Re: [PATCH 5/7] block: Remove superflous rcu_read_[un]lock_sched() in blk_queue_enter()

[Peter Zijlstra]

On Wed, Mar 14, 2018 at 08:05:30PM +0000, Bart Van Assche wrote:
> Can you clarify this further? From <linux/rcupdate.h>:
> 
> static inline void synchronize_rcu(void)
> {
>       synchronize_sched();
> }

You'll find that is for !CONFIG_PREEMPT_RCU.