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    SubjectRe: [patch 02/11] PAT x86: Map only usable memory in x86_64 identity map and kernel text


    On Thu, 10 Jan 2008, venkatesh.pallipadi@intel.com wrote:
    >
    > x86_64: Map only usable memory in identity map. All reserved memory maps to a
    > zero page.

    I don't mind this horribly per se, but why a zero page?

    Accessing that page without mapping it explicitly would be a bug with
    your change - if only because you'd get the wrong value!

    So why map it at all? The only thing mapping it can do is to hide bugs.

    Linus


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