tree: https://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace.git ftrace-regs head: 88610b6f216a17265a798caaefa557a8a73338f7 commit: a1fed3f30010663200313fd4d0f36e202a222917 [25/26] ftrace/x86: Allow for arguments to be passed in to ftrace_regs by default config: x86_64-randconfig-a013-20201111 (attached as .config) compiler: gcc-9 (Debian 9.3.0-15) 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-regs git checkout a1fed3f30010663200313fd4d0f36e202a222917 # save the attached .config to linux build tree make W=1 ARCH=x86_64 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_irqsoff.c:16: include/linux/ftrace.h:102:63: warning: 'struct ftrace_regs' declared inside parameter list will not be visible outside of this definition or declaration 102 | static __always_inline struct pt_regs *ftrace_get_regs(struct ftrace_regs *fregs) | ^~~~~~~~~~~ include/linux/ftrace.h: In function 'ftrace_get_regs': include/linux/ftrace.h:107:9: error: implicit declaration of function 'arch_ftrace_get_regs'; did you mean 'ftrace_get_regs'? [-Werror=implicit-function-declaration] 107 | return arch_ftrace_get_regs(fregs); | ^~~~~~~~~~~~~~~~~~~~ | ftrace_get_regs include/linux/ftrace.h:107:9: warning: returning 'int' from a function with return type 'struct pt_regs *' makes pointer from integer without a cast [-Wint-conversion] 107 | return arch_ftrace_get_regs(fregs); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~ include/linux/ftrace.h: At top level: include/linux/ftrace.h:111:40: warning: 'struct ftrace_regs' declared inside parameter list will not be visible outside of this definition or declaration 111 | struct ftrace_ops *op, struct ftrace_regs *fregs); | ^~~~~~~~~~~ include/linux/ftrace.h:279:34: warning: 'struct ftrace_regs' declared inside parameter list will not be visible outside of this definition or declaration 279 | struct ftrace_ops *op, struct ftrace_regs *fregs); | ^~~~~~~~~~~ kernel/trace/trace_irqsoff.c:141:37: warning: 'struct ftrace_regs' declared inside parameter list will not be visible outside of this definition or declaration 141 | struct ftrace_ops *op, struct ftrace_regs *fregs) | ^~~~~~~~~~~ kernel/trace/trace_irqsoff.c: In function '__irqsoff_tracer_init': 571 | ftrace_init_array_ops(tr, irqsoff_tracer_call); | ^~~~~~~~~~~~~~~~~~~ | | | void (*)(long unsigned int, long unsigned int, struct ftrace_ops *, struct ftrace_regs *) In file included from kernel/trace/trace_irqsoff.c:19: kernel/trace/trace.h:975:66: note: expected 'ftrace_func_t' {aka 'void (*)(long unsigned int, long unsigned int, struct ftrace_ops *, struct ftrace_regs *)'} but argument is of type 'void (*)(long unsigned int, long unsigned int, struct ftrace_ops *, struct ftrace_regs *)' 975 | void ftrace_init_array_ops(struct trace_array *tr, ftrace_func_t func); | ~~~~~~~~~~~~~~^~~~ cc1: some warnings being treated as errors vim +/ftrace_init_array_ops +571 kernel/trace/trace_irqsoff.c 02f2f7646fd5d04 Steven Rostedt (Red Hat 2014-01-14 554) 02f2f7646fd5d04 Steven Rostedt (Red Hat 2014-01-14 555) static int __irqsoff_tracer_init(struct trace_array *tr) 81d68a96a398448 Steven Rostedt 2008-05-12 556 { 02f2f7646fd5d04 Steven Rostedt (Red Hat 2014-01-14 557) if (irqsoff_busy) 02f2f7646fd5d04 Steven Rostedt (Red Hat 2014-01-14 558) return -EBUSY; 02f2f7646fd5d04 Steven Rostedt (Red Hat 2014-01-14 559) 983f938ae695852 Steven Rostedt (Red Hat 2015-09-30 560) save_flags = tr->trace_flags; 613f04a0f51e6e6 Steven Rostedt (Red Hat 2013-03-14 561) 613f04a0f51e6e6 Steven Rostedt (Red Hat 2013-03-14 562) /* non overwrite screws up the latency tracers */ 2b6080f28c7cc3e Steven Rostedt 2012-05-11 563 set_tracer_flag(tr, TRACE_ITER_OVERWRITE, 1); 2b6080f28c7cc3e Steven Rostedt 2012-05-11 564 set_tracer_flag(tr, TRACE_ITER_LATENCY_FMT, 1); e9d25fe6eaa2c72 Steven Rostedt 2009-03-04 565 6d9b3fa5e7f663b Steven Rostedt (Red Hat 2014-01-14 566) tr->max_latency = 0; 81d68a96a398448 Steven Rostedt 2008-05-12 567 irqsoff_trace = tr; c5f888cae49dfe3 Steven Rostedt 2008-05-12 568 /* make sure that the tracer is visible */ 81d68a96a398448 Steven Rostedt 2008-05-12 569 smp_wmb(); 62b915f1060996a Jiri Olsa 2010-04-02 570 4104d326b670c2b Steven Rostedt (Red Hat 2014-01-10 @571) ftrace_init_array_ops(tr, irqsoff_tracer_call); 4104d326b670c2b Steven Rostedt (Red Hat 2014-01-10 572) 4104d326b670c2b Steven Rostedt (Red Hat 2014-01-10 573) /* Only toplevel instance supports graph tracing */ 4104d326b670c2b Steven Rostedt (Red Hat 2014-01-10 574) if (start_irqsoff_tracer(tr, (tr->flags & TRACE_ARRAY_FL_GLOBAL && 983f938ae695852 Steven Rostedt (Red Hat 2015-09-30 575) is_graph(tr)))) 62b915f1060996a Jiri Olsa 2010-04-02 576 printk(KERN_ERR "failed to start irqsoff tracer\n"); 02f2f7646fd5d04 Steven Rostedt (Red Hat 2014-01-14 577) 02f2f7646fd5d04 Steven Rostedt (Red Hat 2014-01-14 578) irqsoff_busy = true; 02f2f7646fd5d04 Steven Rostedt (Red Hat 2014-01-14 579) return 0; 81d68a96a398448 Steven Rostedt 2008-05-12 580 } 81d68a96a398448 Steven Rostedt 2008-05-12 581 :::::: The code at line 571 was first introduced by commit :::::: 4104d326b670c2b66f575d2004daa28b2d1b4c8d ftrace: Remove global function list and call function directly :::::: TO: Steven Rostedt (Red Hat) <rostedt(a)goodmis.org&gt; :::::: CC: Steven Rostedt <rostedt(a)goodmis.org&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org