Re: [PATCH tip/core/rcu 16/27] rcu: Add comment documenting how rcu_seq_snap works

[Peter Zijlstra]

On Tue, Jun 26, 2018 at 12:31:46PM -0700, Paul E. McKenney wrote:
> > Then the existing comment is misleading and really needs change.
> 
> Would it be sufficient to add something like "The memory barrier is
> required to support the many-to-many ordering guaranteed by RCU grace
> periods"?

What would lead me to wonder why after the load and not (also) before.