[PATCH] dma-mapping: treat dev->bus_dma_mask as a DMA limit

[Christoph Hellwig]

On Tue, Nov 19, 2019 at 01:57:43PM +0100, Nicolas Saenz Julienne wrote:
> Hi Rob & Christoph,
> do you mind if I append v2 of this into my upcoming v3 RPi4 PCIe support
> series, I didn't do it initially as I thought this was going to be a
> contentious patch.  But as it turned out better than expected, I think it
> should go into the PCIe series. In the end it's the first explicit user of the
> bus DMA limit.
> 
> Here's v2 in case you don't know what I'm talking about:
> https://www.spinics.net/lists/arm-kernel/msg768459.html

In principle I wouldn't mind, but I think this is going to conflict
quite badly with other changes in the dma-mapping tree (including
yours).  So I think we'll need a shared tree or I'll need to pull
in the whole series through the dma-mapping tree if there are not
other conflicts and the other maintainers are fine with it.