linux-kernel - [intel-tdx:guest-hardening-rebased 11/36] arch/x86/coco/tdx/tdx.c:298:14: warning: no previous prototype for function 'tdx_write

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Date:   Sat, 20 Aug 2022 08:13:49 +0800
From:   kernel test robot <lkp@...el.com>
To:     Andi Kleen <ak@...ux.intel.com>
Cc:     llvm@...ts.linux.dev, kbuild-all@...ts.01.org,
        linux-kernel@...r.kernel.org,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Kuppuswamy Sathyanarayanan 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>
Subject: [intel-tdx:guest-hardening-rebased 11/36]
 arch/x86/coco/tdx/tdx.c:298:14: warning: no previous prototype for function
 'tdx_write_msr'

arch/x86/coco/tdx/tdx.c
tree:   https://github.com/intel/tdx.git guest-hardening-rebased
head:   d941f409a509c084250b50a3b5fc1c3c84a596a0
commit: a9189da9f0413f85d9072894ccb973cf785d2c0d [11/36] x86/tdx: Use direct paravirt call for wrmsrl
config: x86_64-randconfig-a014 (https://download.01.org/0day-ci/archive/20220820/202208200851.ZfmiszQz-lkp@intel.com/config)
compiler: clang version 16.0.0 (https://github.com/llvm/llvm-project 0ac597f3cacf60479ffd36b03766fa7462dabd78)
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/a9189da9f0413f85d9072894ccb973cf785d2c0d
        git remote add intel-tdx https://github.com/intel/tdx.git
        git fetch --no-tags intel-tdx guest-hardening-rebased
        git checkout a9189da9f0413f85d9072894ccb973cf785d2c0d
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash arch/x86/coco/tdx/

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

All warnings (new ones prefixed by >>):

>> arch/x86/coco/tdx/tdx.c:298:14: warning: no previous prototype for function 'tdx_write_msr' [-Wmissing-prototypes]
   void notrace tdx_write_msr(unsigned int msr, u32 low, u32 high)
                ^
   arch/x86/coco/tdx/tdx.c:298:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   void notrace tdx_write_msr(unsigned int msr, u32 low, u32 high)
   ^
   static 
   1 warning generated.


vim +/tdx_write_msr +298 arch/x86/coco/tdx/tdx.c

   297	
 > 298	void notrace tdx_write_msr(unsigned int msr, u32 low, u32 high)
   299	{
   300		struct tdx_hypercall_args args = {
   301			.r10 = TDX_HYPERCALL_STANDARD,
   302			.r11 = hcall_func(EXIT_REASON_MSR_WRITE),
   303			.r12 = msr,
   304			.r13 = (u64)high << 32 | low,
   305		};
   306	
   307		if (tdx_fast_tdcall_path_msr(msr))
   308			__tdx_hypercall(&args, 0);
   309		else
   310			native_write_msr(msr, low, high);
   311	}
   312	

-- 
0-DAY CI Kernel Test Service
https://01.org/lkp