linux-kernel - Re: [PATCH] lib/Kconfig.debug: document panic= command line option for PANIC

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Date: Wed, 05 Jun 2024 20:05:23 +0200
From: Javier Martinez Canillas <javierm@...hat.com>
To: Brian Masney <bmasney@...hat.com>, akpm@...ux-foundation.org
Cc: linux-kernel@...r.kernel.org
Subject: Re: [PATCH] lib/Kconfig.debug: document panic= command line option
 for PANIC_TIMEOUT

Brian Masney <bmasney@...hat.com> writes:

Hello Brian,

> PANIC_TIMEOUT can also be controlled with the panic= kernel command line
> option, so let's reference it in the Kconfig help. This option is already
> documented in kernel-parameters.txt.
>
> Signed-off-by: Brian Masney <bmasney@...hat.com>
> ---
>  lib/Kconfig.debug | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
> index 59b6765d86b8..a6eb7425b888 100644
> --- a/lib/Kconfig.debug
> +++ b/lib/Kconfig.debug
> @@ -1043,7 +1043,8 @@ config PANIC_TIMEOUT
>  	  Set the timeout value (in seconds) until a reboot occurs when
>  	  the kernel panics. If n = 0, then we wait forever. A timeout
>  	  value n > 0 will wait n seconds before rebooting, while a timeout
> -	  value n < 0 will reboot immediately.
> +	  value n < 0 will reboot immediately. The kernel command line
> +	  option panic= may be used to override this option.
>  

Thanks for adding this, I wasn't aware of that panic= cmdline before.

Maybe it could also be mentioned that the timeout can be overriden by
user-space using the /proc/sys/kernel/panic sysfs entry too ?

Regardless, the patch looks good to me.

Reviewed-by: Javier Martinez Canillas <javierm@...hat.com>

-- 
Best regards,

Javier Martinez Canillas
Core Platforms
Red Hat