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    SubjectRe: PATCH: Fix race in cpu_down (hotplug cpu)
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    On Mon, 2005-09-19 at 14:37 +0800, Shaohua Li wrote:
    > On Mon, 2005-09-19 at 11:53 +0530, Srivatsa Vaddagiri wrote:

    > > default_idle should be fine as it is. IOW it should not cause __cpu_die to
    > > timeout.
    > Why default_idle should be fine? it can be preempted before the
    > 'local_irq_disable' check. Even with Nigel's patch, there is a very
    > small window at safe_halt (after 'sti' but before 'hlt').
    >

    Ah, actually I have a patch which makes all CPU idle threads
    run with preempt disabled and only enable preempt when scheduling.
    Would that help?

    Nick

    --
    SUSE Labs, Novell Inc.



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