tree: https://github.com/jimc/linux.git dyn-drm-trc head: a78f403dcd7765c2691998346cffdd311310e1d0 commit: dad7758807ceb3a05385b6f9d09b58cbab8ee9ab [17/21] dyndbg: add write-events-to-tracefs code config: x86_64-rhel-8.3-func (https://download.01.org/0day-ci/archive/20220209/202202092218.3FyLGNfM-lk...) compiler: gcc-9 (Debian 9.3.0-22) 9.3.0 reproduce (this is a W=1 build): # https://github.com/jimc/linux/commit/dad7758807ceb3a05385b6f9d09b58cbab8e... git remote add jimc https://github.com/jimc/linux.git git fetch --no-tags jimc dyn-drm-trc git checkout dad7758807ceb3a05385b6f9d09b58cbab8ee9ab # save the config file to linux build tree mkdir build_dir make W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; Note: the jimc/dyn-drm-trc HEAD a78f403dcd7765c2691998346cffdd311310e1d0 builds fine. It only hurts bisectability. All errors (new ones prefixed by >>): lib/dynamic_debug.c: In function 'ddebug_trace': 754 | buf = this_cpu_ptr(ddebug_trace_bufs.bufs) + bufidx; | ^ 756 | len = vscnprintf(buf->buf, sizeof(buf->buf), fmt, args); | ^~ cc1: some warnings being treated as errors vim +754 lib/dynamic_debug.c 737 738 static void ddebug_trace(const char *fmt, va_list args) 739 { 740 struct dynamic_trace_buf *buf; 741 int bufidx; 742 int len; 743 744 preempt_disable_notrace(); 745 746 bufidx = __this_cpu_inc_return(ddebug_trace_reserve) - 1; 747 748 if (WARN_ON_ONCE(bufidx > DYNAMIC_TRACE_NESTING)) 749 goto out; 750 751 /* For the same reasons as in __ftrace_trace_stack(). */ 752 barrier(); 753 755 757 trace_console(buf->buf, len); 758 759 out: 760 /* As above. */ 761 barrier(); 762 __this_cpu_dec(ddebug_trace_reserve); 763 preempt_enable_notrace(); 764 } 765 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org