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

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Date:	Tue, 29 Mar 2011 12:22:40 -0700
From:	Daniel Walker <dwalker@...o99.com>
To:	Jeff Ohlstein <johlstei@...eaurora.org>
Cc:	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

On Fri, 2011-03-25 at 19:18 -0700, Jeff Ohlstein wrote:
> The msm watchdog driver is present in kernel only. It does not use the
> built-in Linux watchdog api. This is because the primary function of
> our watchdog is detecting bus lockups and interrupts being turned off
> for long periods of time. We wanted this functionality to be present
> regardless of the userspace the kernel is running beneath. Userspace
> is
> free to have its own watchdog implemented in software. 

Are you saying this is mostly a debugging facility ? The interrupts off
thing I can see as just debugging, but I don't understand the bus
lockups part.

Daniel

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