[kbuild-all] Re: [PATCH v8 2/3] tty: hvc: pass DMA capable memory to put_chars()

Hi Xianting, Thank you for the patch! Perhaps something to improve: [auto build test WARNING on tty/tty-testing] [also build test WARNING on char-misc/char-misc-testing soc/for-next v5.14-rc6 next-20210818] [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/Xianting-Tian/make-hvc-pass-dma-... base: https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty.git tty-testing config: arm64-randconfig-r025-20210818 (attached as .config) compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project d2b574a4dea5b718e4386bf2e26af0126e5978ce) 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 # install arm64 cross compiling tool for clang build # apt-get install binutils-aarch64-linux-gnu # https://github.com/0day-ci/linux/commit/e1b7662dafceb07a6905b64da2f1be274... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Xianting-Tian/make-hvc-pass-dma-capable-memory-to-its-backend/20210818-162408 git checkout e1b7662dafceb07a6905b64da2f1be27498c4a46 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=arm64 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 >>): n = hp->ops->put_chars(hp->vtermno, hp->out_ch, 1); ^~~~~~~~~~ & 1 warning generated. vim +880 drivers/tty/hvc/hvc_console.c 870 871 static void hvc_poll_put_char(struct tty_driver *driver, int line, char ch) 872 { 873 struct tty_struct *tty = driver->ttys[0]; 874 struct hvc_struct *hp = tty->driver_data; 875 int n; 876 877 hp->out_ch = ch; 878 879 do { 881 } while (n <= 0); 882 } 883 #endif 884 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org