dma_fence_signal
r = dma_fence_signal(fence);
dma_fence_signal(e->fence);
dma_fence_signal(&fence->base);
dma_fence_signal(&clflush->dma);
dma_fence_signal(&rq->fence);
int dma_fence_signal(struct dma_fence *fence);
dma_fence_signal(fence);
dma_fence_signal(&array->base);
ret = dma_fence_signal(&fence->base);
r_sig = dma_fence_signal(&fence->base);
int ret = dma_fence_signal(&fence->scheduled);
int ret = dma_fence_signal(&fence->finished);