tree: https://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace.git ftrace/fgraph-multi head: 978dc256bd4d08df876d58b4fa01ba4cb3926242 commit: af135865534e79074152c9939d2083fce5931fe1 [38/40] function_graph: Move graph notrace bit to shadow stack global var config: i386-randconfig-r035-20210416 (attached as .config) compiler: gcc-9 (Debian 9.3.0-22) 9.3.0 reproduce (this is a W=1 build): # 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 af135865534e79074152c9939d2083fce5931fe1 # save the attached .config to linux build tree make W=1 W=1 ARCH=i386 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 >>): In file included from kernel/trace/trace_output.h:6, from kernel/trace/ftrace.c:45: 856 | TRACE_GRAPH_NOTRACE_BIT, | ^~~~~~~~~~~~~~~~~~~~~~~ In file included from include/linux/ftrace.h:10, from kernel/trace/ftrace.c:29: include/linux/trace_recursion.h:65:2: note: previous definition of 'TRACE_GRAPH_NOTRACE_BIT' was here 65 | TRACE_GRAPH_NOTRACE_BIT, | ^~~~~~~~~~~~~~~~~~~~~~~ kernel/trace/ftrace.c:300:5: warning: no previous prototype for '__register_ftrace_function' [-Wmissing-prototypes] 300 | int __register_ftrace_function(struct ftrace_ops *ops) | ^~~~~~~~~~~~~~~~~~~~~~~~~~ kernel/trace/ftrace.c:343:5: warning: no previous prototype for '__unregister_ftrace_function' [-Wmissing-prototypes] 343 | int __unregister_ftrace_function(struct ftrace_ops *ops) | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~ kernel/trace/ftrace.c:3872:15: warning: no previous prototype for 'arch_ftrace_match_adjust' [-Wmissing-prototypes] 3872 | char * __weak arch_ftrace_match_adjust(char *str, const char *search) | ^~~~~~~~~~~~~~~~~~~~~~~~ -- In file included from kernel/trace/trace.c:52: 856 | TRACE_GRAPH_NOTRACE_BIT, | ^~~~~~~~~~~~~~~~~~~~~~~ In file included from include/linux/ftrace.h:10, from kernel/trace/trace.c:31: include/linux/trace_recursion.h:65:2: note: previous definition of 'TRACE_GRAPH_NOTRACE_BIT' was here 65 | TRACE_GRAPH_NOTRACE_BIT, | ^~~~~~~~~~~~~~~~~~~~~~~ kernel/trace/trace.c: In function 'trace_check_vprintf': kernel/trace/trace.c:3718:3: warning: function 'trace_check_vprintf' might be a candidate for 'gnu_printf' format attribute [-Wsuggest-attribute=format] 3718 | trace_seq_vprintf(&iter->seq, iter->fmt, ap); | ^~~~~~~~~~~~~~~~~ kernel/trace/trace.c:3757:3: warning: function 'trace_check_vprintf' might be a candidate for 'gnu_printf' format attribute [-Wsuggest-attribute=format] 3757 | trace_seq_vprintf(&iter->seq, p, ap); | ^~~~~~~~~~~~~~~~~ -- In file included from kernel/trace/trace_output.h:6, from kernel/trace/trace_output.c:14: 856 | TRACE_GRAPH_NOTRACE_BIT, | ^~~~~~~~~~~~~~~~~~~~~~~ In file included from include/linux/ftrace.h:10, from kernel/trace/trace_output.c:10: include/linux/trace_recursion.h:65:2: note: previous definition of 'TRACE_GRAPH_NOTRACE_BIT' was here 65 | TRACE_GRAPH_NOTRACE_BIT, | ^~~~~~~~~~~~~~~~~~~~~~~ kernel/trace/trace_output.c: In function 'trace_output_raw': kernel/trace/trace_output.c:331:2: warning: function 'trace_output_raw' might be a candidate for 'gnu_printf' format attribute [-Wsuggest-attribute=format] 331 | trace_seq_vprintf(s, trace_event_format(iter, fmt), ap); | ^~~~~~~~~~~~~~~~~ -- In file included from kernel/trace/trace_stat.c:18: 856 | TRACE_GRAPH_NOTRACE_BIT, | ^~~~~~~~~~~~~~~~~~~~~~~ In file included from include/linux/ftrace.h:10, from kernel/trace/trace.h:13, from kernel/trace/trace_stat.c:18: include/linux/trace_recursion.h:65:2: note: previous definition of 'TRACE_GRAPH_NOTRACE_BIT' was