Hi Menglong, kernel test robot noticed the following build warnings: [auto build test WARNING on bpf-next/master] url: https://github.com/intel-lab-lkp/linux/commits/Menglong-Dong/add-per-function-metadata-storage-support/20250528-115819 base: https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git master patch link: https://lore.kernel.org/r/20250528034712.138701-16-dongml2%40chinatelecom.cn patch subject: [PATCH bpf-next 15/25] ftrace: factor out __unregister_ftrace_direct config: sparc-randconfig-001-20250528 (https://download.01.org/0day-ci/archive/20250528/202505282037.xt8RiXkG-lkp@xxxxxxxxx/config) compiler: sparc64-linux-gcc (GCC) 14.3.0 reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250528/202505282037.xt8RiXkG-lkp@xxxxxxxxx/reproduce) If you fix the issue in a separate patch/commit (i.e. not just a new version of the same patch/commit), kindly add following tags | Reported-by: kernel test robot <lkp@xxxxxxxxx> | Closes: https://lore.kernel.org/oe-kbuild-all/202505282037.xt8RiXkG-lkp@xxxxxxxxx/ All warnings (new ones prefixed by >>): >> kernel/trace/ftrace.c:116:12: warning: '__unregister_ftrace_direct' declared 'static' but never defined [-Wunused-function] 116 | static int __unregister_ftrace_direct(struct ftrace_ops *ops, unsigned long addr, | ^~~~~~~~~~~~~~~~~~~~~~~~~~ -- >> kernel/trace/ftrace.c:6053: warning: expecting prototype for unregister_ftrace_direct(). Prototype was for __unregister_ftrace_direct() instead vim +116 kernel/trace/ftrace.c 114 115 static void ftrace_update_trampoline(struct ftrace_ops *ops); > 116 static int __unregister_ftrace_direct(struct ftrace_ops *ops, unsigned long addr, 117 bool free_filters); 118 -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki
