Hi Sean, I love your patch! Perhaps something to improve: [auto build test WARNING on drm-intel/for-linux-next] [also build test WARNING on drm-exynos/exynos-drm-next tegra-drm/drm/tegra/for-next drm-tip/drm-tip linus/master v5.7] [cannot apply to drm/drm-next] [if your patch is applied to the wrong git tree, please drop us a note to help improve the system. BTW, we also suggest to use '--base' option to specify the base tree in git format-patch, please see https://stackoverflow.com/a/37406982] url: https://github.com/0day-ci/linux/commits/Sean-Paul/drm-trace-Mirror-DRM-d... base: git://anongit.freedesktop.org/drm-intel for-linux-next config: riscv-allyesconfig (attached as .config) compiler: riscv64-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=riscv 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 >>, old ones prefixed by <<): drivers/gpu/drm/drm_print.c: In function 'drm_trace_init': 459 | void drm_trace_init() | ^~~~~~~~~~~~~~ drivers/gpu/drm/drm_print.c: In function 'drm_trace_cleanup': drivers/gpu/drm/drm_print.c:492:6: warning: old-style function definition [-Wold-style-definition] 492 | void drm_trace_cleanup() | ^~~~~~~~~~~~~~~~~ vim +459 drivers/gpu/drm/drm_print.c 452 453 /** 454 * drm_trace_init - initializes the drm trace array 455 * 456 * This function fetches (or creates) the drm trace array. This should be called 457 * once on drm subsystem creation and matched with drm_trace_cleanup(). 458 */ 460 { 461 trace_arr = trace_array_get_by_name("drm"); 462 if (!trace_arr) 463 return; 464 } 465 EXPORT_SYMBOL(drm_trace_init); 466 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org