linux-kernel - Re: [PATCH v7 5/8] Watchdog: introduce ARM SBSA watchdog driver

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Message-ID: <55F20461.20904@redhat.com>
Date:	Thu, 10 Sep 2015 18:29:53 -0400
From:	Jon Masters <jcm@...hat.com>
To:	fu.wei@...aro.org, Suravee.Suthikulpanit@....com,
	hanjun.guo@...aro.org, linaro-acpi@...ts.linaro.org,
	linux-watchdog@...r.kernel.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org
CC:	tekkamanninja@...il.com, graeme.gregory@...aro.org,
	al.stone@...aro.org, arnd@...db.de, linux@...ck-us.net,
	vgandhi@...eaurora.org, wim@...ana.be, leo.duran@....com,
	corbet@....net, mark.rutland@....com, catalin.marinas@....com,
	will.deacon@....com, rjw@...ysocki.net, dyoung@...hat.com,
	panand@...hat.com
Subject: Re: [PATCH v7 5/8] Watchdog: introduce ARM SBSA watchdog driver

On 08/24/2015 01:01 PM, fu.wei@...aro.org wrote:

> +	/*
> +	 * Get the frequency of system counter from the cp15 interface of ARM
> +	 * Generic timer. We don't need to check it, because if it returns "0",
> +	 * system would panic in very early stage.
> +	 */
> +	gwdt->clk = arch_timer_get_cntfrq();

Just thinking out loud...

What happens later if we virtualize this device within KVM/QEMU/Xen and
then live migrate to another system in which the frequency changes?

Jon.

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