Re: [Linaro-mm-sig] [PATCH 4/4] ARM: remove consistent dma region and use common vmalloc range for dma allocations

On Fri, Apr 13, 2012 at 04:05:50PM +0200, Marek Szyprowski wrote:

This patch changes dma-mapping subsystem to use generic vmalloc areas for all consistent dma allocations. This increases the total size limit of the consistent allocations and removes platform hacks and a lot of duplicated code.

NAK. I don't think you appreciate the contexts from which the dma coherent code can be called from, and the reason why we pre-allocate the page tables (so that IRQ-based allocations work.)

The vmalloc region doesn't allow that because page tables are allocated using GFP_KERNEL not GFP_ATOMIC.

Sorry.