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-Bug-fixes-and-summer-cleaning/20210623-020645
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/01d7a0135a12b1e0e5134d0575e424fd20d1a90f
        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@intel.com>

All warnings (new ones prefixed by >>):

>> arch/x86/kvm/mmu/mmu.c:209:26: warning: no previous prototype for function 'vcpu_to_role_regs' [-Wmissing-prototypes]
   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	
 > 209	struct kvm_mmu_role_regs vcpu_to_role_regs(struct kvm_vcpu *vcpu)
   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