On Fri, 26 Jan 2007, Andrew Morton wrote:
> - They add zillions of ifdefs
They just add a few for ZONE_DMA where we alreaday have similar ifdefs for
ZONE_DMA32 and ZONE_HIGHMEM.
> - They make the VM's behaviour diverge between different platforms and
> between differen configs on the same platforms, and hence degrade
> maintainability and increase complexity.
They avoid unecessary complexity on platforms. They could be made to work
on more platforms with measures to deal with what ZONE_DMA
provides in different ways. There are 6 or so platforms that do not need
ZONE_DMA at all.
> - We kicked around some quite different ways of implementing the same
> things, but nothing came of it. iirc, one was to remove the hard-coded
> zones altogether and rework all the MM to operate in terms of
>
> for (idx = 0; idx < NUMBER_OF_ZONES; idx++)
> ...
Hmmm.. How would that be simpler?
> - I haven't seen any hard numbers to justify the change.
I have send you numbers showing significant reductions in code size.
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