Hi leoliu-oc, FYI, the error/warning still remains. tree: https://gitee.com/openeuler/kernel.git OLK-6.6 head: 5930fa3740c518a9f6ba688fd0c1873d6f3adbce commit: 11557c1ae4529f133483879b7ee00b7d8c653be7 [3534/3534] x86/cpu/zhaoxin: Encapsulate access to kh40000_dma_direct_ops within function config: x86_64-allnoconfig-bpf (https://download.01.org/0day-ci/archive/20251212/202512120237.qjU2ttZI-lkp@i...) compiler: gcc-14 (Debian 14.2.0-19) 14.2.0 reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251212/202512120237.qjU2ttZI-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/202512120237.qjU2ttZI-lkp@intel.com/ All warnings (new ones prefixed by >>): arch/x86/kernel/early-quirks.c:722:6: warning: no previous prototype for 'is_zhaoxin_kh40000' [-Wmissing-prototypes] 722 | bool is_zhaoxin_kh40000(void) | ^~~~~~~~~~~~~~~~~~

...

arch/x86/kernel/early-quirks.c:727:34: warning: no previous prototype for 'kh40000_get_direct_dma_ops' [-Wmissing-prototypes] 727 | __weak const struct dma_map_ops *kh40000_get_direct_dma_ops(void) | ^~~~~~~~~~~~~~~~~~~~~~~~~~

vim +/kh40000_get_direct_dma_ops +727 arch/x86/kernel/early-quirks.c 726

727 __weak const struct dma_map_ops *kh40000_get_direct_dma_ops(void) 728 { 729 return dma_ops; 730 } 731

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