vsock_stream_has_space
s64 vsock_stream_has_space(struct vsock_sock *vsk);
EXPORT_SYMBOL_GPL(vsock_stream_has_space);
while (vsock_stream_has_space(vsk) == 0 &&
free_space = vsock_stream_has_space(vsk);
produce_q_free_space = vsock_stream_has_space(vsk);
produce_q_free_space = vsock_stream_has_space(vsk);