linux-kernel - Re: [PATCH 5/7] block: Remove superflous rcu_read_[un]lock_sched() in blk_queue

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Message-ID: <20180314200846.GR4064@hirez.programming.kicks-ass.net>
Date:   Wed, 14 Mar 2018 21:08:46 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Bart Van Assche <Bart.VanAssche@....com>
Cc:     "tj@...nel.org" <tj@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "jannh@...gle.com" <jannh@...gle.com>,
        "bcrl@...ck.org" <bcrl@...ck.org>,
        "torvalds@...ux-foundation.org" <torvalds@...ux-foundation.org>,
        "kernel-team@...com" <kernel-team@...com>,
        "security@...nel.org" <security@...nel.org>,
        "kent.overstreet@...il.com" <kent.overstreet@...il.com>,
        "viro@...iv.linux.org.uk" <viro@...iv.linux.org.uk>,
        "axboe@...nel.dk" <axboe@...nel.dk>,
        "paulmck@...ux.vnet.ibm.com" <paulmck@...ux.vnet.ibm.com>
Subject: Re: [PATCH 5/7] block: Remove superflous rcu_read_[un]lock_sched()
 in blk_queue_enter()

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.