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. Thanx, Paul
