I915_FENCE_FLAG_HOLD
clear_bit(I915_FENCE_FLAG_HOLD, &rq->fence.flags);
return unlikely(test_bit(I915_FENCE_FLAG_HOLD, &rq->fence.flags));
set_bit(I915_FENCE_FLAG_HOLD, &rq->fence.flags);
clear_bit(I915_FENCE_FLAG_HOLD, &rq->fence.flags);