linux-kernel - Re: [PATCH 1/2] workqueue: Use normal rcu

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Message-ID: <20190408193802.GJ1975820@devbig004.ftw2.facebook.com>
Date:   Mon, 8 Apr 2019 12:38:02 -0700
From:   Tejun Heo <tj@...nel.org>
To:     Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Cc:     linux-kernel@...r.kernel.org,
        Lai Jiangshan <jiangshanlai@...il.com>,
        Ingo Molnar <mingo@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH 1/2] workqueue: Use normal rcu

On Wed, Mar 13, 2019 at 05:55:47PM +0100, Sebastian Andrzej Siewior wrote:
> From: Thomas Gleixner <tglx@...utronix.de>
> 
> There is no need for sched_rcu. The undocumented reason why sched_rcu
> is used is to avoid a few explicit rcu_read_lock()/unlock() pairs by
> the fact that sched_rcu reader side critical sections are also protected
> by preempt or irq disabled regions.
> 
> Replace rcu_read_lock_sched with rcu_read_lock and acquire the RCU lock
> where it is not yet explicit acquired. Replace local_irq_disable() with
> rcu_read_lock(). Update asserts.
> 
> Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
> [bigeasy: mangle changelog a little]
> Signed-off-by: Sebastian Andrzej Siewior <bigeasy@...utronix.de>

Applied to wq/for-5.2.

Thanks.

-- 
tejun