tree: https://github.com/jimc/linux.git vincent head: 019640b342b50f20562c48772b7a9383eee5f85e commit: 94cdbcf9aa003a6bf6cb4d302d391693422f9903 [3/5] vincents dd.c code config: mips-randconfig-r034-20211122 (https://download.01.org/0day-ci/archive/20211123/202111232328.GQdLmFxd-lk...) compiler: mipsel-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/jimc/linux/commit/94cdbcf9aa003a6bf6cb4d302d391693422f... git remote add jimc https://github.com/jimc/linux.git git fetch --no-tags jimc vincent git checkout 94cdbcf9aa003a6bf6cb4d302d391693422f9903 # save the config file to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross ARCH=mips 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 >>): lib/dynamic_debug.c:95:11: error: '_DPRINTK_FLAGS_TRACE' undeclared here (not in a function) 95 | { _DPRINTK_FLAGS_TRACE, 'x' }, | ^~~~~~~~~~~~~~~~~~~~ lib/dynamic_debug.c: In function 'dynamic_trace': 669 | len = vscnprintf(buf->buf, sizeof(buf->buf), fmt, args); | ^~~ lib/dynamic_debug.c: In function 'dynamic_printk': 697 | vprintk(fmt, args); | ^~~~~~~ lib/dynamic_debug.c: In function 'dynamic_dev_printk': 718 | dev_vprintk_emit(LOGLEVEL_DEBUG, dev, fmt, args); | ^~~~~~~~~~~~~~~~ vim +669 lib/dynamic_debug.c 650 651 static void dynamic_trace(const char *fmt, va_list args) 652 { 653 struct dynamic_trace_buf *buf; 654 int bufidx; 655 int len; 656 657 preempt_disable_notrace(); 658 659 bufidx = __this_cpu_inc_return(dynamic_trace_reserve) - 1; 660 661 if (WARN_ON_ONCE(bufidx > DYNAMIC_TRACE_NESTING)) 662 goto out; 663 664 /* For the same reasons as in __ftrace_trace_stack(). */ 665 barrier(); 666 667 buf = this_cpu_ptr(dynamic_trace_bufs.bufs) + bufidx; 668 670 trace_dyndbg(buf->buf, len); 671 672 out: 673 /* As above. */ 674 barrier(); 675 __this_cpu_dec(dynamic_trace_reserve); 676 preempt_enable_notrace(); 677 } 678 679 static void dynamic_printk(unsigned int flags, const char *fmt, ...) 680 { 681 if (flags & _DPRINTK_FLAGS_TRACE) { 682 va_list args; 683 684 va_start(args, fmt); 685 /* 686 * All callers include the KERN_DEBUG prefix to keep the 687 * vprintk case simple; strip it out for tracing. 688 */ 689 dynamic_trace(fmt + strlen(KERN_DEBUG), args); 690 va_end(args); 691 } 692 693 if (flags & _DPRINTK_FLAGS_PRINTK) { 694 va_list args; 695 696 va_start(args, fmt); 698 va_end(args); 699 } 700 } 701 702 static void dynamic_dev_printk(unsigned int flags, const struct device *dev, 703 const char *fmt, ...) 704 { 705 706 if (flags & _DPRINTK_FLAGS_TRACE) { 707 va_list args; 708 709 va_start(args, fmt); 710 dynamic_trace(fmt, args); 711 va_end(args); 712 } 713 714 if (flags & _DPRINTK_FLAGS_PRINTK) { 715 va_list args; 716 717 va_start(args, fmt); 719 va_end(args); 720 } 721 } 722 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org