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    SubjectRe: [RFC PATCH] ARM: smp: Fix the CPU hotplug race with scheduler.
    On 6/20/2011 8:31 PM, Russell King - ARM Linux wrote:
    > On Mon, Jun 20, 2011 at 08:24:33PM +0530, Santosh Shilimkar wrote:
    >> I am away from my board now. Will test this change.
    >> btw, the online-active race is still open even with this patch close
    >> and should be fixed.
    > I have yet to see any evidence of that race - I've been running your
    > test loop for about an hour so far on Versatile Express and nothing
    > yet.
    In that case my script was just exposing the calibrate() code race

    > That's not to say that we shouldn't wait for the active mask to become
    > true before calling schedule(), but I don't think its as big a deal as
    > you're suggesting it is.
    I am not expert to really trigger that exact race online-to-active but
    am sure the race needs to be fixed.

    May be Thomas can suggest a test-case to expose that race. From
    his fix for x86, it appeared that the race was indeed hit in some


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