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SubjectRe: rcu: Merge RCU-bh into RCU-preempt
On Thu, Nov 08, 2018 at 05:02:57PM +0100, Sebastian Andrzej Siewior wrote:
> 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?

No, rcu_read_lock_bh() and rcu_read_unlock_bh() are unchanged in v4.20.
With the new RCU grace-period mechanism, local_bh_disable() blocks future
grace periods on its own.

Unless I am missing something (quite probable, actually), the v4.20
definitions of rcu_read_lock_bh() and rcu_read_unlock_bh() should work
as-is for -rt.

Thanx, Paul

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