linux-kernel - [intel-tdx:guest-hardening-rebased 11/23] arch/x86/coco/tdx/tdx.c:297:14: warning: no previous prototype for 'tdx_write

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Date:   Fri, 8 Jul 2022 08:02:24 +0800
From:   kernel test robot <lkp@...el.com>
To:     Andi Kleen <ak@...ux.intel.com>
Cc:     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 11/23]
 arch/x86/coco/tdx/tdx.c:297:14: warning: no previous prototype for
 'tdx_write_msr'

tree:   https://github.com/intel/tdx.git guest-hardening-rebased
head:   64a4c4e66ca9cce1ca55de6d801f32284fbf7c8e
commit: d1a7216a37f68b347a3622a0c8498134d5cb8970 [11/23] x86/tdx: Use direct paravirt call for wrmsrl
config: x86_64-allyesconfig (https://download.01.org/0day-ci/archive/20220708/202207080723.aRk54tCZ-lkp@intel.com/config)
compiler: gcc-11 (Debian 11.3.0-3) 11.3.0
reproduce (this is a W=1 build):
        # https://github.com/intel/tdx/commit/d1a7216a37f68b347a3622a0c8498134d5cb8970
        git remote add intel-tdx https://github.com/intel/tdx.git
        git fetch --no-tags intel-tdx guest-hardening-rebased
        git checkout d1a7216a37f68b347a3622a0c8498134d5cb8970
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash arch/x86/coco/tdx/ arch/x86/mm/

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:297:14: warning: no previous prototype for 'tdx_write_msr' [-Wmissing-prototypes]
     297 | void notrace tdx_write_msr(unsigned int msr, u32 low, u32 high)
         |              ^~~~~~~~~~~~~


vim +/tdx_write_msr +297 arch/x86/coco/tdx/tdx.c

   296	
 > 297	void notrace tdx_write_msr(unsigned int msr, u32 low, u32 high)
   298	{
   299		struct tdx_hypercall_args args = {
   300			.r10 = TDX_HYPERCALL_STANDARD,
   301			.r11 = hcall_func(EXIT_REASON_MSR_WRITE),
   302			.r12 = msr,
   303			.r13 = (u64)high << 32 | low,
   304		};
   305	
   306		if (tdx_fast_tdcall_path_msr(msr))
   307			__tdx_hypercall(&args, 0);
   308		else
   309			native_write_msr(msr, low, high);
   310	}
   311	

-- 
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https://01.org/lkp