kallsyms_on_each_symbol
int kallsyms_on_each_symbol(int (*fn)(void *, const char *, unsigned long),
kallsyms_on_each_symbol(stat_symbol_len, &total_len);
kallsyms_on_each_symbol(lookup_name, &stat);
kallsyms_on_each_symbol(find_symbol, &stat);
kallsyms_on_each_symbol(find_symbol, stat);
kallsyms_on_each_symbol(find_symbol, stat2);
ret = kallsyms_on_each_symbol(filter_match_callback, &match);
found_all = kallsyms_on_each_symbol(kallsyms_callback, &args);