linux-kernel - Re: [PATCH V6 01/16] rv: Add Runtime Verification (RV) interface

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Date:   Wed, 20 Jul 2022 17:20:14 +0200
From:   Daniel Bristot de Oliveira <bristot@...nel.org>
To:     Steven Rostedt <rostedt@...dmis.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 01/16] rv: Add Runtime Verification (RV) interface

On 7/20/22 16:47, Steven Rostedt wrote:
> On Tue, 19 Jul 2022 19:27:06 +0200
> Daniel Bristot de Oliveira <bristot@...nel.org> wrote:
> 
>> +/*
>> + * Interface to read the enable/disable status of a monitor.
>> + */
>> +static ssize_t monitor_desc_read_data(struct file *filp, char __user *user_buf, size_t count,
>> +				      loff_t *ppos)
>> +{
>> +	struct rv_monitor_def *mdef = filp->private_data;
>> +	char buff[256];
>> +
>> +	memset(buff, 0, sizeof(buff));
>> +
>> +	mutex_lock(&rv_interface_lock);
>> +	snprintf(buff, sizeof(buff), "%s\n", mdef->monitor->description);
>> +	mutex_unlock(&rv_interface_lock);
> 
> What exactly is the mutex protecting here?

I placed it around all access on read/write in the interface,
but indeed, it is not needed here (static data). It is in a file inside
the monitor's directory... so the directory is there, and the
module is there as well.

-- Daniel