linux-kernel - Re: [PATCH V4 13/20] rv/reactor: Add the panic reactor

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Date:   Tue, 28 Jun 2022 15:06:34 -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>,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-trace-devel@...r.kernel.org
Subject: Re: [PATCH V4 13/20] rv/reactor: Add the panic reactor

On Thu, 16 Jun 2022 10:44:55 +0200
Daniel Bristot de Oliveira <bristot@...nel.org> wrote:

> Sample reactor that panics the system when an exception is found. This
> is useful both to capture a vmcore, or to fail-safe a critical system.
> 
> Cc: Wim Van Sebroeck <wim@...ux-watchdog.org>
> Cc: Guenter Roeck <linux@...ck-us.net>
> Cc: Jonathan Corbet <corbet@....net>
> Cc: Steven Rostedt <rostedt@...dmis.org>
> Cc: Ingo Molnar <mingo@...hat.com>
> Cc: Thomas Gleixner <tglx@...utronix.de>
> Cc: Peter Zijlstra <peterz@...radead.org>
> Cc: Will Deacon <will@...nel.org>
> Cc: Catalin Marinas <catalin.marinas@....com>
> Cc: Marco Elver <elver@...gle.com>
> Cc: Dmitry Vyukov <dvyukov@...gle.com>
> Cc: "Paul E. McKenney" <paulmck@...nel.org>
> Cc: Shuah Khan <skhan@...uxfoundation.org>
> Cc: Gabriele Paoloni <gpaoloni@...hat.com>
> Cc: Juri Lelli <juri.lelli@...hat.com>
> Cc: Clark Williams <williams@...hat.com>
> Cc: linux-doc@...r.kernel.org
> Cc: linux-kernel@...r.kernel.org
> Cc: linux-trace-devel@...r.kernel.org
> Signed-off-by: Daniel Bristot de Oliveira <bristot@...nel.org>
> ---
>  kernel/trace/rv/Kconfig         |  8 ++++++
>  kernel/trace/rv/Makefile        |  1 +
>  kernel/trace/rv/reactor_panic.c | 44 +++++++++++++++++++++++++++++++++
>  3 files changed, 53 insertions(+)
>  create mode 100644 kernel/trace/rv/reactor_panic.c
> 
> diff --git a/kernel/trace/rv/Kconfig b/kernel/trace/rv/Kconfig
> index be8e3dab0a52..91a17b13a080 100644
> --- a/kernel/trace/rv/Kconfig
> +++ b/kernel/trace/rv/Kconfig
> @@ -60,4 +60,12 @@ config RV_REACT_PRINTK
>  	  Enables the printk reactor. The printk reactor emmits a printk()
>  	  message if an exception is found.
>  
> +config RV_REACT_PANIC
> +	bool "Panic reactor"
> +	depends on RV_REACTORS
> +	default y if RV_REACTORS

Just put default y if it already depends on RV_REACTORS.

-- Steve

> +	help
> +	  Enables the panic reactor. The panic reactor emmits a printk()
> +	  message if an exception is found and panic()s the system.
> +
>  endif # RV
> diff --git a/kernel/trace/rv/Makefile b/kernel/trace/rv/Makefile