tree:   https://github.com/intel/tdx.git guest
head:   c748712bd17bbd7f8a75553911a5557f3d7d32b2
commit: 2ea8a5cdb921187dea2d10db2aa5ad47d6e6ac03 [100/127] x86/tdx: Use direct paravirt call for wrmsrl
config: x86_64-allyesconfig (attached as .config)
compiler: gcc-9 (Debian 9.3.0-22) 9.3.0
reproduce (this is a W=1 build):
        # https://github.com/intel/tdx/commit/2ea8a5cdb921187dea2d10db2aa5ad47d6e6ac03
        git remote add intel-tdx https://github.com/intel/tdx.git
        git fetch --no-tags intel-tdx guest
        git checkout 2ea8a5cdb921187dea2d10db2aa5ad47d6e6ac03
        # save the attached .config to linux build tree
        make W=1 ARCH=x86_64 

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

All warnings (new ones prefixed by >>):

   arch/x86/kernel/tdx.c:256:5: warning: no previous prototype for 'tdx_hcall_set_notify_intr' [-Wmissing-prototypes]
     256 | int tdx_hcall_set_notify_intr(u8 vector)
         |     ^~~~~~~~~~~~~~~~~~~~~~~~~
>> arch/x86/kernel/tdx.c:427:14: warning: no previous prototype for 'tdx_write_msr' [-Wmissing-prototypes]
     427 | void notrace tdx_write_msr(unsigned int msr, u32 low, u32 high)
         |              ^~~~~~~~~~~~~


vim +/tdx_write_msr +427 arch/x86/kernel/tdx.c

   426	
 > 427	void notrace tdx_write_msr(unsigned int msr, u32 low, u32 high)
   428	{
   429		if (tdx_is_context_switched_msr(msr))
   430			native_write_msr(msr, low, high);
   431		else
   432			tdx_write_msr_safe(msr, low, high);
   433	}
   434	

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