Re: [PATCH v2] drm/xen-front: Make shmem backed display buffer coherent

From: Gerd Hoffmann
Date: Wed Jan 16 2019 - 01:30:06 EST


> + if (!dma_map_sg(dev->dev, xen_obj->sgt->sgl, xen_obj->sgt->nents,
> + ret = -EFAULT;
> + goto fail_free_sgt;
> + }

Hmm, so it seems the arm guys could not come up with a suggestion how to
solve that one in a better way. Ok, lets go with this then.

But didn't we agree that this deserves a comment exmplaining the purpose
of the dma_map_sg() call is to flush caches and that there is no actual
DMA happening here?