tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 66f4beaa6c1d28161f534471484b2daa2de1dce0 commit: 7962c2eddbfe7cce879acb06f9b4f205789e57b7 arch: remove unused function syscall_set_arguments() date: 9 weeks ago config: ia64-defconfig (attached as .config) compiler: ia64-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://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit... git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git git fetch --no-tags linus master git checkout 7962c2eddbfe7cce879acb06f9b4f205789e57b7 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross ARCH=ia64 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 >>): arch/ia64/kernel/ptrace.c:1215:1: warning: no previous prototype for 'syscall_trace_enter' [-Wmissing-prototypes] 1215 | syscall_trace_enter (long arg0, long arg1, long arg2, long arg3, | ^~~~~~~~~~~~~~~~~~~ arch/ia64/kernel/ptrace.c:1236:1: warning: no previous prototype for 'syscall_trace_leave' [-Wmissing-prototypes] 1236 | syscall_trace_leave (long arg0, long arg1, long arg2, long arg3, | ^~~~~~~~~~~~~~~~~~~ 2053 | void syscall_get_arguments(struct task_struct *task, | ^~~~~~~~~~~~~~~~~~~~~ vim +/syscall_get_arguments +2053 arch/ia64/kernel/ptrace.c 2052 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org