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-capable-memory-to-its-backend/20210818-162408
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/e1b7662dafceb07a6905b64da2f1be27498c4a46
        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 <redacted>

All warnings (new ones prefixed by >>):

quoted

drivers/tty/hvc/hvc_console.c:880:39: warning: incompatible integer to pointer conversion passing 'char' to parameter of type 'const char *'; take the address with & [-Wint-conversion]

                   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 {
 > 880			n = hp->ops->put_chars(hp->vtermno, hp->out_ch, 1);
   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