RE: [PATCH 14/15] futex: convert futex_pi_state.refcount to refcount_t

[Reshetova, Elena]

> On Fri, Sep 01, 2017 at 11:05:33AM +0000, Reshetova, Elena wrote:
> > Actually on the second thought: does the above memory ordering differences
> > really apply when  we have ARCH_HAS_REFCOUNT? To me it looks like the way
> > how it is currently implemented for x86 is the same way as it is for atomic cases.
> 
> Never look to x86 for memory ordering, its boring.
> 
> And yes, for the ARM implementation it can certainly make a difference.

So, yes, what I am trying to say is that it can really depend if you have ARCH_HAS_REFCOUNT
enabled or not and then also based on architecture. Thus I believe is also true for atomic: there
might be differences when you use arch. dependent version of function or not. 

So, I guess if I rewrite the commits, I should only include the statement on relaxed memory order
for REFCOUNT_FULL and tell that arch. specific implementations may vary on their properties
(as they do now).