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    SubjectRe: [PATCh] x86: overmapped fix when 4K pages on tail - 64bit
    On Sun, 13 Jul 2008 16:57:50 +0200
    Andi Kleen <andi@firstfloor.org> wrote:

    > Arjan van de Ven <arjan@infradead.org> writes:
    >
    > > On Wed, 9 Jul 2008 20:15:02 -0700
    > > Yinghai Lu <yhlu.kernel@gmail.com> wrote:
    > >
    > >>
    > >>
    > >> fix phys_pmd_init to make sure not to return big value than end.
    > >>
    > >> also print out range split:1G/2M/4K
    > >>
    > >> Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com>
    > >
    > >
    > > Making an accurate mapping solves a lot of potentially nasty/tricky
    > > corner cases, so I like the approach
    >
    > It also means that e.g. on a 1GB system the direct mapping will
    > never use 1GB pages.
    >
    > And the CPU has to handle this anyways because all the old
    > kernels overmap and no x86 CPU can drop support for all old
    > kernels.

    for the 2mb case.. please find me a dimm which isn't a multiple of
    2Mb ;-)



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