linux-kernel - [intel-tdx:kvm-upstream 107/152] arch/x86/kvm/vmx/tdx_stubs.c:13:12: warning: no previous prototype for function 'tdx_vcpu

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Message-ID: <202112171042.JZamNPE0-lkp@intel.com>
Date:   Fri, 17 Dec 2021 10:31:26 +0800
From:   kernel test robot <lkp@...el.com>
To:     Isaku Yamahata <isaku.yamahata@...el.com>
Cc:     llvm@...ts.linux.dev, kbuild-all@...ts.01.org,
        linux-kernel@...r.kernel.org
Subject: [intel-tdx:kvm-upstream 107/152] arch/x86/kvm/vmx/tdx_stubs.c:13:12:
 warning: no previous prototype for function 'tdx_vcpu_run'

tree:   https://github.com/intel/tdx.git kvm-upstream
head:   bdfe06c17daab60c196ff80c1d98467a1d3734fa
commit: 4dce28ae6facd2c06b513bc1e6fa48e397438a3a [107/152] KVM: TDX: Implement TDX vcpu enter/exit path
config: x86_64-randconfig-a013-20211216 (https://download.01.org/0day-ci/archive/20211217/202112171042.JZamNPE0-lkp@intel.com/config)
compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project dd245bab9fbb364faa1581e4f92ba3119a872fba)
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
        # https://github.com/intel/tdx/commit/4dce28ae6facd2c06b513bc1e6fa48e397438a3a
        git remote add intel-tdx https://github.com/intel/tdx.git
        git fetch --no-tags intel-tdx kvm-upstream
        git checkout 4dce28ae6facd2c06b513bc1e6fa48e397438a3a
        # save the config file to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash arch/x86/kvm/

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@...el.com>

All warnings (new ones prefixed by >>):

