On Wed, Dec 05, 2018 at 06:43:08AM -0800, Christoph Hellwig wrote:

On Wed, Dec 05, 2018 at 02:40:06PM +0000, Robin Murphy wrote:

quoted

32-bit Arm doesn't have ZONE_DMA32, but has (or at least had at the time) a
2GB ZONE_DMA. Whether we actually need that or not depends on how this all
interacts with LPAE and highmem, but I'm not sure of those details off-hand.

Well, arm32 can't address more than 32-bits in the linear kernel
mapping, so GFP_KERNEL should be perfectly fine there if the limit
really is 32-bits and not 31 or smaller because someone stole a bit
or two somewhere.

I'm not sure that's necessarily true on the physical side. Wasn't there a
keystone SoC with /all/ the coherent memory above 4GB?

Will

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