Re: [RFC][PATCH 2/6] lockdep: validate rcu_dereference() vs rcu_read_lock()

Dmitry Torokhov
2007-09-19T14:17:35Z

Hi Peter,

On 9/19/07, Peter Zijlstra <a.p.zijlstra@chello.nl> wrote:
> Warn when rcu_dereference() is not used in combination with rcu_read_lock()
>

According to Paul it is fine to use RCU primitives (when accompanied
with proper comments) when the read-size critical section is guarded
by spin_lock_irqsave()/spin_lock_irqsrestore() instead of
rcu_read_lock()/rcu_read_unlock() and writers synchronize with
synchronize_sched(), not synchronize_rcu(). Your patch will trigger
warnign on such valid usages.

--
Dmitry