>): In file included from drivers/tty/serial/sunplus-uart.c:25: 131 | static inline initcall_t __maybe_unused __inittest(void) \ | ^~~~~~~~~~ drivers/tty/serial/sunplus-uart.c:731:1: note: in expansion of macro 'module_init' 731 | module_init(sunplus_uart_init); | ^~~~~~~~~~~ include/linux/module.h:131:49: note: previous definition of '__inittest' with type 'int (*(void))(void)' 131 | static inline initcall_t __maybe_unused __inittest(void) \ | ^~~~~~~~~~ include/linux/module.h:127:41: note: in expansion of macro 'module_init' 127 | #define console_initcall(fn) module_init(fn) | ^~~~~~~~~~~ drivers/tty/serial/sunplus-uart.c:566:1: note: in expansion of macro 'console_initcall' 566 | console_initcall(sunplus_console_init); | ^~~~~~~~~~~~~~~~ 133 | int init_module(void) __copy(initfn) \ | ^~~~~~~~~~~ drivers/tty/serial/sunplus-uart.c:731:1: note: in expansion of macro 'module_init' 731 | module_init(sunplus_uart_init); | ^~~~~~~~~~~ include/linux/module.h:133:13: note: previous definition of 'init_module' with type 'int(void)' 133 | int init_module(void) __copy(initfn) \ | ^~~~~~~~~~~ include/linux/module.h:127:41: note: in expansion of macro 'module_init' 127 | #define console_initcall(fn) module_init(fn) | ^~~~~~~~~~~ drivers/tty/serial/sunplus-uart.c:566:1: note: in expansion of macro 'console_initcall' 566 | console_initcall(sunplus_console_init); | ^~~~~~~~~~~~~~~~ vim +/__inittest +131 include/linux/module.h 0fd972a7d91d6e Paul Gortmaker 2015-05-01 128 0fd972a7d91d6e Paul Gortmaker 2015-05-01 129 /* Each module must use one module_init(). */ 0fd972a7d91d6e Paul Gortmaker 2015-05-01 130 #define module_init(initfn) \ 1f318a8bafcfba Arnd Bergmann 2017-02-01 @131 static inline initcall_t __maybe_unused __inittest(void) \ 0fd972a7d91d6e Paul Gortmaker 2015-05-01 132 { return initfn; } \ cf68fffb66d60d Sami Tolvanen 2021-04-08 @133 int init_module(void) __copy(initfn) \ cf68fffb66d60d Sami Tolvanen 2021-04-08 134 __attribute__((alias(#initfn))); \ cf68fffb66d60d Sami Tolvanen 2021-04-08 135 __CFI_ADDRESSABLE(init_module, __initdata); 0fd972a7d91d6e Paul Gortmaker 2015-05-01 136 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org