linux-kernel - [intel-tdx:kvm-upstream 73/152] arch/x86/kvm/vmx/tdx_stubs.c:6:12: warning: no previous prototype for function 'tdx_hardware

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Message-ID: <202112162216.Lu7x1lPh-lkp@intel.com>
Date:   Thu, 16 Dec 2021 22:56:38 +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 73/152] arch/x86/kvm/vmx/tdx_stubs.c:6:12:
 warning: no previous prototype for function 'tdx_hardware_setup'

tree:   https://github.com/intel/tdx.git kvm-upstream
head:   bdfe06c17daab60c196ff80c1d98467a1d3734fa
commit: 3545bcde2d72e4b5b5f16571788aac0ddb5f49a5 [73/152] KVM: TDX: Add KVM TDX system-wide initialization and teardown
config: x86_64-randconfig-a013-20211216 (https://download.01.org/0day-ci/archive/20211216/202112162216.Lu7x1lPh-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/3545bcde2d72e4b5b5f16571788aac0ddb5f49a5
        git remote add intel-tdx https://github.com/intel/tdx.git
        git fetch --no-tags intel-tdx kvm-upstream
        git checkout 3545bcde2d72e4b5b5f16571788aac0ddb5f49a5
        # 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 
   4 warnings generated.


vim +/tdx_hardware_setup +6 arch/x86/kvm/vmx/tdx_stubs.c

     3	
     4	void __init tdx_pre_kvm_init(unsigned int *vcpu_size,
     5				unsigned int *vcpu_align, unsigned int *vm_size) {}
   > 6	int __init tdx_hardware_setup(struct kvm_x86_ops *x86_ops) { return -EOPNOTSUPP; }
   > 7	void tdx_hardware_enable(void) {}
   > 8	void tdx_hardware_disable(void) {}

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org