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

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Date:   Thu, 21 Jul 2022 22:38:25 +0800
From:   Tao Zhou <tao.zhou@...ux.dev>
To:     Daniel Bristot de Oliveira <bristot@...nel.org>
Cc:     Steven Rostedt <rostedt@...dmis.org>,
        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>,
        Randy Dunlap <rdunlap@...radead.org>,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-trace-devel@...r.kernel.org, Tao Zhou <tao.zhou@...ux.dev>
Subject: Re: [PATCH V6 01/16] rv: Add Runtime Verification (RV) interface

On Tue, Jul 19, 2022 at 07:27:06PM +0200, Daniel Bristot de Oliveira wrote:

> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/init.h>
> +#include <linux/slab.h>
> +#include <rv/rv.h>
> +
> +#include "rv.h"
> +
> +DEFINE_MUTEX(rv_interface_lock);
> +/*
> + * Enable a given monitor.
> + */
> +static int enable_monitor(struct rv_monitor_def *mdef)
> +{
> +	int retval;
> +
> +	if (!mdef->monitor->enabled) {
> +		retval = mdef->monitor->enable();
> +		if (retval)
> +			return retval;
> +	}
> +
> +	mdef->monitor->enabled = 1;

This should be placed at the end of the last if block. Otherwise
another assignment may be duplicated because it is already 1 now.
no?(not sure how compiler treat this..)

> +
> +/*
> + * Interface to read the enable/disable status of a monitor.

I see the 'status' but look a little more this function is about the
description of monitor, so:
/* Interface to read the description message of a monitor */
or others.

> + */
> +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);