On Mon, Nov 09, 2020 at 01:21:33PM +0100, Peter Zijlstra wrote: > On Thu, Nov 05, 2020 at 03:05:07PM -0800, paulmck@xxxxxxxxxx wrote: > > From: "Paul E. McKenney" <paulmck@xxxxxxxxxx> > > > > This commit adds an explanation of the special cases where READ_ONCE() > > may be used in place of a member of the rcu_dereference() family. > > I am confused, there is no actual difference between rcu_dereference() > and READ_ONCE() today. So we _may_ use READ_ONCE() at all times. > > Now granted, we probably don't want that, but that does leave me > somewhat confused vs the wording here. There is a difference from the viewpoint of both lockdep and sparse. Or am I missing your point? Thanx, Paul