here 65 | TRACE_GRAPH_NOTRACE_BIT, | ^~~~~~~~~~~~~~~~~~~~~~~ -- In file included from kernel/trace/trace_functions.c:20: 856 | TRACE_GRAPH_NOTRACE_BIT, | ^~~~~~~~~~~~~~~~~~~~~~~ In file included from include/linux/ftrace.h:10, from kernel/trace/trace_functions.c:16: include/linux/trace_recursion.h:65:2: note: previous definition of 'TRACE_GRAPH_NOTRACE_BIT' was here 65 | TRACE_GRAPH_NOTRACE_BIT, | ^~~~~~~~~~~~~~~~~~~~~~~ kernel/trace/trace_functions.c: In function 'ftrace_create_function_files': kernel/trace/trace_functions.c:78:2: error: 'ret' undeclared (first use in this function); did you mean 'net'? 78 | ret = allocate_fgraph_ops(tr, tr->ops); | ^~~ | net kernel/trace/trace_functions.c:78:2: note: each undeclared identifier is reported only once for each function it appears in -- In file included from kernel/trace/trace_preemptirq.c:13: 856 | TRACE_GRAPH_NOTRACE_BIT, | ^~~~~~~~~~~~~~~~~~~~~~~ In file included from include/linux/ftrace.h:10, from kernel/trace/trace_preemptirq.c:11: include/linux/trace_recursion.h:65:2: note: previous definition of 'TRACE_GRAPH_NOTRACE_BIT' was here 65 | TRACE_GRAPH_NOTRACE_BIT, | ^~~~~~~~~~~~~~~~~~~~~~~ kernel/trace/trace_preemptirq.c:88:16: warning: no previous prototype for 'trace_hardirqs_on_caller' [-Wmissing-prototypes] 88 | __visible void trace_hardirqs_on_caller(unsigned long caller_addr) | ^~~~~~~~~~~~~~~~~~~~~~~~ kernel/trace/trace_preemptirq.c:103:16: warning: no previous prototype for 'trace_hardirqs_off_caller' [-Wmissing-prototypes] 103 | __visible void trace_hardirqs_off_caller(unsigned long caller_addr) | ^~~~~~~~~~~~~~~~~~~~~~~~~ -- In file included from kernel/trace/trace_dynevent.h:14, from kernel/trace/trace_synth.h:5, from kernel/trace/trace_events_hist.c:22: 856 | TRACE_GRAPH_NOTRACE_BIT, | ^~~~~~~~~~~~~~~~~~~~~~~ In file included from include/linux/ftrace.h:10, from include/linux/perf_event.h:49, from include/linux/trace_events.h:10, from kernel/trace/trace_events_hist.c:18: include/linux/trace_recursion.h:65:2: note: previous definition of 'TRACE_GRAPH_NOTRACE_BIT' was here 65 | TRACE_GRAPH_NOTRACE_BIT, | ^~~~~~~~~~~~~~~~~~~~~~~ kernel/trace/trace_events_hist.c: In function 'unregister_field_var_hists': kernel/trace/trace_events_hist.c:5228:6: warning: variable 'ret' set but not used [-Wunused-but-set-variable] 5228 | int ret; | ^~~ vim +/TRACE_GRAPH_NOTRACE_BIT +856 kernel/trace/trace.h 828 829 enum { 830 TRACE_GRAPH_FL = 1, 831 832 /* 833 * In the very unlikely case that an interrupt came in 834 * at a start of graph tracing, and we want to trace 835 * the function in that interrupt, the depth can be greater 836 * than zero, because of the preempted start of a previous 837 * trace. In an even more unlikely case, depth could be 2 838 * if a softirq interrupted the start of graph tracing, 839 * followed by an interrupt preempting a start of graph 840 * tracing in the softirq, and depth can even be 3 841 * if an NMI came in at the start of an interrupt function 842 * that preempted a softirq start of a function that 843 * preempted normal context!!!! Luckily, it can't be 844 * greater than 3, so the next two bits are a mask 845 * of what the depth is when we set TRACE_GRAPH_FL 846 */ 847 848 TRACE_GRAPH_DEPTH_START_BIT, 849 TRACE_GRAPH_DEPTH_END_BIT, 850 851 /* 852 * To implement set_graph_notrace, if this bit is set, we ignore 853 * function graph tracing of called functions, until the return 854 * function is called to clear it. 855 */ 857 }; 858 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org