reproduce (this is a W=1 build):
        git remote add awilliam-vfio https://github.com/awilliam/linux-vfio.git
        git fetch awilliam-vfio next
        git checkout awilliam-vfio/next
        b4 shazam https://lore.kernel.org/r/20251117124159.3560-4-ankita@nvidia.com

        git clone https://github.com/intel/lkp-tests.git ~/lkp-tests

        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-15.1.0 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=sparc olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-15.1.0 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=sparc SHELL=/bin/bash drivers/vfio/pci/nvgrace-gpu/