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    SubjectRe: [PATCH] i386: single node SPARSEMEM fix
    On 9/8/05, Dave Hansen <> wrote:
    > On Wed, 2005-09-07 at 11:22 -0700, Martin J. Bligh wrote:
    > > CONFIG_NUMA was meant to (and did at one point) support both NUMA and flat
    > > machines. This is essential in order for the distros to support it - same
    > > will go for sparsemem.
    > That's a different issue. The current code works if you boot a NUMA=y
    > SPARSEMEM=y machine with a single node. The current Kconfig options
    > also enforce that SPARSEMEM depends on NUMA on i386.
    > Magnus would like to enable SPARSEMEM=y while CONFIG_NUMA=n. That
    > requires some Kconfig changes, as well as an extra memory present call.
    > I'm questioning why we need to do that when we could never do
    > DISCONTIG=y while NUMA=n on i386.

    Actually, I do not really care about the Kconfig stuff. I just added
    that to show you guys why and when the change in
    arch/i386/kernel/setup.c was needed. So my main interest is to include
    the fix to the single-node version of setup_memory(). This to sync up
    the single-node case with the multiple-node version of setup_memory(),
    and to make it easier for me and other people to start using sparsemem
    om single-node (or non-NUMA if you prefer that) configurations.

    / magnus
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