reproduce:
        # https://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git/commit/?id=efd5bd3144b76ff6eab5443d16df9797d9d7f4cd
        git remote add peterz-queue https://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git
        git fetch --no-tags peterz-queue sched/urgent
        git checkout efd5bd3144b76ff6eab5443d16df9797d9d7f4cd
        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