linux-kernel - Re: [PATCH] cgroup/cpuset: fix circular locking dependency

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Message-ID: <20180109034211.GC3668920@devbig577.frc2.facebook.com>
Date:   Mon, 8 Jan 2018 19:42:11 -0800
From:   Tejun Heo <tj@...nel.org>
To:     "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Cc:     Prateek Sood <prsood@...eaurora.org>,
        Peter Zijlstra <peterz@...radead.org>, avagin@...il.com,
        mingo@...nel.org, linux-kernel@...r.kernel.org,
        cgroups@...r.kernel.org, sramana@...eaurora.org
Subject: Re: [PATCH] cgroup/cpuset: fix circular locking dependency

Hello, Paul.

On Mon, Jan 08, 2018 at 04:31:27PM -0800, Paul E. McKenney wrote:
> +static int __init rcu_init_wq_rescuer(void)
> +{
> +	WARN_ON(init_rescuer(rcu_gp_workqueue));
> +	return 0;
> +}
> +core_initcall(rcu_init_wq_rescuer);

So, what I don't get is why RCU needs to call this explicitly.
core_initcall() is after workqueue_init() anyway.  Why am I missing?

Thanks.

-- 
tejun