On Mon, Sep 03, 2018 at 01:52:07PM -0400, Alan Stern wrote: > On Mon, 3 Sep 2018, Andrea Parri wrote: > > > In Cat speak, > > > > diff --git a/tools/memory-model/linux-kernel.cat b/tools/memory-model/linux-kernel.cat > > index 59b5cbe6b6240..fd9c0831adf0a 100644 > > --- a/tools/memory-model/linux-kernel.cat > > +++ b/tools/memory-model/linux-kernel.cat > > @@ -38,7 +38,7 @@ let strong-fence = mb | gp > > (* Release Acquire *) > > let acq-po = [Acquire] ; po ; [M] > > let po-rel = [M] ; po ; [Release] > > -let rfi-rel-acq = [Release] ; rfi ; [Acquire] > > +let po-rel-rf-acq-po = po ; [Release] ; rf ; [Acquire] ; po > > > > (**********************************) > > (* Fundamental coherence ordering *) > > @@ -60,13 +60,13 @@ let dep = addr | data > > let rwdep = (dep | ctrl) ; [W] > > let overwrite = co | fr > > let to-w = rwdep | (overwrite & int) > > -let to-r = addr | (dep ; rfi) | rfi-rel-acq > > +let to-r = addr | (dep ; rfi) > > let fence = strong-fence | wmb | po-rel | rmb | acq-po > > -let ppo = to-r | to-w | fence > > +let ppo = to-r | to-w | fence | (po-rel-rf-acq-po & int) > > > > (* Propagation: Ordering from release operations and strong fences. *) > > let A-cumul(r) = rfe? ; r > > -let cumul-fence = A-cumul(strong-fence | po-rel) | wmb > > +let cumul-fence = A-cumul(strong-fence | po-rel) | wmb | po-rel-rf-acq-po > > let prop = (overwrite & ext)? ; cumul-fence* ; rfe? > > > > (* > > I thought the goal you were aiming for was a patch making > atomic-acquire/ordinary-release be RCtso (along with lock/unlock), > while leaving ordinary-acquire/ordinary-release to remain RCpc. Such a patch would belong to the second approach (the "two distinct release-acquire" approach from my previous email). > Clearly that is not what this patch does. I meant the above ;-) to illustrate yet another approach (not that it makes me happy, as should be clear from previous posts ;-). Andrea > > Alan >
