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 tegra-drm/drm/tegra/for-next drm-tip/drm-tip linus/master drm-exynos/exynos-drm-next v5.9-rc1 next-20200818] [cannot apply to drm/drm-next] [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/Sean-Paul/drm-trace-Mirror-DRM-d... base: git://anongit.freedesktop.org/drm-intel for-linux-next config: openrisc-randconfig-s031-20200818 (attached as .config) compiler: or1k-linux-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: v0.6.2-183-gaa6ede3b-dirty # 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=openrisc If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; sparse warnings: (new ones prefixed by >>) drivers/gpu/drm/drm_print.c:467:15: sparse: sparse: undefined identifier 'trace_array_init_printk' drivers/gpu/drm/drm_print.c: note: in included file (through arch/openrisc/include/asm/io.h, include/linux/io.h): include/asm-generic/io.h:179:15: sparse: sparse: cast to restricted __le32 include/asm-generic/io.h:179:15: sparse: sparse: cast to restricted __le32 include/asm-generic/io.h:179:15: sparse: sparse: cast to restricted __le32 include/asm-generic/io.h:179:15: sparse: sparse: cast to restricted __le32 include/asm-generic/io.h:179:15: sparse: sparse: cast to restricted __le32 include/asm-generic/io.h:179:15: sparse: sparse: cast to restricted __le32 # https://github.com/0day-ci/linux/commit/fe0a955028a2121ce9ab9acd1c2ab74d2... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Sean-Paul/drm-trace-Mirror-DRM-debug-logs-to-tracefs/20200819-050745 git checkout fe0a955028a2121ce9ab9acd1c2ab74d219cdc60 vim +/drm_trace_init +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 int ret; 462 463 trace_arr = trace_array_get_by_name("drm"); 464 if (!trace_arr) 465 return; 466 467 ret = trace_array_init_printk(trace_arr); 468 if (ret) 469 drm_trace_cleanup(); 470 } 471 EXPORT_SYMBOL(drm_trace_init); 472 473 /** 474 * drm_trace_printf - adds an entry to the drm tracefs instance 475 * @format: printf format of the message to add to the trace 476 * 477 * This function adds a new entry in the drm tracefs instance 478 */ 479 void drm_trace_printf(const char *format, ...) 480 { 481 struct va_format vaf; 482 va_list args; 483 484 va_start(args, format); 485 vaf.fmt = format; 486 vaf.va = &args; 487 trace_array_printk(trace_arr, _THIS_IP_, "%pV", &vaf); 488 va_end(args); 489 } 490 491 /** 492 * drm_trace_cleanup - destroys the drm trace array 493 * 494 * This function destroys the drm trace array created with drm_trace_init. This 495 * should be called once on drm subsystem close and matched with 496 * drm_trace_init(). 497 */ --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org