Hi leoliu-oc, FYI, the error/warning still remains. tree: https://gitee.com/openeuler/kernel.git OLK-6.6 head: dc90c923fed4944f134644261022885c12631518 commit: 8eaba08b2d72718a40cafe3402ab4f26b0dc62eb [2687/2687] x86/cpu/zhaoxin: Encapsulate access to global variables within functions config: x86_64-buildonly-randconfig-2004-20250818 (https://download.01.org/0day-ci/archive/20250818/202508181643.2giEZ0ax-lkp@i...) 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/20250818/202508181643.2giEZ0ax-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/202508181643.2giEZ0ax-lkp@intel.com/ All warnings (new ones prefixed by >>): In file included from arch/x86/kernel/early-quirks.c:13: In file included from include/linux/pci.h:1666: In file included from include/linux/dmapool.h:14: In file included from include/linux/scatterlist.h:8: In file included from include/linux/mm.h:2235: 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_" | ~~~~~~~~~~~ ^ ~~~

...

arch/x86/kernel/early-quirks.c:722:6: warning: no previous prototype for function 'is_zhaoxin_kh40000' [-Wmissing-prototypes] 722 | bool is_zhaoxin_kh40000(void) | ^ arch/x86/kernel/early-quirks.c:722:1: note: declare 'static' if the function is not intended to be used outside of this translation unit 722 | bool is_zhaoxin_kh40000(void) | ^ | static arch/x86/kernel/early-quirks.c:737:14: error: use of undeclared identifier 'kh40000_dma_direct_ops' 737 | dma_ops = &kh40000_dma_direct_ops; | ^ 2 warnings and 1 error generated. -- In file included from kernel/dma/contiguous.c:48: In file included from include/linux/memblock.h:12: In file included from include/linux/mm.h:2235: 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_" | ~~~~~~~~~~~ ^ ~~~ kernel/dma/contiguous.c:209:13: warning: no previous prototype for function 'is_zhaoxin_kh40000' [-Wmissing-prototypes] 209 | bool __weak is_zhaoxin_kh40000(void) | ^ kernel/dma/contiguous.c:209:1: note: declare 'static' if the function is not intended to be used outside of this translation unit 209 | bool __weak is_zhaoxin_kh40000(void) | ^ | static 2 warnings generated.

vim +/is_zhaoxin_kh40000 +722 arch/x86/kernel/early-quirks.c 721

722 bool is_zhaoxin_kh40000(void) 723 { 724 return zhaoxin_kh40000; 725 } 726

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