[Linaro-mm-sig] [RFC] ARM DMA mapping TODO, v1
arnd at arndb.de
Fri Apr 29 11:21:16 UTC 2011
On Friday 29 April 2011, Benjamin Herrenschmidt wrote:
> > However, dma_alloc_coherent() memory can't be used with the dma_sync_*
> > API as its return address (unlike other architectures) is not in the
> > kernel direct mapped memory range.
> Well, on non-coherent architectures, dma_sync_* are cache flushes, I
> don't see the point of doing those on a non-cachable mapping anyways.
The point was that you cannot do
#define dma_alloc_coherent dma_alloc_noncoherent
on ARM, as some other architectures do.
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