Hi Yang, FYI, the error/warning still remains. tree: https://gitee.com/openeuler/kernel.git OLK-6.6 head: 04473ee9ed912a16fff0d8846ad565bbf3d63c77 commit: 419da4d196ffa97d1430d017d1b36348fea395e5 [3544/3544] VirtCCA: Add CCA base operations. config: arm64-defconfig (https://download.01.org/0day-ci/archive/20251221/202512210402.xNA4HhAd-lkp@i...) compiler: aarch64-linux-gcc (GCC) 15.1.0 reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251221/202512210402.xNA4HhAd-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/202512210402.xNA4HhAd-lkp@intel.com/ All warnings (new ones prefixed by >>):

...

arch/arm64/kvm/cca_base.c:52:6: warning: no previous prototype for 'set_cca_cvm_type' [-Wmissing-prototypes] 52 | void set_cca_cvm_type(int type) | ^~~~~~~~~~~~~~~~

vim +/set_cca_cvm_type +52 arch/arm64/kvm/cca_base.c 51

52 void set_cca_cvm_type(int type) 53 { 54 cca_cvm_type = type; 55 } 56 EXPORT_SYMBOL_GPL(set_cca_cvm_type); 57

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