tree: git://people.freedesktop.org/~agd5f/linux.git amd-mainline-dkms-5.4 head: fa14e19bd78eecca201da26d22c7b95ee06769c6 commit: 9e7eb67ba35568772b9f1d1d0f4978b92f712a52 [1212/2653] drm/amdkcl: [4.12] Reserve flip_flags for display usage config: c6x-allyesconfig (attached as .config) compiler: c6x-elf-gcc (GCC) 9.2.0 reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross git checkout 9e7eb67ba35568772b9f1d1d0f4978b92f712a52 # save the attached .config to linux build tree GCC_VERSION=9.2.0 make.cross ARCH=c6x If you fix the issue, kindly add following tag Reported-by: kbuild test robot <lkp(a)intel.com&gt; All error/warnings (new ones prefixed by >>): In file included from <command-line>: 5 | #if BITS_PER_LONG == 32 | ^~~~~~~~~~~~~ include/kcl/kcl_bitops.h:7:7: warning: "BITS_PER_LONG" is not defined, evaluates to 0 [-Wundef] 7 | #elif BITS_PER_LONG == 64 | ^~~~~~~~~~~~~ 10 | # error "Unexpected BITS_PER_LONG" | ^~~~~ vim +10 include/kcl/kcl_bitops.h 3 4 #ifndef _BITOPS_LONG_SHIFT 6 # define _BITOPS_LONG_SHIFT 5 7 #elif BITS_PER_LONG == 64 8 # define _BITOPS_LONG_SHIFT 6 9 #else 11 #endif 12 #endif 13 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org