Hi Yunfei, Thank you for the patch! Perhaps something to improve: [auto build test WARNING on media-tree/master] [also build test WARNING on next-20211215] [cannot apply to v5.16-rc5] [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/Yunfei-Dong/Support-multi-hardwa... base: git://linuxtv.org/media_tree.git master config: alpha-randconfig-r033-20211216 (https://download.01.org/0day-ci/archive/20211216/202112162312.CKVSGb5P-lk...) compiler: alpha-linux-gcc (GCC) 11.2.0 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 # https://github.com/0day-ci/linux/commit/7ce79e6a446bd8e992083b0fb72f09340... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Yunfei-Dong/Support-multi-hardware-decode-using-of_platform_populate/20211216-174823 git checkout 7ce79e6a446bd8e992083b0fb72f0934009ca99d # save the config file to linux build tree mkdir build_dir COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross O=build_dir ARCH=alpha SHELL=/bin/bash drivers/media/platform/mtk-vcodec/ 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 >>): In file included from include/asm-generic/bug.h:22, from arch/alpha/include/asm/bug.h:23, from include/linux/bug.h:5, from include/linux/thread_info.h:13, from include/asm-generic/current.h:5, from ./arch/alpha/include/generated/asm/current.h:1, from include/linux/sched.h:12, from include/linux/freezer.h:8, from drivers/media/platform/mtk-vcodec/vdec_msg_queue.c:7: drivers/media/platform/mtk-vcodec/vdec_msg_queue.c: In function 'vdec_msg_queue_core_work': 5 | #define KERN_SOH "\001" /* ASCII Start Of Header */ | ^~~~~~ include/linux/printk.h:422:25: note: in definition of macro 'printk_index_wrap' 422 | _p_func(_fmt, ##__VA_ARGS__); \ | ^~~~ include/linux/printk.h:132:17: note: in expansion of macro 'printk' 132 | printk(fmt, ##__VA_ARGS__); \ | ^~~~~~ include/linux/printk.h:580:9: note: in expansion of macro 'no_printk' 580 | no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__) | ^~~~~~~~~ include/linux/kern_levels.h:15:25: note: in expansion of macro 'KERN_SOH' 15 | #define KERN_DEBUG KERN_SOH "7" /* debug-level messages */ | ^~~~~~~~ include/linux/printk.h:580:19: note: in expansion of macro 'KERN_DEBUG' 580 | no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__) | ^~~~~~~~~~ drivers/media/platform/mtk-vcodec/mtk_vcodec_util.h:39:45: note: in expansion of macro 'pr_debug' 39 | #define mtk_v4l2_debug(level, fmt, args...) pr_debug(fmt, ##args) | ^~~~~~~~ drivers/media/platform/mtk-vcodec/vdec_msg_queue.c:223:17: note: in expansion of macro 'mtk_v4l2_debug' 223 | mtk_v4l2_debug(3, "re-schedule to decode for core", | ^~~~~~~~~~~~~~ vim +5 include/linux/kern_levels.h 314ba3520e513a Joe Perches 2012-07-30 4 04d2c8c83d0e3a Joe Perches 2012-07-30 @5 #define KERN_SOH "\001" /* ASCII Start Of Header */ 04d2c8c83d0e3a Joe Perches 2012-07-30 6 #define KERN_SOH_ASCII '\001' 04d2c8c83d0e3a Joe Perches 2012-07-30 7 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org