[mark:arm64/ftrace/per-callsite-ops 1/6] kernel/trace/fgraph.c:37:12: warning: no previous prototype for 'ftrace_enable_ftrace_graph_caller'

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/mark/linux.git arm64/ftrace/per-callsite-ops
head:   2aaba224d039a36f7eca5ad68c77686d3546e4fa
commit: 718b0fd1ccf6f04340cb3ad48b667ca05bb7a31c [1/6] ftrace: cleanup ftrace_graph_caller enable and disable
config: sh-buildonly-randconfig-r002-20220428 (https://download.01.org/0day-ci/archive/20220430/202204300758.ces9aD6G-lkp@xxxxxxxxx/config)
compiler: sh4-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/mark/linux.git/commit/?id=718b0fd1ccf6f04340cb3ad48b667ca05bb7a31c
        git remote add mark https://git.kernel.org/pub/scm/linux/kernel/git/mark/linux.git
        git fetch --no-tags mark arm64/ftrace/per-callsite-ops
        git checkout 718b0fd1ccf6f04340cb3ad48b667ca05bb7a31c
        # 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=sh SHELL=/bin/bash kernel/trace/

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

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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