Re: [PATCH v3] watchdog: Add hrtimer-based pretimeout feature

[Jiri Slaby <jirislaby@kernel.org>]

On 03. 02. 21, 21:11, Curtis Klein wrote:
> This adds the option to use a hrtimer to generate a watchdog pretimeout
> event for hardware watchdogs that do not natively support watchdog
> pretimeouts.
> 
> With this enabled, all watchdogs will appear to have pretimeout support
> in userspace. If no pretimeout value is set, there will be no change in
> the watchdog's behavior.

Hi,

on my Dell Latitude 7280, CONFIG_WATCHDOG_HRTIMER_PRETIMEOUT=y causes 
all reboot, kexec, suspend to panic. Disabling that option makes it all 
work again. Provided it happens very late in the process, I don't know 
how to grab some logs...

Any ideas?

...
> --- a/drivers/watchdog/Kconfig
> +++ b/drivers/watchdog/Kconfig
> @@ -73,6 +73,14 @@ config WATCHDOG_SYSFS
>   	  Say Y here if you want to enable watchdog device status read through
>   	  sysfs attributes.
>   
> +config WATCHDOG_HRTIMER_PRETIMEOUT
> +	bool "Enable watchdog hrtimer-based pretimeouts"
> +	help
> +	  Enable this if you want to use a hrtimer timer based pretimeout for
> +	  watchdogs that do not natively support pretimeout support. Be aware
> +	  that because this pretimeout functionality uses hrtimers, it may not
> +	  be able to fire before the actual watchdog fires in some situations.

thanks,
-- 
js
suse labs