[jolsa-perf:test 4/10] include/linux/ftrace.h:569:5: warning: no previous prototype for 'modify_ftrace_direct_hash'

[jolsa-perf:test 4/10] include/linux/ftrace.h:569:5: warning: no previous prototype for 'modify_ftrace_direct_hash'

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/jolsa/perf.git test
head:   1b7fc74c36a93e90816f58c37a84522f0949095a
commit: bbc3f1e07924e420b74b4bf49f1c3b0a924db927 [4/10] ftrace: Add modify_ftrace_direct_hash function
config: alpha-randconfig-r073-20250924 (https://download.01.org/0day-ci/archive/20250924/202509241138.BhVTtAhI-lkp@intel.com/config)
compiler: alpha-linux-gcc (GCC) 8.5.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250924/202509241138.BhVTtAhI-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202509241138.BhVTtAhI-lkp@intel.com/

All warnings (new ones prefixed by >>):

   In file included from include/linux/perf_event.h:43,
                    from include/linux/trace_events.h:10,
                    from include/trace/syscall.h:7,
                    from include/linux/syscalls.h:95,
                    from init/main.c:22:
   include/linux/ftrace.h:559:5: warning: no previous prototype for 'register_ftrace_direct_hash' [-Wmissing-prototypes]
    int register_ftrace_direct_hash(struct ftrace_ops *ops, struct ftrace_hash *hash)
        ^~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/ftrace.h:564:5: warning: no previous prototype for 'unregister_ftrace_direct_hash' [-Wmissing-prototypes]
    int unregister_ftrace_direct_hash(struct ftrace_ops *ops, struct ftrace_hash *hash)
        ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>> include/linux/ftrace.h:569:5: warning: no previous prototype for 'modify_ftrace_direct_hash' [-Wmissing-prototypes]
    int modify_ftrace_direct_hash(struct ftrace_ops *ops, struct ftrace_hash *hash, bool do_direct_lock)
        ^~~~~~~~~~~~~~~~~~~~~~~~~


vim +/modify_ftrace_direct_hash +569 include/linux/ftrace.h

   558	
 > 559	int register_ftrace_direct_hash(struct ftrace_ops *ops, struct ftrace_hash *hash)
   560	{
   561		return -ENODEV;
   562	}
   563	
   564	int unregister_ftrace_direct_hash(struct ftrace_ops *ops, struct ftrace_hash *hash)
   565	{
   566		return -ENODEV;
   567	}
   568	
 > 569	int modify_ftrace_direct_hash(struct ftrace_ops *ops, struct ftrace_hash *hash, bool do_direct_lock)
   570	{
   571		return -ENODEV;
   572	}
   573	

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