[intel-tdx:guest 2/4] arch/x86/kernel/tdx-tests.c:66:12: sparse: sparse: symbol 'kvm_unit_test_debug_init' was not declared. Should it be static?

[kernel test robot]

tree:   https://github.com/intel/tdx.git guest
head:   f3d7a7e86bf2f0d5ce629f2fb7be11dca88ac06d
commit: 4cd6be90a565d847e1d7ccfe28264a1610a02a34 [2/4] x86/tdx-tests: Add a port of a kvm unit test
config: x86_64-allyesconfig (https://download.01.org/0day-ci/archive/20220804/202208040410.dDBmxB5X-lkp@xxxxxxxxx/config)
compiler: gcc-11 (Debian 11.3.0-3) 11.3.0
reproduce:
        # apt-get install sparse
        # sparse version: v0.6.4-39-gce1a6720-dirty
        # https://github.com/intel/tdx/commit/4cd6be90a565d847e1d7ccfe28264a1610a02a34
        git remote add intel-tdx https://github.com/intel/tdx.git
        git fetch --no-tags intel-tdx guest
        git checkout 4cd6be90a565d847e1d7ccfe28264a1610a02a34
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=x86_64 SHELL=/bin/bash arch/x86/kernel/ lib/

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

sparse warnings: (new ones prefixed by >>)
>> arch/x86/kernel/tdx-tests.c:66:12: sparse: sparse: symbol 'kvm_unit_test_debug_init' was not declared. Should it be static?

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