Hi Mike, I love your patch! Yet something to improve: [auto build test ERROR on next-20210408] [also build test ERROR on v5.12-rc6] [cannot apply to soc/for-next lwn/docs-next linus/master v5.12-rc6 v5.12-rc5 v5.12-rc4] [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/Mike-Leach/CoreSight-configurati... base: 6145d80cfc62e3ed8f16ff584d6287e6d88b82b9 config: arm-randconfig-s032-20210409 (attached as .config) compiler: arm-linux-gnueabi-gcc (GCC) 9.3.0 reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # apt-get install sparse # sparse version: v0.6.3-279-g6d5d9b42-dirty # https://github.com/0day-ci/linux/commit/e97fc23237355b8b816f4e4864206f91a... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Mike-Leach/CoreSight-configuration-management-ETM-strobing/20210409-183900 git checkout e97fc23237355b8b816f4e4864206f91a41652cc # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=arm 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 drivers/hwtracing/coresight/coresight-etm4x-cfg.h:10, from drivers/hwtracing/coresight/coresight-cfg-afdo.c:8: 143 | #include <asm/sysreg.h> | ^~~~~~~~~~~~~~ compilation terminated. sparse warnings: (new ones prefixed by >>) drivers/hwtracing/coresight/coresight-cfg-preload.c:20:9: sparse: sparse: Using plain integer as NULL pointer vim +143 drivers/hwtracing/coresight/coresight-etm4x.h 03336d0f4d0d74 Suzuki K Poulose 2021-02-01 142 03336d0f4d0d74 Suzuki K Poulose 2021-02-01 @143 #include <asm/sysreg.h> 03336d0f4d0d74 Suzuki K Poulose 2021-02-01 144 #define ETM4x_REG_NUM_TO_SYSREG(n) \ 03336d0f4d0d74 Suzuki K Poulose 2021-02-01 145 sys_reg(2, 1, ETM4x_CRn(n), ETM4x_CRm(n), ETM4x_Op2(n)) 03336d0f4d0d74 Suzuki K Poulose 2021-02-01 146 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org