linux-kernel - Re: [PATCH v2 5/7] Watchdog: introduce "pretimeout" into framework

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Message-ID: <20150522150554.GB2930@roeck-us.net>
Date:	Fri, 22 May 2015 08:05:54 -0700
From:	Guenter Roeck <linux@...ck-us.net>
To:	Fu Wei <fu.wei@...aro.org>
Cc:	Timo Kokkonen <timo.kokkonen@...code.fi>,
	Suravee Suthikulpanit <Suravee.Suthikulpanit@....com>,
	Linaro ACPI Mailman List <linaro-acpi@...ts.linaro.org>,
	linux-watchdog@...r.kernel.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org,
	Wei Fu <tekkamanninja@...il.com>,
	G Gregory <graeme.gregory@...aro.org>,
	Al Stone <al.stone@...aro.org>,
	Hanjun Guo <hanjun.guo@...aro.org>,
	Timur Tabi <timur@...eaurora.org>,
	Ashwin Chaugule <ashwin.chaugule@...aro.org>,
	Arnd Bergmann <arnd@...db.de>, vgandhi@...eaurora.org,
	wim@...ana.be, Jon Masters <jcm@...hat.com>,
	Leo Duran <leo.duran@....com>, Jon Corbet <corbet@....net>,
	Mark Rutland <mark.rutland@....com>
Subject: Re: [PATCH v2 5/7] Watchdog: introduce "pretimeout" into framework

On Fri, May 22, 2015 at 10:38:32PM +0800, Fu Wei wrote:
> Hi Guenter.
> 
> Sorry for my poor English .
> let me explain this :
> 
> On 22 May 2015 at 21:23, Guenter Roeck <linux@...ck-us.net> wrote:
> > On 05/22/2015 03:46 AM, Fu Wei wrote:
> >>
> >> Hi Timo,
> >>
> > [ ... ]
> >
> >> So I am still trying to improve pretimeout support :-)
> >
> >
> > Is there anything still missing from it ?
> >
> >> If I can make pretimeout merged, may be you can try pretimeout to
> >> implement early_timeout_sec function?
> >
> >
> > Not sure how one would or even could do that.
> >
> > Do you mean "implement early_pretimeout_sec", by any chance ?
> 
> I mean: using pretimeout to implement the function you want, instead
> of early_pretimeout_sec
> 
How would this work if the watchdog hardware doesn't support pretimeout ?

Pretimeout and early timeout are two logically different functions, with
different goals, so I don't entirely (if at all) understand why it would
make sense to tie them together.

Can you elaborate why you think this would be a good idea ?

Thanks,
Guenter
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