reproduce (this is a W=1 build):
        git clone https://github.com/intel/lkp-tests.git ~/lkp-tests
        git remote add dennis-percpu https://git.kernel.org/pub/scm/linux/kernel/git/dennis/percpu.git
        git fetch dennis-percpu for-next
        git checkout dennis-percpu/for-next
        b4 shazam https://lore.kernel.org/r/20240903102342.36957-1-ubizjak@gmail.com
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-13.3.0 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=loongarch olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-13.3.0 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=loongarch prepare