reproduce (this is a W=1 build):
        git remote add jcmvbkbc-xtensa https://github.com/jcmvbkbc/linux-xtensa
        git fetch jcmvbkbc-xtensa xtensa-for-next
        git checkout jcmvbkbc-xtensa/xtensa-for-next
        b4 shazam https://lore.kernel.org/r/20260417074226.9295-1-pengpeng@iscas.ac.cn

        git clone https://github.com/intel/lkp-tests.git ~/lkp-tests

        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-15.2.0 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=xtensa olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-15.2.0 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=xtensa SHELL=/bin/bash arch/xtensa/platforms/iss/