linux-kernel - Re: [PATCH V9 01/16] rv: Add Runtime Verification (RV) interface

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Date:   Sun, 31 Jul 2022 13:53:55 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Daniel Bristot de Oliveira <bristot@...nel.org>
Cc:     Tao Zhou <tao.zhou@...ux.dev>,
        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
Subject: Re: [PATCH V9 01/16] rv: Add Runtime Verification (RV) interface

On Sun, 31 Jul 2022 19:49:23 +0200
Daniel Bristot de Oliveira <bristot@...nel.org> wrote:

> On 7/31/22 19:01, Steven Rostedt wrote:
> > static int da_monitor_init_##name(void)                                                         \
> > {                                                                                               \
> >         int slot;                                                                               \
> >                                                                                                 \
> >         slot = rv_get_task_monitor_slot();  <- if this returns positive, things break           \
> >         if (slot < 0 || slot >= RV_PER_TASK_MONITOR_INIT)                                       \
> > 
> > And we probably need slot to be negative if it is greater or equal to RV_PER_TASK_MONITOR_INIT.
> > 
> >                 return slot;                                                                    \
> >                                   
> 
> ok, there will be a problem when RV_PER_TASK_MONITOR_INIT changes to > 1. This will need to be patched to
> return negative. So far we have only one because there is only one per task monitor.
> 

Exactly. And reviewers like Tao and myself are going to continue to
flag it as a bug as we don't assume that RV_PER_TASK_MONITOR_INIT will
stay 1 ;-)

-- Steve