[intel-tdx:guest 62/136] arch/x86/kernel/tdx.c:225:5: warning: no previous prototype for function 'tdx_hcall_set_notify_intr'

[kernel test robot <lkp@intel.com>]

tree:   https://github.com/intel/tdx.git guest
head:   f3d7a7e86bf2f0d5ce629f2fb7be11dca88ac06d
commit: 2c0498d3a27b537d428cc081fe9578605111569e [62/136] x86/tdx: Add SetupEventNotifyInterrupt TDX hypercall support
config: x86_64-allyesconfig (https://download.01.org/0day-ci/archive/20231217/202312170253.LKpNFmoD-lkp@intel.com/config)
compiler: clang version 16.0.4 (https://github.com/llvm/llvm-project.git ae42196bc493ffe877a7e3dff8be32035dea4d07)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20231217/202312170253.LKpNFmoD-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202312170253.LKpNFmoD-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> arch/x86/kernel/tdx.c:225:5: warning: no previous prototype for function 'tdx_hcall_set_notify_intr' [-Wmissing-prototypes]
   int tdx_hcall_set_notify_intr(u8 vector)
       ^
   arch/x86/kernel/tdx.c:225:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   int tdx_hcall_set_notify_intr(u8 vector)
   ^
   static 
   1 warning generated.


vim +/tdx_hcall_set_notify_intr +225 arch/x86/kernel/tdx.c

   217	
   218	/*
   219	 * tdx_hcall_set_notify_intr() - Setup Event Notify Interrupt Vector.
   220	 *
   221	 * @vector        : Vector address to be used for notification.
   222	 *
   223	 * return 0 on success or failure error number.
   224	 */
 > 225	int tdx_hcall_set_notify_intr(u8 vector)
   226	{
   227		u64 ret;
   228	
   229		/* Minimum vector value allowed is 32 */
   230		if (vector < 32)
   231			return -EINVAL;
   232	
   233		/*
   234		 * Register callback vector address with VMM. More details
   235		 * about the ABI can be found in TDX Guest-Host-Communication
   236		 * Interface (GHCI), sec 3.5.
   237		 */
   238		ret = _trace_tdx_hypercall(TDVMCALL_SETUP_NOTIFY_INTR, vector, 0, 0, 0,
   239					   NULL);
   240	
   241		if (ret == TDVMCALL_SUCCESS)
   242			return 0;
   243		else if (ret == TDCALL_INVALID_OPERAND)
   244			return -EINVAL;
   245	
   246		return -EIO;
   247	}
   248	

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