[akpm-mm:mm-unstable 69/80] lib/maple_tree.c:4707:7: warning: no previous prototype for 'mas_next_slot'

[kernel test robot <lkp@xxxxxxxxx>]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-unstable
head:   f96b65aa15baec616fffdb8f1d4fa3222aa56467
commit: 1e8cbef07336eef8f8f0062e90891ca0be8b76f4 [69/80] maple_tree: introduce mas_next_slot() interface
config: arc-randconfig-r043-20230502 (https://download.01.org/0day-ci/archive/20230506/202305061915.epYY0WJ5-lkp@xxxxxxxxx/config)
compiler: arceb-elf-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://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git/commit/?id=1e8cbef07336eef8f8f0062e90891ca0be8b76f4
        git remote add akpm-mm https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git
        git fetch --no-tags akpm-mm mm-unstable
        git checkout 1e8cbef07336eef8f8f0062e90891ca0be8b76f4
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=arc olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=arc SHELL=/bin/bash

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@xxxxxxxxx>
| Link: https://lore.kernel.org/oe-kbuild-all/202305061915.epYY0WJ5-lkp@xxxxxxxxx/

All warnings (new ones prefixed by >>):

>> lib/maple_tree.c:4707:7: warning: no previous prototype for 'mas_next_slot' [-Wmissing-prototypes]
    4707 | void *mas_next_slot(struct ma_state *mas, unsigned long max, bool empty)
         |       ^~~~~~~~~~~~~


vim +/mas_next_slot +4707 lib/maple_tree.c

  4697	
  4698	/*
  4699	 * mas_next_slot() - Get the entry in the next slot
  4700	 *
  4701	 * @mas: The maple state
  4702	 * @max: The maximum starting range
  4703	 * @empty: Can be empty
  4704	 *
  4705	 * Return: The entry in the next slot which is possibly NULL
  4706	 */
> 4707	void *mas_next_slot(struct ma_state *mas, unsigned long max, bool empty)
  4708	{
  4709		void __rcu **slots;
  4710		unsigned long *pivots;
  4711		unsigned long pivot;
  4712		enum maple_type type;
  4713		struct maple_node *node;
  4714		unsigned char data_end;
  4715		unsigned long save_point = mas->last;
  4716		void *entry;
  4717	
  4718	retry:
  4719		node = mas_mn(mas);
  4720		type = mte_node_type(mas->node);
  4721		pivots = ma_pivots(node, type);
  4722		data_end = ma_data_end(node, type, pivots, mas->max);
  4723		if (unlikely(mas_rewalk_if_dead(mas, node, save_point)))
  4724			goto retry;
  4725	
  4726	again:
  4727		if (mas->max >= max) {
  4728			if (likely(mas->offset < data_end))
  4729				pivot = pivots[mas->offset];
  4730			else
  4731				return NULL; /* must be mas->max */
  4732	
  4733			if (unlikely(mas_rewalk_if_dead(mas, node, save_point)))
  4734				goto retry;
  4735	
  4736			if (pivot >= max)
  4737				return NULL;
  4738		}
  4739	
  4740		if (likely(mas->offset < data_end)) {
  4741			mas->index = pivots[mas->offset] + 1;
  4742			mas->offset++;
  4743			if (likely(mas->offset < data_end))
  4744				mas->last = pivots[mas->offset];
  4745			else
  4746				mas->last = mas->max;
  4747		} else  {
  4748			if (mas_next_node(mas, node, max)) {
  4749				mas_rewalk(mas, save_point);
  4750				goto retry;
  4751			}
  4752	
  4753			if (mas_is_none(mas))
  4754				return NULL;
  4755	
  4756			mas->offset = 0;
  4757			mas->index = mas->min;
  4758			node = mas_mn(mas);
  4759			type = mte_node_type(mas->node);
  4760			pivots = ma_pivots(node, type);
  4761			mas->last = pivots[0];
  4762		}
  4763	
  4764		slots = ma_slots(node, type);
  4765		entry = mt_slot(mas->tree, slots, mas->offset);
  4766		if (unlikely(mas_rewalk_if_dead(mas, node, save_point)))
  4767			goto retry;
  4768	
  4769		if (entry)
  4770			return entry;
  4771	
  4772		if (!empty) {
  4773			if (!mas->offset)
  4774				data_end = 2;
  4775			goto again;
  4776		}
  4777	
  4778		return entry;
  4779	}
  4780	

-- 
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