tree: https://git.kernel.org/pub/scm/linux/kernel/git/jolsa/perf.git bpf/graph head: 6d3a6d7a66654d84166f80193719450de17b8847 commit: 6b75d0dafcfbaafe55c543c044b2fcf0b91140de [2/3] x86/ftrace: Make function graph use ftrace directly config: sparc64-randconfig-r004-20210513 (attached as .config) compiler: sparc64-linux-gcc (GCC) 9.3.0 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/jolsa/perf.git/commit/?id... git remote add jolsa-perf https://git.kernel.org/pub/scm/linux/kernel/git/jolsa/perf.git git fetch --no-tags jolsa-perf bpf/graph git checkout 6b75d0dafcfbaafe55c543c044b2fcf0b91140de # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross W=1 ARCH=sparc64 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/fgraph.c:234:15: warning: no previous prototype for 'ftrace_return_to_handler' [-Wmissing-prototypes] 234 | unsigned long ftrace_return_to_handler(unsigned long frame_pointer) | ^~~~~~~~~~~~~~~~~~~~~~~~ 338 | .func = ftrace_graph_func, | ^~~~~~~~~~~~~~~~~ | ftrace_graph_ent 341 | FTRACE_OPS_GRAPH_STUB, | ^~~~~~~~~~~~~~~~~~~~~ kernel/trace/fgraph.c:337:38: note: to match this '{' 337 | static struct ftrace_ops graph_ops = { | ^ kernel/trace/fgraph.c:349:6: warning: no previous prototype for 'ftrace_graph_sleep_time_control' [-Wmissing-prototypes] 349 | void ftrace_graph_sleep_time_control(bool enable) | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ vim +338 kernel/trace/fgraph.c 336 337 static struct ftrace_ops graph_ops = { 339 .flags = FTRACE_OPS_FL_INITIALIZED | 340 FTRACE_OPS_FL_PID 342 #ifdef FTRACE_GRAPH_TRAMP_ADDR 343 .trampoline = FTRACE_GRAPH_TRAMP_ADDR, 344 /* trampoline_size is only needed for dynamically allocated tramps */ 345 #endif 346 ASSIGN_OPS_HASH(graph_ops, &global_ops.local_hash) 347 }; 348 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org