[kbuild-all] [jimc:dyn-drm-trc 4/20] lib/dynamic_debug.c:698:17: warning: function 'ddebug_printk' might be a candidate for 'gnu_printf' format attribute

tree: https://github.com/jimc/linux.git dyn-drm-trc head: 21798489725b7deafd2bd79afa477a68a4840dda commit: f5b0d82213a36476415ce55e223acd3ee8e7fcf8 [4/20] dyndbg: s/dynamic_/ddebug_/ config: riscv-randconfig-r042-20220123 (https://download.01.org/0day-ci/archive/20220124/202201241735.ZhHKTlca-lk...) compiler: riscv32-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/f5b0d82213a36476415ce55e223acd3ee8e7... git remote add jimc https://github.com/jimc/linux.git git fetch --no-tags jimc dyn-drm-trc git checkout f5b0d82213a36476415ce55e223acd3ee8e7fcf8 # 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=riscv 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 warnings (new ones prefixed by >>): lib/dynamic_debug.c:646:34: error: array type has incomplete element type 'struct dynamic_trace_buf' 646 | struct dynamic_trace_buf bufs[DYNAMIC_TRACE_NESTING]; | ^~~~ lib/dynamic_debug.c: In function 'ddebug_trace': lib/dynamic_debug.c:670:29: error: invalid use of undefined type 'struct dynamic_trace_buf' 670 | len = vscnprintf(buf->buf, sizeof(buf->buf), fmt, args); | ^~ lib/dynamic_debug.c:670:46: error: invalid use of undefined type 'struct dynamic_trace_buf' 670 | len = vscnprintf(buf->buf, sizeof(buf->buf), fmt, args); | ^~ lib/dynamic_debug.c:671:26: error: invalid use of undefined type 'struct dynamic_trace_buf' 671 | trace_console(buf->buf, len); | ^~ lib/dynamic_debug.c: In function 'ddebug_printk': 698 | vprintk(fmt, args); | ^~~~~~~ lib/dynamic_debug.c: In function 'ddebug_dev_printk': 719 | dev_vprintk_emit(LOGLEVEL_DEBUG, dev, fmt, args); | ^~~~~~~~~~~~~~~~ vim +698 lib/dynamic_debug.c e60a9cdd5978eb Jim Cromie 2021-11-22 679 f5b0d82213a364 Jim Cromie 2022-01-21 680 static void ddebug_printk(unsigned int flags, const char *fmt, ...) e60a9cdd5978eb Jim Cromie 2021-11-22 681 { e60a9cdd5978eb Jim Cromie 2021-11-22 682 if (flags & _DPRINTK_FLAGS_TRACE) { e60a9cdd5978eb Jim Cromie 2021-11-22 683 va_list args; e60a9cdd5978eb Jim Cromie 2021-11-22 684 e60a9cdd5978eb Jim Cromie 2021-11-22 685 va_start(args, fmt); e60a9cdd5978eb Jim Cromie 2021-11-22 686 /* e60a9cdd5978eb Jim Cromie 2021-11-22 687 * All callers include the KERN_DEBUG prefix to keep the e60a9cdd5978eb Jim Cromie 2021-11-22 688 * vprintk case simple; strip it out for tracing. e60a9cdd5978eb Jim Cromie 2021-11-22 689 */ f5b0d82213a364 Jim Cromie 2022-01-21 690 ddebug_trace(fmt + strlen(KERN_DEBUG), args); e60a9cdd5978eb Jim Cromie 2021-11-22 691 va_end(args); e60a9cdd5978eb Jim Cromie 2021-11-22 692 } e60a9cdd5978eb Jim Cromie 2021-11-22 693 e60a9cdd5978eb Jim Cromie 2021-11-22 694 if (flags & _DPRINTK_FLAGS_PRINTK) { e60a9cdd5978eb Jim Cromie 2021-11-22 695 va_list args; e60a9cdd5978eb Jim Cromie 2021-11-22 696 e60a9cdd5978eb Jim Cromie 2021-11-22 697 va_start(args, fmt); e60a9cdd5978eb Jim Cromie 2021-11-22 @698 vprintk(fmt, args); e60a9cdd5978eb Jim Cromie 2021-11-22 699 va_end(args); e60a9cdd5978eb Jim Cromie 2021-11-22 700 } e60a9cdd5978eb Jim Cromie 2021-11-22 701 } e60a9cdd5978eb Jim Cromie 2021-11-22 702 f5b0d82213a364 Jim Cromie 2022-01-21 703 static void ddebug_dev_printk(unsigned int flags, const struct device *dev, e60a9cdd5978eb Jim Cromie 2021-11-22 704 const char *fmt, ...) e60a9cdd5978eb Jim Cromie 2021-11-22 705 { e60a9cdd5978eb Jim Cromie 2021-11-22 706 e60a9cdd5978eb Jim Cromie 2021-11-22 707 if (flags & _DPRINTK_FLAGS_TRACE) { e60a9cdd5978eb Jim Cromie 2021-11-22 708 va_list args; e60a9cdd5978eb Jim Cromie 2021-11-22 709 e60a9cdd5978eb Jim Cromie 2021-11-22 710 va_start(args, fmt); f5b0d82213a364 Jim Cromie 2022-01-21 711 ddebug_trace(fmt, args); e60a9cdd5978eb Jim Cromie 2021-11-22 712 va_end(args); e60a9cdd5978eb Jim Cromie 2021-11-22 713 } e60a9cdd5978eb Jim Cromie 2021-11-22 714 e60a9cdd5978eb Jim Cromie 2021-11-22 715 if (flags & _DPRINTK_FLAGS_PRINTK) { e60a9cdd5978eb Jim Cromie 2021-11-22 716 va_list args; e60a9cdd5978eb Jim Cromie 2021-11-22 717 e60a9cdd5978eb Jim Cromie 2021-11-22 718 va_start(args, fmt); e60a9cdd5978eb Jim Cromie 2021-11-22 @719 dev_vprintk_emit(LOGLEVEL_DEBUG, dev, fmt, args); e60a9cdd5978eb Jim Cromie 2021-11-22 720 va_end(args); e60a9cdd5978eb Jim Cromie 2021-11-22 721 } e60a9cdd5978eb Jim Cromie 2021-11-22 722 } e60a9cdd5978eb Jim Cromie 2021-11-22 723 :::::: The code at line 698 was first introduced by commit :::::: e60a9cdd5978ebaf8e65db1111ea2459359ea5e5 dyndbg: add write-to-tracefs code :::::: TO: Jim Cromie <jim.cromie(a)gmail.com&gt; :::::: CC: Jim Cromie <jim.cromie(a)gmail.com&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org