reproduce (this is a W=1 build):
        # https://github.com/intel-lab-lkp/linux/commit/edf653aa3964af51ae2f2b180bcb0f6cfa26c8f7
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Vernon-Yang/psi-add-psi_group_flush_stats-function/20260509-210713
        git checkout edf653aa3964af51ae2f2b180bcb0f6cfa26c8f7

        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=$HOME/0day COMPILER=clang-20 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=x86_64 olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang-20 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash kernel/bpf/