linux-kernel - Re: [PATCH] srcu: Remove srcu_queue_delayed_work

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Message-ID: <20181213150358.bgrwgpp5am5w53ie@linutronix.de>
Date:   Thu, 13 Dec 2018 16:03:58 +0100
From:   Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:     Boqun Feng <boqun.feng@...il.com>
Cc:     Joel Fernandes <joel@...lfernandes.org>,
        linux-kernel@...r.kernel.org,
        Lai Jiangshan <jiangshanlai@...il.com>,
        "Paul E. McKenney" <paulmck@...ux.ibm.com>,
        Josh Triplett <josh@...htriplett.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        tglx@...utronix.de, tj@...nel.org
Subject: Re: [PATCH] srcu: Remove srcu_queue_delayed_work_on()

On 2018-12-12 22:05:19 [+0800], Boqun Feng wrote:
> So Jiangshan and TJ, what's your opion on this one? If we call a
> queue_work_on() at a place where that target cpu may be offlined, I
> think we have the guarantee that the work will be eventually executed
> even if the cpu is never online again, right? In other words, if a cpu
> has been online once, queue_work_on() on it will be free from racing
> with cpu hotplug.
> 
> Am I right about this, or did I miss something subtle?

tj answered this one:
  https://lkml.kernel.org/r/20180919205521.GE902964@devbig004.ftw2.facebook.com

> Regards,
> Boqun

Sebastian