Re: [RFC 0/8] Reduce MAX_NR_ZONES and remove useless zones.

[Christoph Hellwig]

On Tue, Jul 04, 2006 at 01:47:10AM +0200, Andi Kleen wrote:
> 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.

Well, there's some cases where you don't want coherent mappings but
rather alloc_page + dma_map_*.  And having a ZONE_DMA32 that is valid
on all architectures is very valueable for that.

I remember James promised a kmalloc_mask a last Kernel Summit that would
many things easier, but even than having predictable memory zone layouts
overy different architectures is a win.
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