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    SubjectRe: [RFC 0/8] Reduce MAX_NR_ZONES and remove useless zones.
    On Mon, 3 Jul 2006, Christoph Hellwig wrote:

    > On Mon, Jul 03, 2006 at 02:55:34PM -0700, Christoph Lameter wrote:
    > > I keep seeing zones on various platforms that are never used and wonder
    > > why we compile support for them into the kernel.
    > >
    > > IA64 on SGI for example only uses ZONE_DMA other IA64 platforms can
    > > also use ZONE_NORMAL.
    >
    > Which btw is utterly wrong. It should have a 4GB ZONE_DMA32 and everything
    > else in ZONE_NORMAL.

    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!).

    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).

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