Re: [PATCH RFC tip/core/rcu 12/15] lib/assoc_array: Remove smp_read_barrier_depends()

[Paul E. McKenney]

On Wed, Oct 11, 2017 at 10:06:31AM -0700, Paul E. McKenney wrote:
> On Wed, Oct 11, 2017 at 06:54:05PM +0200, Peter Zijlstra wrote:
> > On Wed, Oct 11, 2017 at 09:47:48AM -0700, Paul E. McKenney wrote:
> > > Interesting.  Do we currently have any dependencies headed by
> > > this_cpu_read()?
> > 
> > Nope, but almost, look for: cpufreq_update_util_data.
> 
> This, you mean?
> 
> data = rcu_dereference_sched(*this_cpu_ptr(&cpufreq_update_util_data));
> 
> True, a non-RCU dependency use case would want to use ACCESS_ONCE()
> in the new regime.

Right...  s/ACCESS_ONCE()/READ_ONCE()/

							Thanx, Paul