Re: lockdep trace from posix timers

[Peter Zijlstra]

On Mon, 2012-08-20 at 17:32 +0200, Oleg Nesterov wrote:

> > I guess we could steal the entire list and requeue it afterwards and
> > lift TIF_NOTIFY_RESUME along with it..
> 
> We can't. This can race with exit_task_work(). And this can break
> fput(), the task can return to the userspace without __fput().

So we could put that spinlock back around cancel and run and leave add
lockless. That'd solve my immediate problem but its not something I'm
proud of.

All schemes I can come up with end up being broken or effectively the
same as the above proposal.
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