Re: [PATCH 7/9] afs: don't use PREPARE_WORK

From: Tejun Heo
Date: Thu Feb 20 2014 - 17:46:47 EST


On Thu, Feb 20, 2014 at 10:00:05PM +0000, David Howells wrote:
> Tejun Heo <tj@xxxxxxxxxx> wrote:
>
> > PREPARE_[DELAYED_]WORK() are being phased out. They have few users
> > and a nasty surprise in terms of reentrancy guarantee as workqueue
> > considers work items to be different if they don't have the same work
> > function.
>
> Why so? Isn't the work item address sufficient to distinguish them?

Because we ended up introducing deadlocks through work items which are
freed and then recycled.

Thanks.

--
tejun
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