Hi Liu, FYI, the error/warning still remains. tree: https://gitee.com/openeuler/kernel.git OLK-6.6 head: 18ca24a6500a925830b6e87fc4279a7456b57a4b commit: 92a0eb9bde6c03412b39f9f3d20968c091ea3b46 [2790/2790] memcg: introduce per-memcg swapin interface config: arm64-randconfig-004-20250829 (https://download.01.org/0day-ci/archive/20250829/202508292223.h9TBg6O5-lkp@i...) compiler: aarch64-linux-gcc (GCC) 9.5.0 reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250829/202508292223.h9TBg6O5-lkp@i...) 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/202508292223.h9TBg6O5-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

-- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki