prepare_to_wait
prepare_to_wait(&intel_state->commit_ready.wait,
prepare_to_wait(&dev_priv->gpu_error.wait_queue,
prepare_to_wait(wq, &wait, TASK_UNINTERRUPTIBLE);
prepare_to_wait(&wq, &tmp_wq, state); \
void prepare_to_wait(wait_queue_head_t *q, wait_queue_entry_t *wait, int state);