[openeuler:OLK-6.6 1897/1897] mm/madvise.c:297:6: warning: no previous prototype for 'force_swapin_vma'

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

Hi Liu,

FYI, the error/warning still remains.

tree:   https://gitee.com/openeuler/kernel.git OLK-6.6
head:   fdc8c83a12a8fc4b7c55971d552758ffe2f34c14
commit: 92a0eb9bde6c03412b39f9f3d20968c091ea3b46 [1897/1897] memcg: introduce per-memcg swapin interface
config: x86_64-alldefconfig (https://download.01.org/0day-ci/archive/20250207/202502071345.oFOjxkvF-lkp@intel.com/config)
compiler: gcc-12 (Debian 12.2.0-14) 12.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250207/202502071345.oFOjxkvF-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/202502071345.oFOjxkvF-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> mm/madvise.c:297:6: warning: no previous prototype for 'force_swapin_vma' [-Wmissing-prototypes]
     297 | void force_swapin_vma(struct vm_area_struct *vma)
         |      ^~~~~~~~~~~~~~~~


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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