reproduce:
        # https://git.kernel.org/pub/scm/linux/kernel/git/tj/sched_ext.git/commit/?id=6fb3113c1be677723097094830f8600b49a5afc7
        git remote add tj-sched-ext https://git.kernel.org/pub/scm/linux/kernel/git/tj/sched_ext.git
        git fetch --no-tags tj-sched-ext scx-api-rename-dispatch-v2
        git checkout 6fb3113c1be677723097094830f8600b49a5afc7
        make W=1 O=/tmp/kselftest headers
        make W=1 O=/tmp/kselftest -C tools/testing/selftests
        make W=1 O=/tmp/kselftest -C tools/testing/selftests/bpf