reproduce (this is a W=1 build):
        # https://github.com/intel-lab-lkp/linux/commit/63cfc63d64c81b04d163214896204034c88aa688
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Karunika-Choo/drm-panthor-Ignore-EOPNOTSUPP-for-shader-present-nvmem-lookup/20260922-214455
        git checkout 63cfc63d64c81b04d163214896204034c88aa688

        git clone https://github.com/intel/lkp-tests.git ~/lkp-tests
        # apt-get install sparse
        # sparse: v0.6.5-rc1

        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.5.0 ~/lkp-tests/kbuild/make.cross W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__ -fmax-errors=unlimited -fmax-warnings=unlimited' O=build_dir ARCH=sparc64 olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.5.0 ~/lkp-tests/kbuild/make.cross W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__ -fmax-errors=unlimited -fmax-warnings=unlimited' O=build_dir ARCH=sparc64 SHELL=/bin/bash drivers/gpu/drm/panthor/arbitration/