Hi Sean, I love your patch! Perhaps something to improve: [auto build test WARNING on kvm/queue] [also build test WARNING on next-20210622] [cannot apply to linus/master vhost/linux-next v5.13-rc7] [If your patch is applied to the wrong git tree, kindly drop us a note. And when submitting patch, we suggest to use '--base' as documented in https://git-scm.com/docs/git-format-patch] url: https://github.com/0day-ci/linux/commits/Sean-Christopherson/KVM-x86-mmu-... base: https://git.kernel.org/pub/scm/virt/kvm/kvm.git queue config: x86_64-randconfig-a002-20210622 (attached as .config) compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project b3634d3e88b7f26534a5057bff182b7dced584fc) reproduce (this is a W=1 build): wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # install x86_64 cross compiling tool for clang build # apt-get install binutils-x86-64-linux-gnu # https://github.com/0day-ci/linux/commit/01d7a0135a12b1e0e5134d0575e424fd2... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Sean-Christopherson/KVM-x86-mmu-Bug-fixes-and-summer-cleaning/20210623-020645 git checkout 01d7a0135a12b1e0e5134d0575e424fd20d1a90f # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=x86_64 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>): struct kvm_mmu_role_regs vcpu_to_role_regs(struct kvm_vcpu *vcpu) ^ arch/x86/kvm/mmu/mmu.c:209:1: note: declare 'static' if the function is not intended to be used outside of this translation unit struct kvm_mmu_role_regs vcpu_to_role_regs(struct kvm_vcpu *vcpu) ^ static arch/x86/kvm/mmu/mmu.c:199:1: warning: unused function '____is_cr0_wp' [-Wunused-function] BUILD_MMU_ROLE_REGS_ACCESSOR(cr0, wp, X86_CR0_WP); ^ arch/x86/kvm/mmu/mmu.c:194:20: note: expanded from macro 'BUILD_MMU_ROLE_REGS_ACCESSOR' static inline bool ____is_##reg##_##name(struct kvm_mmu_role_regs *regs)\ ^ <scratch space>:58:1: note: expanded from here ____is_cr0_wp ^ arch/x86/kvm/mmu/mmu.c:200:1: warning: unused function '____is_cr4_pse' [-Wunused-function] BUILD_MMU_ROLE_REGS_ACCESSOR(cr4, pse, X86_CR4_PSE); ^ arch/x86/kvm/mmu/mmu.c:194:20: note: expanded from macro 'BUILD_MMU_ROLE_REGS_ACCESSOR' static inline bool ____is_##reg##_##name(struct kvm_mmu_role_regs *regs)\ ^ <scratch space>:62:1: note: expanded from here ____is_cr4_pse ^ arch/x86/kvm/mmu/mmu.c:202:1: warning: unused function '____is_cr4_smep' [-Wunused-function] BUILD_MMU_ROLE_REGS_ACCESSOR(cr4, smep, X86_CR4_SMEP); ^ arch/x86/kvm/mmu/mmu.c:194:20: note: expanded from macro 'BUILD_MMU_ROLE_REGS_ACCESSOR' static inline bool ____is_##reg##_##name(struct kvm_mmu_role_regs *regs)\ ^ <scratch space>:70:1: note: expanded from here ____is_cr4_smep ^ arch/x86/kvm/mmu/mmu.c:203:1: warning: unused function '____is_cr4_smap' [-Wunused-function] BUILD_MMU_ROLE_REGS_ACCESSOR(cr4, smap, X86_CR4_SMAP); ^ arch/x86/kvm/mmu/mmu.c:194:20: note: expanded from macro 'BUILD_MMU_ROLE_REGS_ACCESSOR' static inline bool ____is_##reg##_##name(struct kvm_mmu_role_regs *regs)\ ^ <scratch space>:74:1: note: expanded from here ____is_cr4_smap ^ arch/x86/kvm/mmu/mmu.c:204:1: warning: unused function '____is_cr4_pke' [-Wunused-function] BUILD_MMU_ROLE_REGS_ACCESSOR(cr4, pke, X86_CR4_PKE); ^ arch/x86/kvm/mmu/mmu.c:194:20: note: expanded from macro 'BUILD_MMU_ROLE_REGS_ACCESSOR' static inline bool ____is_##reg##_##name(struct kvm_mmu_role_regs *regs)\ ^ <scratch space>:78:1: note: expanded from here ____is_cr4_pke ^ arch/x86/kvm/mmu/mmu.c:205:1: warning: unused function '____is_cr4_la57' [-Wunused-function] BUILD_MMU_ROLE_REGS_ACCESSOR(cr4, la57, X86_CR4_LA57); ^ arch/x86/kvm/mmu/mmu.c:194:20: note: expanded from macro 'BUILD_MMU_ROLE_REGS_ACCESSOR' static inline bool ____is_##reg##_##name(struct kvm_mmu_role_regs *regs)\ ^ <scratch space>:82:1: note: expanded from here ____is_cr4_la57 ^ arch/x86/kvm/mmu/mmu.c:206:1: warning: unused function '____is_efer_nx' [-Wunused-function] BUILD_MMU_ROLE_REGS_ACCESSOR(efer, nx, EFER_NX); ^ arch/x86/kvm/mmu/mmu.c:194:20: note: expanded from macro 'BUILD_MMU_ROLE_REGS_ACCESSOR' static inline bool ____is_##reg##_##name(struct kvm_mmu_role_regs *regs)\ ^ <scratch space>:85:1: note: expanded from here ____is_efer_nx ^ 8 warnings generated. vim +/vcpu_to_role_regs +209 arch/x86/kvm/mmu/mmu.c 208 210 { 211 struct kvm_mmu_role_regs regs = { 212 .cr0 = kvm_read_cr0_bits(vcpu, KVM_MMU_CR0_ROLE_BITS), 213 .cr4 = kvm_read_cr4_bits(vcpu, KVM_MMU_CR4_ROLE_BITS), 214 .efer = vcpu->arch.efer, 215 }; 216 217 return regs; 218 } 219 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org