linux-kernel - Re: [PATCH RFC] Watchdog: sbsa

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Date:	Wed, 4 May 2016 11:17:29 -0500
From:	Timur Tabi <timur@...eaurora.org>
To:	Pratyush Anand <panand@...hat.com>
Cc:	Guenter Roeck <linux@...ck-us.net>, fu.wei@...aro.org,
	Suravee.Suthikulpanit@....com, wim@...ana.be,
	linux-arm-kernel@...ts.infradead.org,
	linux-watchdog@...r.kernel.org,
	open list <linux-kernel@...r.kernel.org>,
	Dave Young <dyoung@...hat.com>,
	Wim Van Sebroeck <wim@...ana.be>
Subject: Re: [PATCH RFC] Watchdog: sbsa_gwdt: Enhance timeout range

Pratyush Anand wrote:
> Its unique to SBSA because you have very little timeout here. kexec-tools
> upstream does not have any mechanism to handle watchdog timeout. Lets say even
> if we implement a framework there, the best it can do is to ping the watchdog
> again.

Ok, so it's more accurate to say that kexec has a minimum watchdog 
timeout requirement.  What happens if the system admin sets the timeout 
to 5 seconds arbitrarily?  The system will reset during kexec, no matter 
which hardware is used.

This still sounds like a band-aid to me.  We're just assuming that we 
need a timeout of at least 20 seconds to support kexec.  Frankly, this 
still sounds like a problem the kexec developers needs to acknowledge 
and deal with.

Still I'm okay with a patch that extends the timeout by programming WCV, 
but it has to be commented as a hack specifically to support kexec 
because the timeout might be too short.  Then Wim can decide whether he 
supports such changes.

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