On Fri, Jun 24, 2016 at 09:34:30AM -0700, Davidlohr Bueso wrote: > On Thu, 23 Jun 2016, Peter Zijlstra wrote: > > >- > >/* atomic_fetch_inc_relaxed */ > >#ifndef atomic_fetch_inc_relaxed > >+ > >+#ifndef atomic_fetch_inc > > #define atomic_fetch_inc(v) (atomic_fetch_add(1, v))
Ah yes. > >+#define atomic_fetch_inc_relaxed(v) atomic_fetch_add_relaxed(1, (v)) > >+#define atomic_fetch_inc_acquire(v) atomic_fetch_add_acquire(1, (v)) > >+#define atomic_fetch_inc_release(v) atomic_fetch_add_release(1, (v)) > > I was under the impression that if the archs don't define their own calls, > then we always default to fully ordered. Which is why I based all this > ifdefery > on what is currently done with the other atomic_fetch_$ops. Right, but this allows an arch to only define atomic_fetch_add_relaxed() and have the various forms of fetch_inc() instantiated as well. With your earlier version they would all fall back to the fully sequential variant of fetch_add().
