make the non-consistent DMA allocator more userful (resend)

[sorry for the spam, had to resend due a wrongly typed linux-arm-kernel address] Hi all, we had all kinds of discussions about how to best allocate DMAable memory without having to deal with the problem that your normal "coherent" DMA allocator can be very slow on platforms where DMA is not DMA

make the non-consistent DMA allocator more userful

Hi all, we had all kinds of discussions about how to best allocate DMAable memory without having to deal with the problem that your normal "coherent" DMA allocator can be very slow on platforms where DMA is not DMA coherent. To work around this drivers basically two choices at the moment: (1) j