tree: https://github.com/jimc/linux.git dyn-drm-trc head: df426d10840ccdda8ef29b66f8df55a010836a7c commit: 55bd43faa7bd6fe653d8b401414961a35bcd9151 [16/19] dyndbg: add write-events-to-tracefs code config: arc-randconfig-r015-20220213 (https://download.01.org/0day-ci/archive/20220213/202202132037.RtzRjiQe-lk...) compiler: arc-elf-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/jimc/linux/commit/55bd43faa7bd6fe653d8b401414961a35bcd... git remote add jimc https://github.com/jimc/linux.git git fetch --no-tags jimc dyn-drm-trc git checkout 55bd43faa7bd6fe653d8b401414961a35bcd9151 # 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=arc SHELL=/bin/bash 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 >>): lib/dynamic_debug.c: In function 'ddebug_trace': 754 | len = vscnprintf(buf->buf, sizeof(buf->buf), fmt, args); | ^~~ cc1: all warnings being treated as errors vim +754 lib/dynamic_debug.c 735 736 static void ddebug_trace(const char *fmt, va_list args) 737 { 738 struct ddebug_trace_buf *buf; 739 int bufidx; 740 int len; 741 742 preempt_disable_notrace(); 743 744 bufidx = __this_cpu_inc_return(ddebug_trace_reserve) - 1; 745 746 if (WARN_ON_ONCE(bufidx > DYNAMIC_TRACE_NESTING)) 747 goto out; 748 749 /* For the same reasons as in __ftrace_trace_stack(). */ 750 barrier(); 751 752 buf = this_cpu_ptr(ddebug_trace_bufs.bufs) + bufidx; 753 755 trace_console(buf->buf, len); 756 757 out: 758 /* As above. */ 759 barrier(); 760 __this_cpu_dec(ddebug_trace_reserve); 761 preempt_enable_notrace(); 762 } 763 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org