linux-kernel - Re: [PATCH 0/8] watchdog: Add support for keepalives triggered by infrastructure

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Message-ID: <20150805082721.GY9999@pengutronix.de>
Date:	Wed, 5 Aug 2015 10:27:21 +0200
From:	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>
To:	Guenter Roeck <linux@...ck-us.net>
Cc:	Pádraig Brady <P@...igBrady.com>,
	linux-watchdog@...r.kernel.org, Wim Van Sebroeck <wim@...ana.be>,
	linux-kernel@...r.kernel.org,
	Timo Kokkonen <timo.kokkonen@...code.fi>,
	linux-doc@...r.kernel.org, Jonathan Corbet <corbet@....net>,
	kernel@...gutronix.de
Subject: Re: [PATCH 0/8] watchdog: Add support for keepalives triggered by
 infrastructure

Hello Guenter,

On Wed, Aug 05, 2015 at 12:50:25AM -0700, Guenter Roeck wrote:
> On 08/05/2015 12:36 AM, Uwe Kleine-König wrote:
> >the watchdog I'm currently working with on a powerpc platform has a
> >unchangable timeout of ~1 s. To make the machine boot I patched the
> >bootloader and need some automatic pinging in the kernel before
> >userspace takes over.
> >
> 
> Does using arch_initcall in the watchdog driver help here, or is that
> still too slow and you really need to hack the kernel ?

I didn't do any measurements yet, but having the bootloader extracting
the kernel, and then send a ping before jumping into it is good enough
even without CONFIG_GPIO_WATCHDOG_ARCH_INITCALL to get the machine up.
(Userspace doesn't do any watchdog handling yet.)

Best regards
Uwe

-- 
Pengutronix e.K.                           | Uwe Kleine-König            |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |
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