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

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Message-ID: <CADyBb7uULCn97ea19zH8dB4QX1QA8=AXL94d6gXgFxXM8haBNA@mail.gmail.com>
Date:	Thu, 4 Feb 2016 02:18:38 +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@....com
Subject: Re: [PATCH v10 5/5] Watchdog: ARM SBSA Generic Watchdog half timeout
 panic support

On 4 February 2016 at 02:08, Timur Tabi <timur@...eaurora.org> wrote:
> Fu Wei wrote:
>>
>> Actually I am taking your suggestion to avoid touching WCV in
>> interrupt routine.
>> So even we have pre-timeout support , it is useless for this
>> panic-on-half-timeout feature,
>> because pre-timeout  == timeout / 2 (always).
>>
>> So maybe I misunderstand your suggestion,
>> could you let me know : why we want pre-timeout here?
>
>
> Maybe I'm confused.
>
> For pre-timeout, I think the SBSA watchdog driver should support only
> half-timeout.  That is, the user cannot configure the length of the
> pre-timeout with this driver.  He can only enable it, and it is
> automatically set to 1/2 timeout.

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.

>
> So "pre-timeout  == timeout / 2 (always)" is exactly what we want.

our patchset is doing this way.



-- 
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,
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