linux-kernel - Re: [PATCH V7 02/16] rv: Add runtime reactors interface

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Message-ID: <20220726122629.2a99cb6e@gandalf.local.home>
Date:   Tue, 26 Jul 2022 12:26:29 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Daniel Bristot de Oliveira <bristot@...nel.org>
Cc:     Wim Van Sebroeck <wim@...ux-watchdog.org>,
        Guenter Roeck <linux@...ck-us.net>,
        Jonathan Corbet <corbet@....net>,
        Ingo Molnar <mingo@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Peter Zijlstra <peterz@...radead.org>,
        Will Deacon <will@...nel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Marco Elver <elver@...gle.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        "Paul E. McKenney" <paulmck@...nel.org>,
        Shuah Khan <skhan@...uxfoundation.org>,
        Gabriele Paoloni <gpaoloni@...hat.com>,
        Juri Lelli <juri.lelli@...hat.com>,
        Clark Williams <williams@...hat.com>,
        Tao Zhou <tao.zhou@...ux.dev>,
        Randy Dunlap <rdunlap@...radead.org>,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-trace-devel@...r.kernel.org
Subject: Re: [PATCH V7 02/16] rv: Add runtime reactors interface

On Mon, 25 Jul 2022 22:11:14 +0200
Daniel Bristot de Oliveira <bristot@...nel.org> wrote:

> +/**
> + * reactor_cleanup_monitor - cleanup a monitor reference
> + * @mdef:       monitor's definition.
> + */
> +void reactor_cleanup_monitor(struct rv_monitor_def *mdef)
> +{
> +	mdef->rdef->counter--;
> +}
> +

Doesn't this require a lock? Also you might want to add a WARN_ONCE() if it
goes below zero.

-- Steve