linux-kernel - Re: [PATCH] init/main.c Enable watchdog

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Message-ID: <cc05c205-5f98-4709-96d0-947a9316f0c5@infradead.org>
Date:   Wed, 24 Oct 2018 08:32:39 -0700
From:   Randy Dunlap <rdunlap@...radead.org>
To:     Laurence Oberman <loberman@...hat.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] init/main.c Enable watchdog_thresh control from kernel
 line

Hi,

On 10/24/18 8:21 AM, Laurence Oberman wrote:
> Both graphics and serial consoels are exposed to hard lockups

                           consoles

> when handling a large amount of messaging. The kernel watchdog_thresh
> parameter up to now has not been available to be set on the kernel line for
> early boot. 
> This patch allows the setting of watchdog_thresh to be increased
> when needed to avoid the hard lockups in the console code.
> 
> Signed-off-by: Laurence Oberman <loberman@...hat.com>

Please add corresponding documentation to the
Documentation/admin-guide/kernel-parameters.txt file.

Thanks.

> ---
>  init/main.c | 9 +++++++++
>  1 file changed, 9 insertions(+)
> 
> diff --git a/init/main.c b/init/main.c
> index e4a3160..5882750 100644
> --- a/init/main.c
> +++ b/init/main.c
> @@ -977,6 +977,15 @@ static int __init set_debug_rodata(char *str)
>  __setup("rodata=", set_debug_rodata);
>  #endif
>  
> +static int __init
> +is_watchdog_thresh_setup(char *str)
> +{
> +	get_option(&str, &watchdog_thresh);
> +	return 1;
> +}
> +__setup("watchdog_thresh=", is_watchdog_thresh_setup);
> +
> +
>  #ifdef CONFIG_STRICT_KERNEL_RWX
>  static void mark_readonly(void)
>  {
> 


-- 
~Randy