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    SubjectRe: [RFC patch 08/18] cnt32_to_63 should use smp_rmb()
    Date
    Andrew Morton <akpm@linux-foundation.org> wrote:

    > I mean, the darned thing is called from sched_clock(), which can be
    > concurrently called on separate CPUs and which can be called from
    > interrupt context (with an arbitrary nesting level!) while it was running
    > in process context.
    >
    > Who let that thing into Linux?

    Having crawled all over it, and argued with Nicolas and Panasonic about it, I
    think it's safe in sched_clock(), provided sched_clock() never gets preempted -
    which appears to be the case.

    David


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