Re: [Linaro-mm-sig] [PATCH 2/8] ARM: dma-mapping: implement dma_map_single on top of dma_map_page

On Monday 20 June 2011, Marek Szyprowski wrote:

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This also breaks dmabounce when used with a highmem-enabled system - dmabounce refuses the dma_map_page() API but allows the dma_map_single() API.

I really not sure how this change will break dma bounce code.

Does it mean that it is allowed to call dma_map_single() on kmapped HIGH_MEM page?

dma_map_single on a kmapped page already doesn't work, the argument needs to be inside of the linear mapping in order for virt_to_page to work.

Arnd