[akpm-mm:mm-unstable 360/372] include/linux/swap.h:565:6: warning: no previous prototype for 'swap_free_nr'

[kernel test robot <lkp@intel.com>]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-unstable
head:   de14d5f2a9ff2df737a01575ee95bc5a35f5853d
commit: ca23b4d4cae5d32a9d22fb3c39550dcf43df83f9 [360/372] mm: swap: introduce swap_free_nr() for batched swap_free()
config: openrisc-allnoconfig (https://download.01.org/0day-ci/archive/20240411/202404111723.YtET6RM5-lkp@intel.com/config)
compiler: or1k-linux-gcc (GCC) 13.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240411/202404111723.YtET6RM5-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/202404111723.YtET6RM5-lkp@intel.com/

All warnings (new ones prefixed by >>):

   In file included from mm/filemap.c:23:
>> include/linux/swap.h:565:6: warning: no previous prototype for 'swap_free_nr' [-Wmissing-prototypes]
     565 | void swap_free_nr(swp_entry_t entry, int nr_pages)
         |      ^~~~~~~~~~~~
--
   In file included from mm/slub.c:14:
>> include/linux/swap.h:565:6: warning: no previous prototype for 'swap_free_nr' [-Wmissing-prototypes]
     565 | void swap_free_nr(swp_entry_t entry, int nr_pages)
         |      ^~~~~~~~~~~~
   mm/slub.c: In function 'slab_post_alloc_hook':
   mm/slub.c:3831:29: warning: variable 'obj_exts' set but not used [-Wunused-but-set-variable]
    3831 |         struct slabobj_ext *obj_exts;
         |                             ^~~~~~~~


vim +/swap_free_nr +565 include/linux/swap.h

   564	
 > 565	void swap_free_nr(swp_entry_t entry, int nr_pages)
   566	{
   567	}
   568	

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