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    SubjectRe: [PATCH 04/40] sched: implement __set_cpus_allowed()
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    On Tue, 2010-01-19 at 10:07 +0900, Tejun Heo wrote:
    >
    > It's also necessary to guarantee forward progress during CPU_DOWN.
    > The problem with kthread_bind() is that it's not synchronized against
    > CPU hotplug operations. It needs outer synchronization like calling
    > it directly from CPU_DOWN_PREP. I guess it's doable but I think it
    > would be better to simply share the backend implementation between
    > set_cpus_allowed_ptr() and kthread_bind().

    OK, so you're saying you need to migrate the rescue thread during
    cpu-down. That thread is guaranteed sleeping right, if it were not it'd
    not be elegible to run on our dying cpu. Hence kthread_bind() ought to
    just work, no?



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