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    SubjectRe: [BISECTION RESULT] sched: revert cpu_clock to pre-27ec4407790d075c325e1f4da0a19c56953cce23 state
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    From: "Luck, Tony" <tony.luck@intel.com>
    Date: Mon, 4 Aug 2008 15:00:47 -0700

    > > I'd bet resonable sums of money that we are (once again) accessing
    > > per-cpu variables in code before ia64 has a chance to initialize
    > > things so that they can actually work. :-(
    >
    > I tried this simple hack to check ... per-cpu variables are
    > not usable until cpu_init() sets up the "ar.k3" register on
    > ia64. So this hack checks to see if it is set before calling
    > cpu_clock():

    Can you guys on IA64 possibly set ar.k3 simply to zero or to some
    other similar value which cancels out the per-cpu computation?

    That's what sparc64 and other platforms do.


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