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    SubjectRe: [BUG] "sched: Remove rq->lock from the first half of ttwu()" locks up on ARM
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    On Thu, 2011-05-26 at 18:09 +0200, Peter Zijlstra wrote:
    > On Thu, 2011-05-26 at 17:59 +0200, Peter Zijlstra wrote:
    > > On Thu, 2011-05-26 at 17:45 +0200, Oleg Nesterov wrote:
    > > > Stupid question. Can't we fix this problem if we do
    > > >
    > > > - if (p == current)
    > > > + if (cpu == raw_smp_processor_id())
    > > >
    > > > ?
    > > >
    > > > I forgot the rules... but iirc task_cpu(p) can't be changed under us?
    > >
    > > Easy enough to test.. brain gave out again,. hold on ;-)
    >
    > The below seems to run all-right so far, I'll let it run for a while.

    Doesn't look very good here. The serial console basically locks up as
    soon as the system gets busy, even if the kernel compilation seem to
    progress at a decent pace.

    M.

    --
    Reality is an implementation detail.




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