Hi Eric, I love your patch! Yet something to improve: [auto build test ERROR on tty/tty-testing] [also build test ERROR on usb/usb-testing v5.11-rc6 next-20210125] [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/Eric-Tremblay/Handle-UART-without-interrupt-on-TEMT-using-em485/20210205-002255 base: https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty.git tty-testing config: ia64-randconfig-r032-20210204 (attached as .config) compiler: ia64-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://github.com/0day-ci/linux/commit/070c956e2d260c56b13f43b7d092b4a20664248c git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Eric-Tremblay/Handle-UART-without-interrupt-on-TEMT-using-em485/20210205-002255 git checkout 070c956e2d260c56b13f43b7d092b4a20664248c # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=ia64 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp@xxxxxxxxx> All errors (new ones prefixed by >>, old ones prefixed by <<): >> ERROR: modpost: "uart_get_byte_size" [drivers/tty/serial/8250/8250_base.ko] undefined! Kconfig warnings: (for reference only) WARNING: unmet direct dependencies detected for FRAME_POINTER Depends on DEBUG_KERNEL && (M68K || UML || SUPERH) || ARCH_WANT_FRAME_POINTERS Selected by - FAULT_INJECTION_STACKTRACE_FILTER && FAULT_INJECTION_DEBUG_FS && STACKTRACE_SUPPORT && !X86_64 && !MIPS && !PPC && !S390 && !MICROBLAZE && !ARM && !ARC && !X86 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx
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