linux-kernel - Re: [PATCH V6 02/16] rv: Add runtime reactors interface

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Message-ID: <20220720134531.400b87af@gandalf.local.home>
Date:   Wed, 20 Jul 2022 13:45:31 -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 V6 02/16] rv: Add runtime reactors interface

On Wed, 20 Jul 2022 19:37:58 +0200
Daniel Bristot de Oliveira <bristot@...nel.org> wrote:

> > That has logic that looks to require a lock to protect things from changing
> > from underneath.  
> 
> ack, so the only variable I see we can use READ_ONCE/WRITE_ONCE is the reacting_on...

WRITE_ONCE() does not supply memory barriers, which you may need.

I'm only at patch 3, I'm not sure what the full requirements of that is.

-- Steve