Hi CGEL, Thank you for the patch! Yet something to improve: [auto build test ERROR on next-20210819] url: https://github.com/0day-ci/linux/commits/CGEL/tools-fix-warning-comparing... base: 33e65b1f975cd2814fc0ea9617250fc4c1d7a553 config: x86_64-rhel-8.3-kselftests (attached as .config) compiler: gcc-9 (Debian 9.3.0-22) 9.3.0 reproduce: # apt-get install sparse # sparse version: v0.6.3-348-gf0e6938b-dirty # https://github.com/0day-ci/linux/commit/b8c00506ae6f75c8d0dcc46b55962bb93... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review CGEL/tools-fix-warning-comparing-pointer-to-0/20210820-113325 git checkout b8c00506ae6f75c8d0dcc46b55962bb93b6bbeb5 # save the attached .config to linux build tree make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=x86_64 SHELL=/bin/bash -C tools/testing/selftests/bpf install If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): In file included from progs/profiler1.c:6: if (!kill_dat) ^~~~~~~~ kill_data progs/profiler.inc.h:362:26: note: 'kill_data' declared here struct var_kill_data_t* kill_data = bpf_map_lookup_elem(&data_heap, &zero); ^ if (!allowed_fil) ^~~~~~~~~~~ allowed_file progs/profiler.inc.h:542:8: note: 'allowed_file' declared here bool* allowed_file = bpf_map_lookup_elem(&allowed_file_inodes, &ino); ^ 2 errors generated. --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org