Re: [RFC][PATCH 7/7] kref: Implement using refcount_t

From: Will Deacon
Date: Thu Nov 17 2016 - 12:02:28 EST

On Thu, Nov 17, 2016 at 05:11:10PM +0100, Peter Zijlstra wrote:
> On Thu, Nov 17, 2016 at 12:08:36PM +0000, Will Deacon wrote:
> > All sounds reasonable to me. It's worth pointing out that you can't create
> > order using a control dependency hanging off the status flag of a
> > store-conditional, but the code in question here has the dependency from
> > the loaded value, which is sufficient.
> Yeah, I'm always surprised by that 'feature'. Is that ARM specific? Or
> so more LL/SC archs have this?

In general, I'm not sure, but I think PPC does allow for the control