Hi Yizhen, FYI, the error/warning still remains. tree: https://gitee.com/openeuler/kernel.git OLK-5.10 head: 929a9df37c1b7dec73fd417d79a116d02a8f9380 commit: f6206cf05e28a7f455850a4e2de8162890f50073 [2516/2516] ub: add memory map api in ubcore config: arm64-randconfig-003-20241203 (https://download.01.org/0day-ci/archive/20241203/202412030455.2cb7zJmc-lkp@i...) compiler: aarch64-linux-gcc (GCC) 14.2.0 reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20241203/202412030455.2cb7zJmc-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/202412030455.2cb7zJmc-lkp@intel.com/ All warnings (new ones prefixed by >>):

...

drivers/ub/urma/ubcore/ubcore_umem.c:227:21: warning: no previous prototype for 'ubcore_umem_get' [-Wmissing-prototypes] 227 | struct ubcore_umem *ubcore_umem_get(struct ubcore_device *dev, uint64_t va, uint64_t len, | ^~~~~~~~~~~~~~~ drivers/ub/urma/ubcore/ubcore_umem.c:245:6: warning: no previous prototype for 'ubcore_umem_release' [-Wmissing-prototypes] 245 | void ubcore_umem_release(struct ubcore_umem *umem) | ^~~~~~~~~~~~~~~~~~~

vim +/ubcore_umem_get +227 drivers/ub/urma/ubcore/ubcore_umem.c 226

227 struct ubcore_umem *ubcore_umem_get(struct ubcore_device *dev, uint64_t va, uint64_t len, 228 union ubcore_umem_flag flag) 229 { 230 struct page **page_list; 231 int ret; 232 233 ret = umem_verify_input(dev, va, len, flag); 234 if (ret < 0) 235 return ERR_PTR(ret); 236 237 page_list = (struct page **)__get_free_page(GFP_KERNEL); 238 if (page_list == 0) 239 return ERR_PTR(-ENOMEM); 240 241 return ubcore_get_target_umem(dev, va, len, flag, page_list); 242 } 243 EXPORT_SYMBOL(ubcore_umem_get); 244 245 void ubcore_umem_release(struct ubcore_umem *umem)

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