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

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Message-ID: <20220720124133.3cdd2c44@gandalf.local.home>
Date:   Wed, 20 Jul 2022 12:41:33 -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 Tue, 19 Jul 2022 19:27:07 +0200
Daniel Bristot de Oliveira <bristot@...nel.org> wrote:

> +/*
> + * reacting_on interface.
> + */
> +static ssize_t reacting_on_read_data(struct file *filp,
> +				     char __user *user_buf,
> +				     size_t count, loff_t *ppos)
> +{
> +	char *buff;
> +
> +	mutex_lock(&rv_interface_lock);
> +	buff = reacting_on ? "1\n" : "0\n";
> +	mutex_unlock(&rv_interface_lock);

Again, no need for the locks, but perhaps just to keep things sane:

	buf = READ_ONCE(reacting_on) ? "1\n" : "0\n";

-- Steve

> +
> +	return simple_read_from_buffer(user_buf, count, ppos, buff, strlen(buff)+1);
> +}
> +