Re: [PATCH, RFC] reimplement flush_workqueue()

[Oleg Nesterov]

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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