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    SubjectRe: fix BUG: using smp_processor_id() in touch_nmi_watchdog and touch_softlockup_watchdog
    On Mon, Aug 16, 2010 at 03:46:58PM +0200, Peter Zijlstra wrote:
    > > I don't see a problem with the patch, but my low level understanding of
    > > the __get_cpu_var vs. per_cpu isn't very strong.
    >
    > __get_cpu_var() gets you the value on the current cpu, per_cpu() takes a
    > cpu argument.

    Well I know that much. :-) It seems that __get_cpu_var depends on
    preemption being disabled whereas per_cpu does not? Though for some
    reason I thought __get_cpu_var would be more atomic when it grabbed the
    current cpu such that you wouldn't need to disable preemption. Guess not.

    Cheers,
    Don



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