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    SubjectRe: 2.4 MM overview?
    On Sun, Oct 15, 2000 at 06:03:40PM +0200, Erik Mouw wrote:
    > On Sun, Oct 15, 2000 at 04:24:45PM +0100, Kenn Humborg wrote:
    > > I understand that 2.4 no longer maps all physical memory as 2.2
    > > and earlier used to do.
    > >
    > > Is there any documentation on this change and how it affects
    > > arch-specific code?
    > >
    > > Specifically, we've been basing the VAX port on 2.2 while waiting
    > > for 2.4 to stabilize. Now we're looking at moving to 2.4.
    > Have a look at the Linux-MM pages at:

    The stuff linked to from there seems to cover the higher-level VM
    aspects like balancing the VM. Basically arch-independent stuff.

    I'm looking for info on the impact the 2.4 changes will have on the
    "API" between the arch-indep and arch-dep code. For example, 2.2
    assumes that you can access <phys-addr> by referencing
    <phys-addr> + PAGE_OFFSET. AFAIK, this is no longer true in 2.4.

    So what's the new mechanism for accessing physical memory?

    OK, this particular question is easily answered by reading the


    __pa() and __va() are still defined as addr -/+ PAGE_OFFSET. So
    where did I hear about 2.4 not mapping all memory? Could it be
    that this applies only to "high memory" in x86?

    Dazed and confused,

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