Re: [PATCH v2] tools/memory-model: Add extra ordering for locks and remove it for ordinary release/acquire

[Andrea Parri]

> >   ACQUIRE operations include LOCK operations and both smp_load_acquire()
> >   and smp_cond_acquire() operations.  [BTW, the latter was replaced by
> >   smp_cond_load_acquire() in 1f03e8d2919270 ...]
> > 
> >   RELEASE operations include UNLOCK operations and smp_store_release()
> >   operations. [...]
> > 
> >   [...] after an ACQUIRE on a given variable, all memory accesses
> >   preceding any prior RELEASE on that same variable are guaranteed
> >   to be visible.
> 
> As far as I can see, these statements remain valid.

Interesting; ;-)  What does these statement tells you ;-)  when applied
to a: and b: below?

  a: WRITE_ONCE(x, 1); // "preceding any prior RELEASE..."
  smp_store_release(&s, 1);
  smp_load_acquire(&s);
  b: WRITE_ONCE(y, 1); // "after an ACQUIRE..."

  Andrea