reproduce (this is a W=1 build):
        git clone https://github.com/intel/lkp-tests.git ~/lkp-tests
        git remote add ulf-hansson-pm git://git.linaro.org/people/ulf.hansson/linux-pm.git
        git fetch --no-tags ulf-hansson-pm psci_s2idle_deep_v3
        git checkout 4aa4d00e19ea23ea87b524a423885e3bbee1a6d4
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-14.2.0 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=arm64 olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-14.2.0 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=arm64 SHELL=/bin/bash drivers/firmware/psci/