> So we want to change the definition of ZONE_DMA to refer to the first 16MB
> only? ZONE_DMA32 is always a 4GB border? (Andy disagrees about DMA32 see
> his message!).
Hmm? I didn't write anything about DMA32. Just noted a minor comment thinko about
highmem.
> It seems to me that DMA can be run on ZONE_NORMAL. ZONE_DMAxx is used for
> situations in which DMA cannot be done to all of memory. ZONE_DMA allows
> an architecture to define a single exception zone that ends at
> MAX_DMA_ADDRESS (which is arch specific).
It's really architecture dependent. The portable interfaces are
dma_alloc_* and suitable device masks and the architecture should sort
out then what zone to use.
I would say nearly everybody who uses GFP_DMA directly outside
{arch,asm}/* is wrong.
-Andi
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