Hi Tingwei, Thank you for the patch! Perhaps something to improve: [auto build test WARNING on next-20200819] [cannot apply to stm32/stm32-next soc/for-next linus/master v5.9-rc1 v5.8 v5.8-rc7 v5.9-rc1] [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/Tingwei-Zhang/coresight-allow-to... base: 8eb858df0a5f6bcd371b5d5637255c987278b8c9 config: arm64-allyesconfig (attached as .config) compiler: aarch64-linux-gcc (GCC) 9.3.0 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 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=arm64 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>): 356 | .probe = static_funnel_remove, | ^~~~~~~~~~~~~~~~~~~~ drivers/hwtracing/coresight/coresight-funnel.c:356:20: note: (near initialization for 'static_funnel_driver.probe') # https://github.com/0day-ci/linux/commit/2c4426928ba5d4d9b0a2767700b5ac837... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Tingwei-Zhang/coresight-allow-to-build-coresight-as-modules/20200820-135428 git checkout 2c4426928ba5d4d9b0a2767700b5ac837ecbf0c8 vim +356 drivers/hwtracing/coresight/coresight-funnel.c 353 354 static struct platform_driver static_funnel_driver = { 355 .probe = static_funnel_probe, 357 .driver = { 358 .name = "coresight-static-funnel", 359 .of_match_table = static_funnel_match, 360 .acpi_match_table = ACPI_PTR(static_funnel_ids), 361 .pm = &funnel_dev_pm_ops, 362 .suppress_bind_attrs = true, 363 }, 364 }; 365 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org