On Thu, Jun 29, 2023 at 12:49:00PM -0400, Olivier Dion wrote:
> On Wed, 21 Jun 2023, "Paul E. McKenney" <paul...@kernel.org> wrote:
> > On Wed, Jun 07, 2023 at 02:53:52PM -0400, Olivier Dion wrote:
> >> -#ifdef __URCU_DEREFERENCE_USE_ATOMIC_CONSUME
> >> -# define _rcu_dereference(p) __extension__ ({
> >> \
> >> - __typeof__(__extension__ ({
> >> \
> >> - __typeof__(p) __attribute__((unused))
> >> _________p0 = { 0 }; \
> >> - _________p0;
> >> \
> >> - })) _________p1;
> >> \
> >> - __atomic_load(&(p), &_________p1,
> >> __ATOMIC_CONSUME); \
> >
> > There is talk of getting rid of memory_order_consume. But for the moment,
> > it is what there is. Another alternative is to use a volatile load,
> > similar to old-style CMM_LOAD_SHARED() or in-kernel READ_ONCE().
>
> I think we can stick to __ATOMIC_CONSUME for now. Hopefully getting rid
> of it means it will be an alias for __ATOMIC_ACQUIRE for ever.
That seems emininently reasonable to me!
Thanx, Paul
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