reproduce (this is a W=1 build):
        # https://github.com/intel-lab-lkp/linux/commit/ff6cf05dbbb8d27bf0e53e860d6320dd75ab8f78
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review T-J-Mercier/bpf-htab-Split-htab_elem_lru-and-htab_elem_pcpu-off-of-htab_elem/20261002-091734
        git checkout ff6cf05dbbb8d27bf0e53e860d6320dd75ab8f78

        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=$HOME/0day COMPILER=gcc-8.5.0 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=sparc olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-8.5.0 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=sparc SHELL=/bin/bash kernel/bpf/