Hi Masami, I love your patch! Perhaps something to improve: [auto build test WARNING on bpf/master] url: https://github.com/intel-lab-lkp/linux/commits/Masami-Hiramatsu/kprobes-rethook-ARM-arm64-Replace-kretprobe-trampoline-with-rethook/20220405-195153 base: https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf.git master config: arm64-randconfig-r022-20220405 (https://download.01.org/0day-ci/archive/20220406/202204060512.Pzw5bnTd-lkp@xxxxxxxxx/config) compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project c4a1b07d0979e7ff20d7d541af666d822d66b566) 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 # install arm64 cross compiling tool for clang build # apt-get install binutils-aarch64-linux-gnu # https://github.com/intel-lab-lkp/linux/commit/74084aa7903f112b1c3df1f864d49b15d8aba270 git remote add linux-review https://github.com/intel-lab-lkp/linux git fetch --no-tags linux-review Masami-Hiramatsu/kprobes-rethook-ARM-arm64-Replace-kretprobe-trampoline-with-rethook/20220405-195153 git checkout 74084aa7903f112b1c3df1f864d49b15d8aba270 # save the config file to linux build tree mkdir build_dir COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=arm64 SHELL=/bin/bash arch/arm64/kernel/ If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp@xxxxxxxxx> All warnings (new ones prefixed by >>): >> arch/arm64/kernel/rethook.c:11:22: warning: no previous prototype for function 'arch_rethook_trampoline_callback' [-Wmissing-prototypes] unsigned long __used arch_rethook_trampoline_callback(struct pt_regs *regs) ^ arch/arm64/kernel/rethook.c:11:1: note: declare 'static' if the function is not intended to be used outside of this translation unit unsigned long __used arch_rethook_trampoline_callback(struct pt_regs *regs) ^ static 1 warning generated. vim +/arch_rethook_trampoline_callback +11 arch/arm64/kernel/rethook.c 9 10 /* This is called from arch_rethook_trampoline() */ > 11 unsigned long __used arch_rethook_trampoline_callback(struct pt_regs *regs) 12 { 13 return rethook_trampoline_handler(regs, regs->regs[29]); 14 } 15 NOKPROBE_SYMBOL(arch_rethook_trampoline_callback); 16 -- 0-DAY CI Kernel Test Service https://01.org/lkp
