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    SubjectRe: [PATCH 08/20 -v5] initialize the clock source to jiffies clock.
    Steven Rostedt wrote:
    > The latency tracer can call clocksource_read very early in bootup and
    > before the clock source variable has been initialized. This results in a
    > crash at boot up (even before earlyprintk is initialized). Since the
    > clock->read variable points to NULL.
    > This patch simply initializes the clock to use clocksource_jiffies, so
    > that any early user of clocksource_read will not crash.

    There's a similar problem with reads of sched_clock() too early
    on some architectures. This problem reminds me of a fix I need
    to re-send to the ARM mailing list. That aside, I heartily recommend
    applying this patch, whether the rest of this system gets mainlined
    or not.

    Acked-by: Tim Bird <>

    -- Tim

    Tim Bird
    Architecture Group Chair, CE Linux Forum
    Senior Staff Engineer, Sony Corporation of America

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