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    SubjectRe: [rfc 08/45] cpu alloc: x86 support
    On Tue, 20 Nov 2007, Christoph Lameter wrote:

    > 32bit sign extension for what? Absolute data references? The addressing
    > that I have seen was IP relative. Thus I thought that the kernel could be
    > moved lower.

    Argh. This is all depending on a special gcc option to compile the
    kernel and that option limits the kernel to the upper 2GB. So I guess for
    CPU_PTR we need to explicitly load the address as a constant, use that as
    a base and then add the offset and the smp_id shifted to it in the
    instruction. The CPU_INC/DEC stuff using gs is not affected.


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