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From: Guenter Roeck <linux@roeck-us.net>
To: Jiri Slaby <jirislaby@kernel.org>,
	Curtis Klein <curtis.klein@hpe.com>,
	wim@linux-watchdog.org
Cc: linux-watchdog@vger.kernel.org
Subject: Re: [PATCH v3] watchdog: Add hrtimer-based pretimeout feature
Date: Thu, 2 Sep 2021 07:05:15 -0700	[thread overview]
Message-ID: <7fdd262e-84fb-0c34-baa9-162130f1e109@roeck-us.net> (raw)
In-Reply-To: <67d601c9-8f95-cb10-40df-4d962ec6f9ba@kernel.org>

On 9/1/21 11:55 PM, Jiri Slaby wrote:
> 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?
> 

AFAICS the timer does not stop on reboot. I think we'll need to augment the code
to do that.

Guenter

> ...
>> --- 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,


  reply	other threads:[~2021-09-02 14:05 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-02-03 20:11 Curtis Klein
2021-02-04  1:35 ` Guenter Roeck
2021-09-02  6:55 ` Jiri Slaby
2021-09-02 14:05   ` Guenter Roeck [this message]
2021-09-04  8:16     ` was [Re: [PATCH v3] watchdog: Add hrtimer-based pretimeout feature] Jiri Slaby
     [not found]       ` <54d77fb1-2531-c6ed-738e-9f661443b097@kernel.org>
2021-09-05 22:22         ` Klein, Curtis
2021-09-05 22:56           ` Guenter Roeck

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