Re: [PATCH v4 3/3] iommu/io-pgtable-arm-v7s: Request DMA32 memory, and improve debugging
From: Christoph Hellwig <hch@infradead.org>
Date: 2018-12-05 14:43:23
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linux-iommu, linux-mm, lkml
On Wed, Dec 05, 2018 at 02:40:06PM +0000, Robin Murphy wrote:
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. _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel