linux-kernel - Re: [PATCH] rcutorture: Avoid soft lockup during cpu stall

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Date:   Wed, 10 Nov 2021 09:24:00 -0300
From:   Wander Costa <wcosta@...hat.com>
To:     paulmck@...nel.org
Cc:     wander@...hat.com, Davidlohr Bueso <dave@...olabs.net>,
        Josh Triplett <josh@...htriplett.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        Lai Jiangshan <jiangshanlai@...il.com>,
        Joel Fernandes <joel@...lfernandes.org>,
        "open list:TORTURE-TEST MODULES" <linux-kernel@...r.kernel.org>,
        "open list:READ-COPY UPDATE (RCU)" <rcu@...r.kernel.org>
Subject: Re: [PATCH] rcutorture: Avoid soft lockup during cpu stall

On Tue, Nov 9, 2021 at 5:47 PM Paul E. McKenney <paulmck@...nel.org> wrote:
>
> On Tue, Nov 09, 2021 at 02:46:02PM -0300, wander@...hat.com wrote:
> > From: Wander Lairson Costa <wander@...hat.com>
> >
> > If we use the module stall_cpu option, we may get a soft lockup warning
> > if we also don't pass the stall_cpu_block option.
> >
> > We introduce the stall_no_softlockup option to avoid a soft lockup on
> > cpu stall even if we don't use the stall_cpu_block option.
> >
> > Signed-off-by: Wander Lairson Costa <wander@...hat.com>
>
> This looks plausible to me, though it would be good to hear others'
> thoughts.  In the meantime, could you please forward-port this to
> the "dev" branch of the -rcu tree?
>
> https://mirrors.edge.kernel.org/pub/linux/kernel/people/paulmck/rcutodo.html
>
>                                                         Thanx, Paul
>

Thank you for the feedback. I just sent a v2 against that applies to
the aforementioned branch.

Cheers,
Wander

[snip]