tree: https://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace.git ftrace/fgraph-multi head: 978dc256bd4d08df876d58b4fa01ba4cb3926242 commit: be13406cc12900ea57d62a9afcc33c4e11a1993f [34/40] function_graph: Have the instances use their own ftrace_ops for filtering config: parisc-randconfig-r025-20210415 (attached as .config) compiler: hppa-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/rostedt/linux-trace.git/c... git remote add trace https://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace.git git fetch --no-tags trace ftrace/fgraph-multi git checkout be13406cc12900ea57d62a9afcc33c4e11a1993f # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross W=1 ARCH=parisc 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 >>): kernel/trace/fgraph.c:481:15: warning: no previous prototype for 'ftrace_return_to_handler' [-Wmissing-prototypes] 481 | unsigned long ftrace_return_to_handler(unsigned long frame_pointer) | ^~~~~~~~~~~~~~~~~~~~~~~~ kernel/trace/fgraph.c: In function 'ftrace_return_to_handler': kernel/trace/fgraph.c:483:27: warning: variable 'ret_stack' set but not used [-Wunused-but-set-variable] 483 | struct ftrace_ret_stack *ret_stack; | ^~~~~~~~~ kernel/trace/fgraph.c: At top level: kernel/trace/fgraph.c:613:6: warning: no previous prototype for 'fgraph_init_ops' [-Wmissing-prototypes] 613 | void fgraph_init_ops(struct ftrace_ops *dst_ops, | ^~~~~~~~~~~~~~~ kernel/trace/fgraph.c:633:6: warning: no previous prototype for 'ftrace_graph_sleep_time_control' [-Wmissing-prototypes] 633 | void ftrace_graph_sleep_time_control(bool enable) | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ kernel/trace/fgraph.c:645:46: error: initialization of 'trace_func_graph_ret_t' {aka 'void (*)(struct ftrace_graph_ret *, struct fgraph_ops *)'} from incompatible pointer type 'void (*)(struct ftrace_graph_ret *)' [-Werror=incompatible-pointer-types] 645 | trace_func_graph_ret_t ftrace_graph_return = ftrace_stub_graph; | ^~~~~~~~~~~~~~~~~ kernel/trace/fgraph.c: In function 'register_ftrace_graph': 833 | int command = 0; | ^~~~~~~ kernel/trace/fgraph.c: In function 'unregister_ftrace_graph': kernel/trace/fgraph.c:924:23: error: assignment to 'trace_func_graph_ret_t' {aka 'void (*)(struct ftrace_graph_ret *, struct fgraph_ops *)'} from incompatible pointer type 'void (*)(struct ftrace_graph_ret *)' [-Werror=incompatible-pointer-types] 924 | ftrace_graph_return = ftrace_stub_graph; | ^ kernel/trace/fgraph.c:894:6: warning: variable 'command' set but not used [-Wunused-but-set-variable] 894 | int command = 0; | ^~~~~~~ cc1: some warnings being treated as errors vim +/command +833 kernel/trace/fgraph.c 830 831 int register_ftrace_graph(struct fgraph_ops *gops) 832 { 834 int ret = 0; 835 int i; 836 837 mutex_lock(&ftrace_lock); 838 839 if (!gops->ops.func) { 840 gops->ops.flags |= FTRACE_OPS_FL_STUB; 841 gops->ops.func = ftrace_stub; 842 #ifdef FTRACE_GRAPH_TRAMP_ADDR 843 gops->ops.trampoline = FTRACE_GRAPH_TRAMP_ADDR; 844 #endif 845 } 846 847 if (!fgraph_array[0]) { 848 /* The array must always have real data on it */ 849 for (i = 0; i < FGRAPH_ARRAY_SIZE; i++) { 850 fgraph_array[i] = &fgraph_stub; 851 } 852 } 853 854 /* Look for an available spot */ 855 for (i = 0; i < FGRAPH_ARRAY_SIZE; i++) { 856 if (fgraph_array[i] == &fgraph_stub) 857 break; 858 } 859 if (i >= FGRAPH_ARRAY_SIZE) { 860 ret = -EBUSY; 861 goto out; 862 } 863 864 fgraph_array[i] = gops; 865 if (i + 1 > fgraph_array_cnt) 866 fgraph_array_cnt = i + 1; 867 868 ftrace_graph_active++; 869 870 if (ftrace_graph_active == 1) { 871 register_pm_notifier(&ftrace_suspend_notifier); 872 ret = start_graph_tracing(); 873 if (ret) { 874 ftrace_graph_active--; 875 goto out; 876 } 877 /* 878 * Some archs just test to see if these are not 879 * the default function 880 */ 881 ftrace_graph_return = return_run; 882 ftrace_graph_entry = entry_run; 883 command = FTRACE_START_FUNC_RET; 884 } 885 886 ret = ftrace_startup(&gops->ops, command); 887 out: 888 mutex_unlock(&ftrace_lock); 889 return ret; 890 } 891 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org