   arch/x86/kvm/vmx/tdx_stubs.c:4:13: warning: no previous prototype for function 'tdx_pre_kvm_init' [-Wmissing-prototypes]
   void __init tdx_pre_kvm_init(unsigned int *vcpu_size,
               ^
   arch/x86/kvm/vmx/tdx_stubs.c:4:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   void __init tdx_pre_kvm_init(unsigned int *vcpu_size,
   ^
   static 
   arch/x86/kvm/vmx/tdx_stubs.c:6:12: warning: no previous prototype for function 'tdx_hardware_setup' [-Wmissing-prototypes]
   int __init tdx_hardware_setup(struct kvm_x86_ops *x86_ops) { return -EOPNOTSUPP; }
              ^
   arch/x86/kvm/vmx/tdx_stubs.c:6:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   int __init tdx_hardware_setup(struct kvm_x86_ops *x86_ops) { return -EOPNOTSUPP; }
   ^
   static 
   arch/x86/kvm/vmx/tdx_stubs.c:7:6: warning: no previous prototype for function 'tdx_hardware_enable' [-Wmissing-prototypes]
   void tdx_hardware_enable(void) {}
        ^
   arch/x86/kvm/vmx/tdx_stubs.c:7:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   void tdx_hardware_enable(void) {}
   ^
   static 
   arch/x86/kvm/vmx/tdx_stubs.c:8:6: warning: no previous prototype for function 'tdx_hardware_disable' [-Wmissing-prototypes]
   void tdx_hardware_disable(void) {}
        ^
   arch/x86/kvm/vmx/tdx_stubs.c:8:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   void tdx_hardware_disable(void) {}
   ^
   static 
   arch/x86/kvm/vmx/tdx_stubs.c:10:5: warning: no previous prototype for function 'tdx_vcpu_create' [-Wmissing-prototypes]
   int tdx_vcpu_create(struct kvm_vcpu *vcpu) { return -EOPNOTSUPP; }
       ^
   arch/x86/kvm/vmx/tdx_stubs.c:10:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   int tdx_vcpu_create(struct kvm_vcpu *vcpu) { return -EOPNOTSUPP; }
   ^
   static 
   arch/x86/kvm/vmx/tdx_stubs.c:11:6: warning: no previous prototype for function 'tdx_vcpu_free' [-Wmissing-prototypes]
   void tdx_vcpu_free(struct kvm_vcpu *vcpu) {}
        ^
   arch/x86/kvm/vmx/tdx_stubs.c:11:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   void tdx_vcpu_free(struct kvm_vcpu *vcpu) {}
   ^
   static 
   arch/x86/kvm/vmx/tdx_stubs.c:12:6: warning: no previous prototype for function 'tdx_vcpu_reset' [-Wmissing-prototypes]
   void tdx_vcpu_reset(struct kvm_vcpu *vcpu, bool init_event) {}
        ^
   arch/x86/kvm/vmx/tdx_stubs.c:12:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   void tdx_vcpu_reset(struct kvm_vcpu *vcpu, bool init_event) {}
   ^
   static 
>> arch/x86/kvm/vmx/tdx_stubs.c:13:12: warning: no previous prototype for function 'tdx_vcpu_run' [-Wmissing-prototypes]
   fastpath_t tdx_vcpu_run(struct kvm_vcpu *vcpu) { return EXIT_FASTPATH_NONE; }
              ^
   arch/x86/kvm/vmx/tdx_stubs.c:13:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   fastpath_t tdx_vcpu_run(struct kvm_vcpu *vcpu) { return EXIT_FASTPATH_NONE; }
   ^
   static 
>> arch/x86/kvm/vmx/tdx_stubs.c:14:6: warning: no previous prototype for function 'tdx_vcpu_load' [-Wmissing-prototypes]
   void tdx_vcpu_load(struct kvm_vcpu *vcpu, int cpu) {}
        ^
   arch/x86/kvm/vmx/tdx_stubs.c:14:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   void tdx_vcpu_load(struct kvm_vcpu *vcpu, int cpu) {}
   ^
   static 
>> arch/x86/kvm/vmx/tdx_stubs.c:15:6: warning: no previous prototype for function 'tdx_vcpu_put' [-Wmissing-prototypes]
   void tdx_vcpu_put(struct kvm_vcpu *vcpu) {}
        ^
   arch/x86/kvm/vmx/tdx_stubs.c:15:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   void tdx_vcpu_put(struct kvm_vcpu *vcpu) {}
   ^
   static 
>> arch/x86/kvm/vmx/tdx_stubs.c:16:6: warning: no previous prototype for function 'tdx_prepare_switch_to_guest' [-Wmissing-prototypes]
   void tdx_prepare_switch_to_guest(struct kvm_vcpu *vcpu) {}
        ^
   arch/x86/kvm/vmx/tdx_stubs.c:16:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   void tdx_prepare_switch_to_guest(struct kvm_vcpu *vcpu) {}
   ^
   static 
   arch/x86/kvm/vmx/tdx_stubs.c:18:5: warning: no previous prototype for function 'tdx_dev_ioctl' [-Wmissing-prototypes]
   int tdx_dev_ioctl(void __user *argp) { return -EOPNOTSUPP; }
       ^
   arch/x86/kvm/vmx/tdx_stubs.c:18:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   int tdx_dev_ioctl(void __user *argp) { return -EOPNOTSUPP; }
   ^
   static 
   arch/x86/kvm/vmx/tdx_stubs.c:19:5: warning: no previous prototype for function 'tdx_vm_ioctl' [-Wmissing-prototypes]
   int tdx_vm_ioctl(struct kvm *kvm, void __user *argp) { return -EOPNOTSUPP; }
       ^
   arch/x86/kvm/vmx/tdx_stubs.c:19:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   int tdx_vm_ioctl(struct kvm *kvm, void __user *argp) { return -EOPNOTSUPP; }
   ^
   static 
   arch/x86/kvm/vmx/tdx_stubs.c:20:72: error: use of undeclared identifier 'ENOPNOTSUPP'
   int tdx_vcpu_ioctl(struct kvm_vcpu *vcpu, void __user *argp) { return -ENOPNOTSUPP; }
                                                                          ^
   arch/x86/kvm/vmx/tdx_stubs.c:20:5: warning: no previous prototype for function 'tdx_vcpu_ioctl' [-Wmissing-prototypes]
   int tdx_vcpu_ioctl(struct kvm_vcpu *vcpu, void __user *argp) { return -ENOPNOTSUPP; }
       ^
   arch/x86/kvm/vmx/tdx_stubs.c:20:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   int tdx_vcpu_ioctl(struct kvm_vcpu *vcpu, void __user *argp) { return -ENOPNOTSUPP; }
   ^
   static 
   arch/x86/kvm/vmx/tdx_stubs.c:22:6: warning: no previous prototype for function 'tdx_flush_tlb' [-Wmissing-prototypes]
   void tdx_flush_tlb(struct kvm_vcpu *vcpu) {}
        ^
   arch/x86/kvm/vmx/tdx_stubs.c:22:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   void tdx_flush_tlb(struct kvm_vcpu *vcpu) {}
   ^
   static 
   arch/x86/kvm/vmx/tdx_stubs.c:23:6: warning: no previous prototype for function 'tdx_load_mmu_pgd' [-Wmissing-prototypes]
   void tdx_load_mmu_pgd(struct kvm_vcpu *vcpu, hpa_t root_hpa, int root_level) {}
        ^
   arch/x86/kvm/vmx/tdx_stubs.c:23:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   void tdx_load_mmu_pgd(struct kvm_vcpu *vcpu, hpa_t root_hpa, int root_level) {}
   ^
   static 
   16 warnings and 1 error generated.


vim +/tdx_vcpu_run +13 arch/x86/kvm/vmx/tdx_stubs.c

     9	
    10	int tdx_vcpu_create(struct kvm_vcpu *vcpu) { return -EOPNOTSUPP; }
    11	void tdx_vcpu_free(struct kvm_vcpu *vcpu) {}
    12	void tdx_vcpu_reset(struct kvm_vcpu *vcpu, bool init_event) {}
  > 13	fastpath_t tdx_vcpu_run(struct kvm_vcpu *vcpu) { return EXIT_FASTPATH_NONE; }
  > 14	void tdx_vcpu_load(struct kvm_vcpu *vcpu, int cpu) {}
  > 15	void tdx_vcpu_put(struct kvm_vcpu *vcpu) {}
  > 16	void tdx_prepare_switch_to_guest(struct kvm_vcpu *vcpu) {}
    17	

---
0-DAY CI Kernel Test Service, Intel Corporation
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