linux-kernel - Re: rcu: Add might_sleep() check to synchronize

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Message-ID: <20180323172843.763579a9@gandalf.local.home>
Date:   Fri, 23 Mar 2018 17:28:43 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Josh Triplett <josh@...htriplett.org>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        Lai Jiangshan <jiangshanlai@...il.com>,
        Joel Fernandes <joelaf@...gle.com>
Subject: Re: rcu: Add might_sleep() check to synchronize_rcu()

On Fri, 23 Mar 2018 22:12:24 +0100 (CET)
Thomas Gleixner <tglx@...utronix.de> wrote:

> synchronize_rcu() lacks a might_sleep() check which would have caught that
> issue way earlier because it would trigger with the minimal debug options
> enabled.
> 
> Add a might_sleep() check to catch such cases.

I'm not against the patch, but really? I would think that
synchronize_rcu() would pretty much always schedule, and scheduling
from atomic would have triggered with minimal debug options enabled.

-- Steve