linux-kernel - Re: [PATCH v4 5/7] Watchdog: introduce ARM SBSA watchdog driver

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Message-ID: <20150914042104.GA4682@localhost.localdomain>
Date:	Mon, 14 Sep 2015 09:51:04 +0530
From:	Pratyush Anand <panand@...hat.com>
To:	Jon Masters <jcm@...hat.com>, Timur Tabi <timur@...eaurora.org>,
	Guenter Roeck <linux@...ck-us.net>, fu.wei@...aro.org
Cc:	Suravee.Suthikulpanit@....com, linaro-acpi@...ts.linaro.org,
	linux-watchdog@...r.kernel.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org,
	tekkamanninja@...il.com, graeme.gregory@...aro.org,
	al.stone@...aro.org, hanjun.guo@...aro.org,
	ashwin.chaugule@...aro.org, arnd@...db.de, vgandhi@...eaurora.org,
	wim@...ana.be, leo.duran@....com, corbet@....net,
	mark.rutland@....com, catalin.marinas@....com, will.deacon@....com,
	rjw@...ysocki.net
Subject: Re: [PATCH v4 5/7] Watchdog: introduce ARM SBSA watchdog driver

On 10/09/2015:06:45:17 PM, Jon Masters wrote:
> On 06/03/2015 02:53 PM, Timur Tabi wrote:
> > On 06/03/2015 01:25 PM, Guenter Roeck wrote:
> >> In general the idea here would be to use a crashdump kernel, which,
> >> when loaded, would reset the watchdog before it fires. This kernel
> >> would then write a core dump to a specified location.

And this is what we do in fedora or RHEL. There had been some work ongoing in
fedora [1][2] which will help to reset any active watchdog in kdump kernel(if
the watchdog driver has been registered to watchdog_class). It will eventually
help a watchdog on ARM64 platform as well.

[1] https://lists.fedoraproject.org/pipermail/kexec/2015-September/002295.html
[2] https://github.com/pratyushanand/kexec-tools/commits/watchdog_fmaster

~Pratyush
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