Hi Xu,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on bpf-next/master]

url:    https://github.com/intel-lab-lkp/linux/commits/Xu-Kuohai/Add-ftrace-direct-call-for-arm64/20220913-142654
base:   https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git master
config: mips-allyesconfig
compiler: mips-linux-gcc (GCC) 12.1.0
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://github.com/intel-lab-lkp/linux/commit/221b091bce215aac53296079222741e6568a23e0
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Xu-Kuohai/Add-ftrace-direct-call-for-arm64/20220913-142654
        git checkout 221b091bce215aac53296079222741e6568a23e0
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=mips SHELL=/bin/bash kernel/trace/

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

All warnings (new ones prefixed by >>):

   kernel/trace/ftrace.c:299:5: warning: no previous prototype for '__register_ftrace_function' [-Wmissing-prototypes]
     299 | int __register_ftrace_function(struct ftrace_ops *ops)
         |     ^~~~~~~~~~~~~~~~~~~~~~~~~~
   kernel/trace/ftrace.c:342:5: warning: no previous prototype for '__unregister_ftrace_function' [-Wmissing-prototypes]
     342 | int __unregister_ftrace_function(struct ftrace_ops *ops)
         |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
   kernel/trace/ftrace.c:3999:15: warning: no previous prototype for 'arch_ftrace_match_adjust' [-Wmissing-prototypes]
    3999 | char * __weak arch_ftrace_match_adjust(char *str, const char *search)
         |               ^~~~~~~~~~~~~~~~~~~~~~~~
>> kernel/trace/ftrace.c:6632:20: warning: no previous prototype for 'ftrace_rec_arch_init' [-Wmissing-prototypes]
    6632 | void __init __weak ftrace_rec_arch_init(struct dyn_ftrace *rec,
         |                    ^~~~~~~~~~~~~~~~~~~~


vim +/ftrace_rec_arch_init +6632 kernel/trace/ftrace.c

  6631	
> 6632	void __init __weak ftrace_rec_arch_init(struct dyn_ftrace *rec,
  6633						unsigned long addr)
  6634	{
  6635	}
  6636	

-- 
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https://01.org/lkp