reproduce (this is a W=1 build):
        git clone https://github.com/intel/lkp-tests.git ~/lkp-tests
        # https://git.kernel.org/pub/scm/linux/kernel/git/pinchartl/linux.git/commit/?id=73bdce8e3693eba9d97649d53eaff7592fd07a5f
        git remote add pinchartl https://git.kernel.org/pub/scm/linux/kernel/git/pinchartl/linux.git
        git fetch --no-tags pinchartl rpi/v6.8/unicam/next
        git checkout 73bdce8e3693eba9d97649d53eaff7592fd07a5f
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang-17 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=x86_64 olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang-17 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash drivers/staging/vc04_services/bcm2835-isp/