Hi Gwan-gyeong,

I love your patch! Perhaps something to improve:

[auto build test WARNING on drm-tip/drm-tip]
[also build test WARNING on linus/master v6.0-rc7]
[cannot apply to drm-intel/for-linux-next kees/for-next/hardening next-20220928]
[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#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Gwan-gyeong-Mun/Fixes-integer-overflow-or-integer-truncation-issues-in-page-lookups-ttm-place-configuration-and-scatterlist-creation/20220927-094859
base:   git://anongit.freedesktop.org/drm/drm-tip drm-tip
config: riscv-randconfig-r042-20220925
compiler: riscv64-linux-gcc (GCC) 12.1.0
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/intel-lab-lkp/linux/commit/49eb3d58d93b3ac457ea8de8879e19e55c2788e6
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Gwan-gyeong-Mun/Fixes-integer-overflow-or-integer-truncation-issues-in-page-lookups-ttm-place-configuration-and-scatterlist-creation/20220927-094859
        git checkout 49eb3d58d93b3ac457ea8de8879e19e55c2788e6
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=riscv SHELL=/bin/bash lib/

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

All warnings (new ones prefixed by >>):

>> lib/overflow_kunit.c:20: warning: ignoring '#pragma clang diagnostic' [-Wunknown-pragmas]
      20 | #pragma clang diagnostic ignored "-Wtautological-constant-out-of-range-compare"
         | 
   lib/overflow_kunit.c: In function 'castable_to_type_test':
   lib/overflow_kunit.c:984:13: warning: unused variable 'small' [-Wunused-variable]
     984 |         s64 small;
         |             ^~~~~
   lib/overflow_kunit.c:983:13: warning: unused variable 'big' [-Wunused-variable]
     983 |         u64 big;
         |             ^~~


vim +20 lib/overflow_kunit.c

    18	
    19	/* We're expecting to do a lot of "always true" or "always false" tests. */
  > 20	#pragma clang diagnostic ignored "-Wtautological-constant-out-of-range-compare"
    21	

-- 
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https://01.org/lkp