linux-kernel - Re: [PATCH V5 04/16] rv/include: Add deterministic automata monitor definition via C macros

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Date:   Mon, 18 Jul 2022 09:54:16 +0200
From:   Daniel Bristot de Oliveira <bristot@...nel.org>
To:     Tao Zhou <tao.zhou@...ux.dev>
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
Subject: Re: [PATCH V5 04/16] rv/include: Add deterministic automata monitor
 definition via C macros

On 7/17/22 17:18, Tao Zhou wrote:
>> +static int task_mon_slot_##name = RV_PER_TASK_MONITOR_INIT;			\
> In patch1, RV_PER_TASK_MONITOR_INIT is defined as:
> 
> #define RV_PER_TASK_MONITORS           1
> #define RV_PER_TASK_MONITOR_INIT	  (RV_PER_TASK_MONITORS)
> 
> RV_PER_TASK_MONITOR_INIT is 1 now, seems not the index of the first only
> element in vector. Now no map here, one task has one monitor though if I
> am not wrong.
> So task_mon_slot_##name must be defined to the index of first element.
> Modify the macro definition of RV_PER_TASK_MONITOR_INIT to the index of
> first element in vector.
> 
> #define RV_PER_TASK_MONITOR_INIT	  (RV_PER_TASK_MONITORS) - 1

nop, (RV_PER_TASK_MONITORS) is an invalid vector value, so we can detect things like:
disabling a disabled monitor.

(I forgot to reset it when disabling a monitor... added)

-- Daniel