linux-kernel - Re: [PATCH v10 5/5] Watchdog: ARM SBSA Generic Watchdog half timeout panic support

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Message-ID: <CADyBb7s_QeU=pYqN9G+5WMtx-L+=QC6uZR6N6ZWPOixnkHzPjw@mail.gmail.com>
Date:	Thu, 4 Feb 2016 02:37:14 +0800
From:	Fu Wei <fu.wei@...aro.org>
To:	Timur Tabi <timur@...eaurora.org>
Cc:	Rob Herring <robh+dt@...nel.org>,
	Paweł Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Wim Van Sebroeck <wim@...ana.be>,
	Guenter Roeck <linux@...ck-us.net>,
	Jon Corbet <corbet@....net>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will.deacon@....com>,
	Suravee Suthikulpanit <Suravee.Suthikulpanit@....com>,
	LKML <linux-kernel@...r.kernel.org>,
	linux-watchdog@...r.kernel.org, linux-doc@...r.kernel.org,
	devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	Linaro ACPI Mailman List <linaro-acpi@...ts.linaro.org>,
	rruigrok@...eaurora.org, "Abdulhamid, Harb" <harba@...eaurora.org>,
	Christopher Covington <cov@...eaurora.org>,
	Dave Young <dyoung@...hat.com>,
	Pratyush Anand <panand@...hat.com>,
	G Gregory <graeme.gregory@...aro.org>,
	Al Stone <al.stone@...aro.org>,
	Hanjun Guo <hanjun.guo@...aro.org>,
	Jon Masters <jcm@...hat.com>, Arnd Bergmann <arnd@...db.de>,
	Leo Duran <leo.duran@....com>,
	Sudeep Holla <sudeep.holla@....com>
Subject: Re: [PATCH v10 5/5] Watchdog: ARM SBSA Generic Watchdog half timeout
 panic support

On 4 February 2016 at 02:26, Timur Tabi <timur@...eaurora.org> wrote:
> Fu Wei wrote:
>>
>> Actually,
>> the SBSA watchdog driver should support only  half-timeout for panic
>> the user cannot configure the length of "panic time",  He can only
>> enable it, and it is automatically set to 1/2 timeout.
>>
>> we don't need pre-timeout here.
>>
>> Hope I understand you correctly:-)  sorry for your confusion
>>
>>> >
>>> >So when pre-timeout occurs, the interrupt handler calls panic() or
>>> > whatever
>>> >it's supposed to do.
>>
>> Actually,
>> So when 1/2 timeout occurs, the interrupt handler calls panic() or
>> whatever it's supposed to do.
>>
>
> I understand all that.  What I'm saying is that, in the future, when
> pre-timeout support is added to the watchdog layer, I think it makes sense
> to modify this driver to use pre-timeout support.

As you know I have made the pre-timeout support patch, If people like
it, i am happy to go on upstream it separately.

If we want to use pre-timeout here, user only can use get_pretimeout
and disable panic by setting pretimeout to 0
but user can not really set pretimeout, because "pre-timeout  ==
timeout / 2 (always)".
if user want to change pretimeout, he/she has to set_time instead.




-- 
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)
Room 1512, Regus One Corporate Avenue,Level 15,
One Corporate Avenue,222 Hubin Road,Huangpu District,
Shanghai,China 200021