Hi Andy,

I love your patch! Perhaps something to improve:

[auto build test WARNING on linux/master]
[also build test WARNING on linus/master v5.12 next-20210504]
[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/Andy-Shevchenko/lib-string_helpers-get-rid-of-ugly-_escape_mem_ascii/20210504-182828
base:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 1fe5501ba1abf2b7e78295df73675423bd6899a0
config: s390-randconfig-r033-20210504 (attached as .config)
compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project 8f5a2a5836cc8e4c1def2bdeb022e7b496623439)
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 s390 cross compiling tool for clang build
        # apt-get install binutils-s390x-linux-gnu
        # https://github.com/0day-ci/linux/commit/047508aa8c09cb58cf304e9025283021731b3921
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Andy-Shevchenko/lib-string_helpers-get-rid-of-ugly-_escape_mem_ascii/20210504-182828
        git checkout 047508aa8c09cb58cf304e9025283021731b3921
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 ARCH=s390 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All warnings (new ones prefixed by >>):

>> drivers/tty/vt/selection.c:36:9: warning: 'isspace' macro redefined [-Wmacro-redefined]
   #define isspace(c)      ((c) == ' ')
           ^
   include/linux/ctype.h:33:9: note: previous definition is here
   #define isspace(c)      ((__ismask(c)&(_S)) != 0)
           ^
   1 warning generated.


vim +/isspace +36 drivers/tty/vt/selection.c

687bff0cd08f79 drivers/tty/vt/selection.c Jiri Slaby     2020-02-10  34  
^1da177e4c3f41 drivers/char/selection.c   Linus Torvalds 2005-04-16  35  /* Don't take this from <ctype.h>: 011-015 on the screen aren't spaces */
^1da177e4c3f41 drivers/char/selection.c   Linus Torvalds 2005-04-16 @36  #define isspace(c)	((c) == ' ')
^1da177e4c3f41 drivers/char/selection.c   Linus Torvalds 2005-04-16  37  

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org