[linux-next:master 7006/8600] kernel/trace/fgraph.c:37:12: warning: no previous prototype for 'ftrace_enable_ftrace_graph_caller'

[kernel test robot <lkp@intel.com>]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
head:   bb6ee10133faa3c4742ab8343b5e488cdb29445e
commit: e999995c84c3abb6dcae83f8c35942a8d4ee0451 [7006/8600] ftrace: cleanup ftrace_graph_caller enable and disable
config: microblaze-buildonly-randconfig-r006-20220504 (https://download.01.org/0day-ci/archive/20220505/202205050438.jIyxoMNu-lkp@intel.com/config)
compiler: microblaze-linux-gcc (GCC) 11.3.0
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/next/linux-next.git/commit/?id=e999995c84c3abb6dcae83f8c35942a8d4ee0451
        git remote add linux-next https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
        git fetch --no-tags linux-next master
        git checkout e999995c84c3abb6dcae83f8c35942a8d4ee0451
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.3.0 make.cross W=1 O=build_dir ARCH=microblaze SHELL=/bin/bash kernel/trace/

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All warnings (new ones prefixed by >>):

>> kernel/trace/fgraph.c:37:12: warning: no previous prototype for 'ftrace_enable_ftrace_graph_caller' [-Wmissing-prototypes]
      37 | int __weak ftrace_enable_ftrace_graph_caller(void)
         |            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>> kernel/trace/fgraph.c:46:12: warning: no previous prototype for 'ftrace_disable_ftrace_graph_caller' [-Wmissing-prototypes]
      46 | int __weak ftrace_disable_ftrace_graph_caller(void)
         |            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   kernel/trace/fgraph.c:241:15: warning: no previous prototype for 'ftrace_return_to_handler' [-Wmissing-prototypes]
     241 | unsigned long ftrace_return_to_handler(unsigned long frame_pointer)
         |               ^~~~~~~~~~~~~~~~~~~~~~~~
   kernel/trace/fgraph.c:356:6: warning: no previous prototype for 'ftrace_graph_sleep_time_control' [-Wmissing-prototypes]
     356 | void ftrace_graph_sleep_time_control(bool enable)
         |      ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~


vim +/ftrace_enable_ftrace_graph_caller +37 kernel/trace/fgraph.c

    32	
    33	/*
    34	 * archs can override this function if they must do something
    35	 * to enable hook for graph tracer.
    36	 */
  > 37	int __weak ftrace_enable_ftrace_graph_caller(void)
    38	{
    39		return 0;
    40	}
    41	
    42	/*
    43	 * archs can override this function if they must do something
    44	 * to disable hook for graph tracer.
    45	 */
  > 46	int __weak ftrace_disable_ftrace_graph_caller(void)
    47	{
    48		return 0;
    49	}
    50	

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