On 2018-11-01 16:18:04 [-0700], Paul E. McKenney wrote:

The need for this goes away as of the current merge window because
RCU-bh has gone away.  (Aside from still being able to do things
like rcu_read_lock_bh() as a documentation device.)

So in -RT rcu_read_lock_bh() does
 { local_bh_disable() ;  rcu_read_lock() }

So you are saying that this is also the case in v4.20?

							Thanx, Paul

Sebastian