Re: [PATCH vhost v7 01/11] virtio_ring: split: separate dma codes

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On Sun, 30 Apr 2023 21:24:52 -0700, Christoph Hellwig <hch@xxxxxxxxxxxxx> wrote:
> > +static dma_addr_t vring_sg_address(struct scatterlist *sg)
> > +{
> > +	if (sg->dma_address)
> > +		return sg->dma_address;
> 0 is a perfectly valid DMA address.  So I have no idea how this is
> even supposed to work.


I think I can change it here to judge based on sg_page(sg). If there is no page,
I assume this sg already has DMA Address.


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