Re: [PATCH] ftrace: Fix stack trace entry generated by ftrace_pid_func()

[kernel test robot]

Hi Tatsuya,

kernel test robot noticed the following build warnings:

[auto build test WARNING on linus/master]
[also build test WARNING on rostedt-trace/for-next v6.9 next-20240523]
[cannot apply to rostedt-trace/for-next-urgent]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Tatsuya-S/ftrace-Fix-stack-trace-entry-generated-by-ftrace_pid_func/20240526-193149
base:   linus/master
patch link:    https://lore.kernel.org/r/20240526112658.46740-1-tatsuya.s2862%40gmail.com
patch subject: [PATCH] ftrace: Fix stack trace entry generated by ftrace_pid_func()
config: x86_64-buildonly-randconfig-002-20240526 (https://download.01.org/0day-ci/archive/20240526/202405262232.L4XH8q6O-lkp@xxxxxxxxx/config)
compiler: clang version 18.1.5 (https://github.com/llvm/llvm-project 617a15a9eac96088ae5e9134248d8236e34b91b1)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240526/202405262232.L4XH8q6O-lkp@xxxxxxxxx/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@xxxxxxxxx>
| Closes: https://lore.kernel.org/oe-kbuild-all/202405262232.L4XH8q6O-lkp@xxxxxxxxx/

All warnings (new ones prefixed by >>):

>> kernel/trace/ftrace.c:102:6: warning: no previous prototype for function 'ftrace_pids_enabled' [-Wmissing-prototypes]
     102 | bool ftrace_pids_enabled(struct ftrace_ops *ops)
         |      ^
   kernel/trace/ftrace.c:102:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
     102 | bool ftrace_pids_enabled(struct ftrace_ops *ops)
         | ^
         | static 
   1 warning generated.


vim +/ftrace_pids_enabled +102 kernel/trace/ftrace.c

   101	
 > 102	bool ftrace_pids_enabled(struct ftrace_ops *ops)
   103	{
   104		struct trace_array *tr;
   105	
   106		if (!(ops->flags & FTRACE_OPS_FL_PID) || !ops->private)
   107			return false;
   108	
   109		tr = ops->private;
   110	
   111		return tr->function_pids != NULL || tr->function_no_pids != NULL;
   112	}
   113	

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