Messages in this thread | | | Date | Fri, 5 Jan 2007 15:42:46 +0300 | From | Oleg Nesterov <> | Subject | Re: [PATCH, RFC] reimplement flush_workqueue() |
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On 01/05, Srivatsa Vaddagiri wrote: > > On Thu, Jan 04, 2007 at 09:18:50AM -0800, Andrew Morton wrote: > > This? > > This can still lead to the problem spotted by Oleg here: > > http://lkml.org/lkml/2006/12/30/37 > > and you would need a similar patch he posted there.
preempt_disable() can't prevent cpu_up, but flush_workqueue() doesn't care _unless_ cpu_down also happened meantime (and hence a fresh CPU may have pending work_structs which were moved from a dead CPU).
So you are right, we still need the patch above, but I think we don't have new problems with preempt_disable().
I might have missed your point though.
Oleg.
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