tree:   https://github.com/intel/tdx.git guest-hardening-rebased
head:   0eac08d9803689fc17e64f08acf8381f1c9c4a3a
commit: ab502e30ea17a59bfe49c5b6c61ba5514c28f7a4 [11/37] x86/tdx: Use direct paravirt call for wrmsrl
config: x86_64-randconfig-a013
compiler: gcc-11 (Debian 11.3.0-8) 11.3.0
reproduce (this is a W=1 build):
        # https://github.com/intel/tdx/commit/ab502e30ea17a59bfe49c5b6c61ba5514c28f7a4
        git remote add intel-tdx https://github.com/intel/tdx.git
        git fetch --no-tags intel-tdx guest-hardening-rebased
        git checkout ab502e30ea17a59bfe49c5b6c61ba5514c28f7a4
        # 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/

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

All warnings (new ones prefixed by >>):

>> arch/x86/coco/tdx/tdx.c:309:14: warning: no previous prototype for 'tdx_write_msr' [-Wmissing-prototypes]
     309 | void notrace tdx_write_msr(unsigned int msr, u32 low, u32 high)
         |              ^~~~~~~~~~~~~


vim +/tdx_write_msr +309 arch/x86/coco/tdx/tdx.c

   308	
 > 309	void notrace tdx_write_msr(unsigned int msr, u32 low, u32 high)
   310	{
   311		struct tdx_hypercall_args args = {
   312			.r10 = TDX_HYPERCALL_STANDARD,
   313			.r11 = hcall_func(EXIT_REASON_MSR_WRITE),
   314			.r12 = msr,
   315			.r13 = (u64)high << 32 | low,
   316		};
   317	
   318		if (tdx_fast_tdcall_path_msr(msr))
   319			__tdx_hypercall(&args, 0);
   320		else
   321			native_write_msr(msr, low, high);
   322	}
   323	

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