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    SubjectRe: [patch 5/7] x86_64: Support for cpu ops

    * Christoph Lameter <cl@linux-foundation.org> wrote:

    > +#
    > +# X86_64's spare segment register points to the PDA instead of the per
    > +# cpu area. Therefore x86_64 is not able to generate atomic vs. interrupt
    > +# per cpu instructions.
    > +#
    > +config HAVE_CPU_OPS
    > + def_bool y
    > + depends on X86_32
    > +

    hm, what happened to the rebase-PDA-to-percpu-area optimization
    patches you guys were working on? I remember there was some binutils
    flakiness - weird crashes and things like that. Did you ever manage to
    stabilize it? It would be sad if only 32-bit could take advantage of
    the optimized ops.

    Ingo


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