Messages in this thread | | | Date | Wed, 6 Oct 2021 04:26:22 +0800 | From | kernel test robot <> | Subject | kernel/trace/ftrace.c:7035:6: warning: no previous prototype for function 'arch_ftrace_ops_list_func' |
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tree: https://github.com/0day-ci/linux/commits/UPDATE-20211006-003617/Gustavo-A-R-Silva/ftrace-Fix-Wcast-function-type-warnings-on-powerpc64/20211005-133606 head: 200d9dd9fd167dae7f84464ff025b6d9bb2bc635 commit: 200d9dd9fd167dae7f84464ff025b6d9bb2bc635 ftrace: Fix -Wcast-function-type warnings on powerpc64 date: 4 hours ago config: x86_64-buildonly-randconfig-r006-20211004 (attached as .config) compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project c0039de2953d15815448b4b3c3bafb45607781e0) 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/0day-ci/linux/commit/200d9dd9fd167dae7f84464ff025b6d9bb2bc635 git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review UPDATE-20211006-003617/Gustavo-A-R-Silva/ftrace-Fix-Wcast-function-type-warnings-on-powerpc64/20211005-133606 git checkout 200d9dd9fd167dae7f84464ff025b6d9bb2bc635 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 ARCH=x86_64
If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp@intel.com>
All warnings (new ones prefixed by >>):
kernel/trace/ftrace.c:579:5: warning: no previous prototype for function 'ftrace_profile_pages_init' [-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:7035:6: warning: no previous prototype for function 'arch_ftrace_ops_list_func' [-Wmissing-prototypes] void arch_ftrace_ops_list_func(unsigned long ip, unsigned long parent_ip) ^ kernel/trace/ftrace.c:7035:1: 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 kernel/trace/ftrace.c:6931:20: warning: unused function 'ftrace_startup_enable' [-Wunused-function] static inline void ftrace_startup_enable(int command) { } ^ 3 warnings generated.
vim +/arch_ftrace_ops_list_func +7035 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 7029 void arch_ftrace_ops_list_func(unsigned long ip, unsigned long parent_ip, 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
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