Re: [RFC][PATCH 2/7] kref: Add kref_read()

[Peter Zijlstra]

On Mon, Nov 21, 2016 at 04:49:15PM +0100, Peter Zijlstra wrote:
> > Speaking of non-fitting patterns. This one is quite common in
> > networking code for refcounters:
> > 
> > if (atomic_cmpxchg(&cur->refcnt, 1, 0) == 1) {} This is from
> > net/netfilter/nfnetlink_acct.c, but there are similar ones in other
> > places.
> 
> Cute, but weird it doesn't actually decrement if not 1.

Hurgh.. creative refcounting that. The question is how much of that do
we want to support? It really must not decrement there.