On Tue, Feb 09, 2016 at 11:22:04AM +0000, Wenbo Wang wrote: > In most cases, rcu read lock is just a preempt_disable, which is what get_cpu > does. I don't see any risk.
Yes, many rcu_read_lock cases expand similarly to get_cpu. What about the other cases? FWIW, I don't think we'll hit the problem with the proposed rcu sync. Heck, we don't even have a synchronize today and we don't hit the theoretical problem.
