[intel-tdx:guest-hardening-rebased 16/23] arch/x86/coco/tdx/tdx.c:531:15: warning: no previous prototype for 'tdx_mmio_readq'

[kernel test robot]

tree:   https://github.com/intel/tdx.git guest-hardening-rebased
head:   64a4c4e66ca9cce1ca55de6d801f32284fbf7c8e
commit: c3f81ff747739c9ee19408582ca418926af27188 [16/23] x86/tdx: Enable direct iomap MMIO optimizations
config: x86_64-allyesconfig (https://download.01.org/0day-ci/archive/20220708/202207080821.NvvSrMbA-lkp@xxxxxxxxx/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/c3f81ff747739c9ee19408582ca418926af27188
        git remote add intel-tdx https://github.com/intel/tdx.git
        git fetch --no-tags intel-tdx guest-hardening-rebased
        git checkout c3f81ff747739c9ee19408582ca418926af27188
        # 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@xxxxxxxxx>

All warnings (new ones prefixed by >>):

   arch/x86/coco/tdx/tdx.c:298:14: warning: no previous prototype for 'tdx_write_msr' [-Wmissing-prototypes]
     298 | void notrace tdx_write_msr(unsigned int msr, u32 low, u32 high)
         |              ^~~~~~~~~~~~~
>> arch/x86/coco/tdx/tdx.c:531:15: warning: no previous prototype for 'tdx_mmio_readq' [-Wmissing-prototypes]
     531 | unsigned long tdx_mmio_readq(void __iomem* addr)
         |               ^~~~~~~~~~~~~~


vim +/tdx_mmio_readq +531 arch/x86/coco/tdx/tdx.c

   530	
 > 531	unsigned long tdx_mmio_readq(void __iomem* addr)
   532	{
   533		unsigned long val;
   534	
   535		if (tdx_virt_mmio(8, false, (unsigned long)addr, &val))
   536			return 0xffffffffffffffff;
   537		return val;
   538	}
   539	

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