reproduce (this is a W=1 build):
        # https://git.kernel.org/pub/scm/linux/kernel/git/sashal/linux-next.git/commit/?id=f2303ad1d9c408ff9b4ab33d2cd68cdd454f4bdf
        git remote add sashal-next https://git.kernel.org/pub/scm/linux/kernel/git/sashal/linux-next.git
        git fetch --no-tags sashal-next arch-next
        git checkout f2303ad1d9c408ff9b4ab33d2cd68cdd454f4bdf

        git clone https://github.com/intel/lkp-tests.git ~/lkp-tests
        # apt-get install llvm-dev

        # save the config file
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-14.2.0 ~/lkp-tests/kbuild/make.cross W=1 ARCH=arm64 olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-14.2.0 ~/lkp-tests/kbuild/make.cross W=1 ARCH=arm64 
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-14.2.0 ~/lkp-tests/kbuild/make.cross W=1 headers_install
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-14.2.0 ~/lkp-tests/kbuild/make.cross W=1 -C tools/testing/selftests