[mark:stacktrace/testing 1/1] lib/test_stacktrace/kunit.c:54:5: warning: no previous prototype for 'st_find_func_idx'

[mark:stacktrace/testing 1/1] lib/test_stacktrace/kunit.c:54:5: warning: no previous prototype for 'st_find_func_idx'

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/mark/linux.git stacktrace/testing
head:   a8e8825116626f8c3e8be3bb889b6442a7465cb8
commit: a8e8825116626f8c3e8be3bb889b6442a7465cb8 [1/1] WIP: stacktrace tests
config: alpha-allyesconfig (https://download.01.org/0day-ci/archive/20220413/202204130918.xY2l2rUd-lkp@intel.com/config)
compiler: alpha-linux-gcc (GCC) 11.2.0
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=a8e8825116626f8c3e8be3bb889b6442a7465cb8
        git remote add mark https://git.kernel.org/pub/scm/linux/kernel/git/mark/linux.git
        git fetch --no-tags mark stacktrace/testing
        git checkout a8e8825116626f8c3e8be3bb889b6442a7465cb8
        # save the config file to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross O=build_dir ARCH=alpha SHELL=/bin/bash lib/test_stacktrace/

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 >>):

   lib/test_stacktrace/kunit.c: In function 'callback_st_save':
   lib/test_stacktrace/kunit.c:35:26: error: implicit declaration of function 'stack_trace_save'; did you mean 'stack_depot_save'? [-Werror=implicit-function-declaration]
      35 |         st->nr_entries = stack_trace_save(st->store, MAX_STACK_ENTRIES, 0);
         |                          ^~~~~~~~~~~~~~~~
         |                          stack_depot_save
   lib/test_stacktrace/kunit.c: At top level:
>> lib/test_stacktrace/kunit.c:54:5: warning: no previous prototype for 'st_find_func_idx' [-Wmissing-prototypes]
      54 | int st_find_func_idx(struct st_data *st, void *func, int start)
         |     ^~~~~~~~~~~~~~~~
   cc1: some warnings being treated as errors


vim +/st_find_func_idx +54 lib/test_stacktrace/kunit.c

    49	
    50	/*
    51	 * Find the index of the first instance of `func` within a trace, starting from
    52	 * `start`.
    53	 */
  > 54	int st_find_func_idx(struct st_data *st, void *func, int start)
    55	{
    56		unsigned long size;
    57		unsigned long offset;
    58		unsigned long addr = (unsigned long)func;
    59	
    60		if (!kallsyms_lookup_size_offset(addr, &size, &offset))
    61			return st->nr_entries;
    62	
    63		for (int i = start; i < st->nr_entries; i++) {
    64			unsigned long elem = st->store[i];
    65	
    66			if (elem < addr)
    67				continue;
    68			if (elem >= addr + size)
    69				continue;
    70	
    71			return i;
    72		}
    73	
    74		return st->nr_entries;
    75	}
    76	

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