linux-kernel - Re: [PATCH 4/6] Watchdog: introdouce "pretimeout" into framework

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Message-ID: <20150518201445.GA21230@roeck-us.net>
Date:	Mon, 18 May 2015 13:14:45 -0700
From:	Guenter Roeck <linux@...ck-us.net>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	Fu Wei <fu.wei@...aro.org>,
	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>,
	vgandhi@...eaurora.org, wim@...ana.be,
	Jon Masters <jcm@...hat.com>, Leo Duran <leo.duran@....com>,
	Jon Corbet <corbet@....net>
Subject: Re: [PATCH 4/6] Watchdog: introdouce "pretimeout" into framework

On Mon, May 18, 2015 at 10:03:52PM +0200, Arnd Bergmann wrote:
> On Monday 18 May 2015 10:23:30 Guenter Roeck wrote:
> > > 
> > > integrate watchdog_init_pretimeout and watchdog_init_timeout will be a
> > > little hard,
> > > we may need to change this API to :
> > > 
> > > watchdog_init_timeouts(struct watchdog_device *wdd, unsigned int timeout_parm,
> > >                              unsigned int pretimeout_parm, struct device *dev)
> > > 
> > > then we need to update all the watchdog drivers which use this API,
> > > maybe we can do this in a individual patchset, after this pretimeout
> > > patch is merged.
> > > 
> > > Is that OK  ?   any thought?
> > > 
> > That is what I would recommend.
> > 
> 
> The API change is fine, but I don't think you need to change all drivers.
> 
> Just add a small wrapper function in the header file doing the conversion:
> 
> static inline int watchdog_init_timeout(struct watchdog_device *wdd,
>                                 unsigned int timeout_parm, struct device *dev)
> {
> 	return watchdog_init_timeouts(wdd, timeout_parm, ~0ul, dev);
> }
> 
> Then you can update the drivers that actually use the pretimeout to
> use the new function at some point, and leave all other drivers calling
> the wrapper function.
> 
Excellent idea.

Guenter
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