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    SubjectRe: [PATCH 0/9] x86-64 put current in r10
    On Tue, Nov 29, 2005 at 11:21:18PM -0500, Benjamin LaHaise wrote:
    > Date: Tue, 29 Nov 2005 23:21:18 -0500
    > From: Benjamin LaHaise <>
    > To: Andi Kleen <>
    > Cc:
    > Subject: [PATCH 0/9] x86-64 put current in r10
    > Hello Andi,
    > The following emails contain the patches to convert x86-64 to store current
    > in r10 (also at This
    > provides a significant amount of code savings (~43KB) over the current
    > use of the per cpu data area. I also tested using r15, but that generated
    > code that was larger than that generated with r10. This code seems to be
    > working well for me now (it stands up to 32 and 64 bit processes and ptrace
    > users) and would be a good candidate for further exposure.

    I would rather prefer NOT to introduce this at this time.
    My primary concern is that during "even numbered series" there
    should not be radical internal ABI/API changes, like this one.

    In 2.7 it can be introduced, by all means.

    Indeed at the moment my thinking is, that X86-64 is way more UNSTABLE,
    than it should be. (And Linux kernel overall, but that is another story.)

    > -ben

    /Matti Aarnio
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