Re: [PATCH] refcount_t: add ACQUIRE ordering on success for dec(sub)_and_test variants

[Peter Zijlstra]

On Wed, Jan 30, 2019 at 01:31:31PM +0100, Andrea Parri wrote:
> On Wed, Jan 30, 2019 at 01:18:51PM +0200, Elena Reshetova wrote:
> > This adds an smp_acquire__after_ctrl_dep() barrier on successful
> > decrease of refcounter value from 1 to 0 for refcount_dec(sub)_and_test
> > variants and therefore gives stronger memory ordering guarantees than
> > prior versions of these functions.
> > 
> > Co-developed-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
> > Signed-off-by: Elena Reshetova <elena.reshetova@xxxxxxxxx>
> 
> Reviewed-by: Andrea Parri <andrea.parri@xxxxxxxxxxxxxxxxxxxx>

Thanks, got it queued now.