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    SubjectRe: [Xen-devel] Re: [patch 14/21] Xen-paravirt: Add XEN config options and disable unsupported config options.
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    On Fri, 2007-02-16 at 02:19 -0800, Zachary Amsden wrote:
    > Doesn't stop_machine_run already take care of getting you out of all
    > kernel threads? So you can only be sleeping, not preempted, in which
    > case, this might not be an issue?

    No, stop_machine only protects against preempt-disabled regions.

    I thought about making that particularly hammer bigger, but noone had
    needed it yet. It would simply require a runtime way of disabling
    further preemption and flushing preempted threads (AFAICT there can be
    no deadlock issues with this).

    Rusty.


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