[openeuler:OLK-6.6 2687/2687] mm/madvise.c:297:6: warning: no previous prototype for function 'force_swapin_vma'

[openeuler:OLK-6.6 2687/2687] mm/madvise.c:297:6: warning: no previous prototype for function 'force_swapin_vma'

[kernel test robot]

Hi Liu,

FYI, the error/warning still remains.

tree:   https://gitee.com/openeuler/kernel.git OLK-6.6
head:   08d6c0b8f95e9c676bd9bc28b12d198df722218e
commit: 92a0eb9bde6c03412b39f9f3d20968c091ea3b46 [2687/2687] memcg: introduce per-memcg swapin interface
config: x86_64-buildonly-randconfig-2003-20250818 (https://download.01.org/0day-ci/archive/20250818/202508180823.hOEzzv8k-lkp@intel.com/config)
compiler: clang version 20.1.8 (https://github.com/llvm/llvm-project 87f0227cb60147a26a1eeb4fb06e3b505e9c7261)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250818/202508180823.hOEzzv8k-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/202508180823.hOEzzv8k-lkp@intel.com/

All warnings (new ones prefixed by >>):

   In file included from mm/madvise.c:9:
   In file included from include/linux/mman.h:5:
   In file included from include/linux/mm.h:2181:
   include/linux/vmstat.h:522:36: warning: arithmetic between different enumeration types ('enum node_stat_item' and 'enum lru_list') [-Wenum-enum-conversion]
     522 |         return node_stat_name(NR_LRU_BASE + lru) + 3; // skip "nr_"
         |                               ~~~~~~~~~~~ ^ ~~~
   In file included from mm/madvise.c:21:
   include/linux/mm_inline.h:46:41: warning: arithmetic between different enumeration types ('enum node_stat_item' and 'enum lru_list') [-Wenum-enum-conversion]
      46 |         __mod_lruvec_state(lruvec, NR_LRU_BASE + lru, nr_pages);
         |                                    ~~~~~~~~~~~ ^ ~~~
   include/linux/mm_inline.h:48:22: warning: arithmetic between different enumeration types ('enum zone_stat_item' and 'enum lru_list') [-Wenum-enum-conversion]
      48 |                                 NR_ZONE_LRU_BASE + lru, nr_pages);
         |                                 ~~~~~~~~~~~~~~~~ ^ ~~~
>> mm/madvise.c:297:6: warning: no previous prototype for function 'force_swapin_vma' [-Wmissing-prototypes]
     297 | void force_swapin_vma(struct vm_area_struct *vma)
         |      ^
   mm/madvise.c:297:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
     297 | void force_swapin_vma(struct vm_area_struct *vma)
         | ^
         | static 
   4 warnings generated.


vim +/force_swapin_vma +297 mm/madvise.c

   280	
   281	#ifdef CONFIG_MEMCG_SWAP_QOS
   282	void force_swapin_vma(struct vm_area_struct *vma)
   283	{
   284		struct file *file = vma->vm_file;
   285	
   286		if (!can_madv_lru_vma(vma))
   287			return;
   288	
   289		if (!file) {
   290			walk_page_vma(vma, &swapin_walk_ops, vma);
   291			lru_add_drain();
   292		} else if (shmem_mapping(file->f_mapping))
   293			shmem_swapin_range(vma, vma->vm_start,
   294				vma->vm_end, file->f_mapping);
   295	}
   296	#else
 > 297	void force_swapin_vma(struct vm_area_struct *vma)
   298	{
   299	}
   300	#endif
   301	

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