Re: [PATCHv7 3/3] vhost_net: a kernel-level virtio server

From: Paul E. McKenney
Date: Fri Nov 06 2009 - 11:30:24 EST

On Fri, Nov 06, 2009 at 03:31:20PM +1030, Rusty Russell wrote:
> On Thu, 5 Nov 2009 03:55:42 am Paul E. McKenney wrote:
> > On Wed, Nov 04, 2009 at 01:57:29PM +0200, Michael S. Tsirkin wrote:
> > > Can you ack this usage please?
> >
> > I thought I had done so in my paragraph above, but if you would like
> > something a bit more formal...
> <snip verbose super-ack with qualifications>
> That's great guys. And yes, this is a kind of read-copy-update. And no,
> there's nothing wrong with it.
> But it's still nasty to use half an API. If it were a few places I would
> have open-coded it with a comment, or wrapped it. As it is, I don't think
> that would be a win.

So would it help to have a rcu_read_lock_workqueue() and
rcu_read_unlock_workqueue() that checked nesting and whether they were
actually running in the context of a workqueue item? Or did you have
something else in mind? Or am I misjudging the level of sarcasm in
your reply? ;-)

Thanx, Paul
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