[kbuild-all] [gustavoars:for-next/cast-function 1/3] kernel/trace/ftrace.c:7029:6: error: no previous prototype for function 'arch_ftrace_ops_list_func'

tree: https://git.kernel.org/pub/scm/linux/kernel/git/gustavoars/linux.git for-next/cast-function head: eed09ebd6f47aeb92b3fe3b8d338b2a55e534928 commit: f9d45e65ef7f67bdb39c15d09bc6021f197d893e [1/3] ftrace: Fix -Wcast-function-type warnings on powerpc64 config: i386-buildonly-randconfig-r002-20211013 (attached as .config) compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project b6a8c695542b2987eb9a203d5663a0740cb4725f) 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://git.kernel.org/pub/scm/linux/kernel/git/gustavoars/linux.git/comm... git remote add gustavoars https://git.kernel.org/pub/scm/linux/kernel/git/gustavoars/linux.git git fetch --no-tags gustavoars for-next/cast-function git checkout f9d45e65ef7f67bdb39c15d09bc6021f197d893e # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 ARCH=i386 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 >>): kernel/trace/ftrace.c:297:5: error: no previous prototype for function '__register_ftrace_function' [-Werror,-Wmissing-prototypes] int __register_ftrace_function(struct ftrace_ops *ops) ^ kernel/trace/ftrace.c:297:1: note: declare 'static' if the function is not intended to be used outside of this translation unit int __register_ftrace_function(struct ftrace_ops *ops) ^ static kernel/trace/ftrace.c:340:5: error: no previous prototype for function '__unregister_ftrace_function' [-Werror,-Wmissing-prototypes] int __unregister_ftrace_function(struct ftrace_ops *ops) ^ kernel/trace/ftrace.c:340:1: note: declare 'static' if the function is not intended to be used outside of this translation unit int __unregister_ftrace_function(struct ftrace_ops *ops) ^ static kernel/trace/ftrace.c:579:5: error: no previous prototype for function 'ftrace_profile_pages_init' [-Werror,-Wmissing-prototypes] int ftrace_profile_pages_init(struct ftrace_profile_stat *stat) ^ kernel/trace/ftrace.c:579:1: note: declare 'static' if the function is not intended to be used outside of this translation unit int ftrace_profile_pages_init(struct ftrace_profile_stat *stat) ^ static kernel/trace/ftrace.c:3871:15: error: no previous prototype for function 'arch_ftrace_match_adjust' [-Werror,-Wmissing-prototypes] char * __weak arch_ftrace_match_adjust(char *str, const char *search) ^ kernel/trace/ftrace.c:3871:1: note: declare 'static' if the function is not intended to be used outside of this translation unit char * __weak arch_ftrace_match_adjust(char *str, const char *search) ^ static void arch_ftrace_ops_list_func(unsigned long ip, unsigned long parent_ip, ^ kernel/trace/ftrace.c:7029:1: note: declare 'static' if the function is not intended to be used outside of this translation unit void arch_ftrace_ops_list_func(unsigned long ip, unsigned long parent_ip, ^ static 5 errors generated. vim +/arch_ftrace_ops_list_func +7029 kernel/trace/ftrace.c 7011 7012 /* 7013 * Some archs only support passing ip and parent_ip. Even though 7014 * the list function ignores the op parameter, we do not want any 7015 * C side effects, where a function is called without the caller 7016 * sending a third parameter. 7017 * Archs are to support both the regs and ftrace_ops at the same time. 7018 * If they support ftrace_ops, it is assumed they support regs. 7019 * If call backs want to use regs, they must either check for regs 7020 * being NULL, or CONFIG_DYNAMIC_FTRACE_WITH_REGS. 7021 * Note, CONFIG_DYNAMIC_FTRACE_WITH_REGS expects a full regs to be saved. 7022 * An architecture can pass partial regs with ftrace_ops and still 7023 * set the ARCH_SUPPORTS_FTRACE_OPS. 7024 * 7025 * In vmlinux.lds.h, ftrace_ops_list_func() is defined to be 7026 * arch_ftrace_ops_list_func. 7027 */ 7028 #if ARCH_SUPPORTS_FTRACE_OPS 7030 struct ftrace_ops *op, struct ftrace_regs *fregs) 7031 { 7032 __ftrace_ops_list_func(ip, parent_ip, NULL, fregs); 7033 } 7034 #else 7035 void arch_ftrace_ops_list_func(unsigned long ip, unsigned long parent_ip) 7036 { 7037 __ftrace_ops_list_func(ip, parent_ip, NULL, NULL); 7038 } 7039 #endif 7040 NOKPROBE_SYMBOL(arch_ftrace_ops_list_func); 7041 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org