dma_resv_copy_fences
EXPORT_SYMBOL(dma_resv_copy_fences);
r = dma_resv_copy_fences(&bo->base._resv, bo->base.resv);
ret = dma_resv_copy_fences(&ghost->base._resv, bo->base.resv);
int dma_resv_copy_fences(struct dma_resv *dst, struct dma_resv *src);