linux-kernel - Re: [PATCH] msm: watchdog: support watchdog on 8x60 and 8960

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Date:	Thu, 28 Apr 2011 17:19:10 +0000
From:	Pavel Machek <pavel@....cz>
To:	Jamie Iles <jamie@...ieiles.com>
Cc:	Daniel Walker <dwalker@...o99.com>,
	Jeff Ohlstein <johlstei@...eaurora.org>,
	Bryan Huntsman <bryanh@...eaurora.org>,
	David Brown <davidb@...eaurora.org>,
	linux-arm-msm@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Russell King <linux@....linux.org.uk>,
	Stepan Moskovchenko <stepanm@...eaurora.org>,
	Gregory Bean <gbean@...eaurora.org>,
	Abhijeet Dharmapurikar <adharmap@...eaurora.org>
Subject: Re: [PATCH] msm: watchdog: support watchdog on 8x60 and 8960

> > It doesn't sound too different that all the other watchdogs in
> > drivers/watchdog/ .. Your just detecting lockups right?
> 
> There are some watchdogs in there such as 
> drivers/watchdog/at91sam9_wdt.c that can't be stopped once enabled so 
> the driver sets up a soft timer in the kernel that kicks the watchdog to 
> prevent the system rebooting.
> 
> With this approach you could have the watchdog always enabled and being 
> kicked even if the userspace daemon wasn't running, but with the 
> flexibility of kicking it from userspace if you wanted.

sounds like a way to do it.

-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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