Messages in this thread | | | Subject | Re: PATCH: Fix race in cpu_down (hotplug cpu) | From | Nick Piggin <> | Date | Mon, 19 Sep 2005 16:36:23 +1000 |
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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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