linux-kernel - Re: [PATCH] vdpa-sim: depend on HAS

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Date:   Mon, 6 Apr 2020 11:50:30 -0400
From:   "Michael S. Tsirkin" <mst@...hat.com>
To:     Jason Wang <jasowang@...hat.com>
Cc:     Christoph Hellwig <hch@...radead.org>,
        linux-kernel@...r.kernel.org,
        virtualization@...ts.linux-foundation.org
Subject: Re: [PATCH] vdpa-sim: depend on HAS_DMA

On Mon, Apr 06, 2020 at 10:12:56PM +0800, Jason Wang wrote:
> 
> On 2020/4/6 下午10:02, Michael S. Tsirkin wrote:
> > On Mon, Apr 06, 2020 at 06:09:27AM -0700, Christoph Hellwig wrote:
> > > Pleae just drop the code - we should not add new drivers with custom
> > > DMA ops.
> > I'm not sure there's another way to do this: this not a driver, it's a
> > software emulator that pretends to be an actual device. We can't
> > have the platform supply DMA ops here since the platform is a regular
> > x86 or whatever.
> 
> 
> Yes, actually vdpa-sim does not depends on HAS_DMA. Maybe we can do shortcut
> like dev->dma_ops = vdpasim_dma_ops;
> 
> Thanks
> 

We can do that - does it them actually work - and not just compile?

-- 
MST