reproduce (this is a W=1 build):
        git checkout 5128b972fb2801ad9aca54d990a75611ab5283a9
        b4 shazam https://lore.kernel.org/r/e9d6845e7727f297bd702f5a05c8006f88fc7e8f.1772732517.git.isaku.yamahata@intel.com
        # apt-get install sparse
        # sparse: v0.6.5-rc1

        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__ -fmax-errors=unlimited -fmax-warnings=unlimited' O=build_dir ARCH=i386 olddefconfig
        make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__ -fmax-errors=unlimited -fmax-warnings=unlimited' O=build_dir ARCH=i386 SHELL=/bin/bash arch/x86/kvm/