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

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Date:	Tue, 19 May 2015 09:12:31 +0800
From:	Fu Wei <fu.wei@...aro.org>
To:	Guenter Roeck <linux@...ck-us.net>
Cc:	Arnd Bergmann <arnd@...db.de>,
	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

Hi Arnd, Guenter,

yes, that is brilliant idea!!
I will try to do so , that solve the compatibility problem , so I
guess we can try this time :-)

On 19 May 2015 at 04:14, Guenter Roeck <linux@...ck-us.net> wrote:
> 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



-- 
Best regards,

Fu Wei
Software Engineer
Red Hat Software (Beijing) Co.,Ltd.Shanghai Branch
Ph: +86 21 61221326(direct)
Ph: +86 186 2020 4684 (mobile)
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