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Date: Wed, 10 Jan 2018 16:55:46 +0100
From: Christoph Hellwig <hch@lst.de>
To: Robin Murphy <robin.murphy@arm.com>
Cc: Christoph Hellwig <hch@lst.de>, iommu@lists.linux-foundation.org,
        linux-arch@vger.kernel.org, linux-mips@linux-mips.org,
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Subject: Re: [PATCH 21/22] arm64: replace ZONE_DMA with ZONE_DMA32
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On Wed, Jan 10, 2018 at 04:55:17PM +0100, Christoph Hellwig wrote:
> On Wed, Jan 10, 2018 at 12:58:14PM +0000, Robin Murphy wrote:
> > On 10/01/18 08:09, Christoph Hellwig wrote:
> >> arm64 uses ZONE_DMA for allocations below 32-bits.  These days we
> >> name the zone for that ZONE_DMA32, which will allow to use the
> >> dma-direct and generic swiotlb code as-is, so rename it.
> >
> > I do wonder if we could also "upgrade" GFP_DMA to GFP_DMA32 somehow when 
> > !ZONE_DMA - there are almost certainly arm64 drivers out there using a 
> > combination of GFP_DMA and streaming mappings which will no longer get the 
> > guaranteed 32-bit addresses they expect after this. I'm not sure quite how 
> > feasible that is, though :/
> 
> I can't find anything obvious in the tree. The alternative would be
> to keep ZONE_DMA and set ARCH_ZONE_DMA_BITS.
> 
> > That said, I do agree that this is an appropriate change (the legacy of 
> > GFP_DMA is obviously horrible), so, provided we get plenty of time to find 
> > and fix the fallout when it lands:
> >
> > Reviewed-by: Robin Murphy <robin.murphy@arm.com>
> 
> I was hoping to get this into 4.15.  What would be proper time to
> fix the fallout?

Err, 4.16 of course.