From: Guenter Roeck <linux@roeck-us.net>
To: Fu Wei <fu.wei@linaro.org>
Cc: "Timur Tabi" <timur@codeaurora.org>,
"Rob Herring" <robh+dt@kernel.org>,
"Paweł Moll" <pawel.moll@arm.com>,
"Mark Rutland" <mark.rutland@arm.com>,
"Ian Campbell" <ijc+devicetree@hellion.org.uk>,
"Kumar Gala" <galak@codeaurora.org>,
"Wim Van Sebroeck" <wim@iguana.be>, "Jon Corbet" <corbet@lwn.net>,
"Catalin Marinas" <catalin.marinas@arm.com>,
"Will Deacon" <will.deacon@arm.com>,
"Suravee Suthikulpanit" <Suravee.Suthikulpanit@amd.com>,
LKML <linux-kernel@vger.kernel.org>,
linux-watchdog@vger.kernel.org, linux-doc@vger.kernel.org,
devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
"Linaro ACPI Mailman List" <linaro-acpi@lists.linaro.org>,
rruigrok@codeaurora.org, "Abdulhamid,
Harb" <harba@codeaurora.org>,
"Christopher Covington" <cov@codeaurora.org>,
"Dave Young" <dyoung@redhat.com>,
"Pratyush Anand" <panand@redhat.com>,
"G Gregory" <graeme.gregory@linaro.org>,
"Al Stone" <al.stone@linaro.org>,
"Hanjun Guo" <hanjun.guo@linaro.org>,
"Jon Masters" <jcm@redhat.com>, "Arnd Bergmann" <arnd@arndb.de>,
"Leo Duran" <leo.duran@amd.com>,
"Sudeep Holla" <sudeep.holla@arm.com>
Subject: Re: [PATCH v10 5/5] Watchdog: ARM SBSA Generic Watchdog half timeout panic support
Date: Fri, 5 Feb 2016 15:54:37 -0800 [thread overview]
Message-ID: <56B5363D.20200@roeck-us.net> (raw)
In-Reply-To: <CADyBb7sP=d+BWOdmNEAs38yRcmXVjYsFX=XNffNpGqfybpxTfQ@mail.gmail.com>
On 02/05/2016 10:21 AM, Fu Wei wrote:
> On 5 February 2016 at 22:42, Guenter Roeck <linux@roeck-us.net> wrote:
>> On 02/05/2016 01:51 AM, Fu Wei wrote:
>>>
>>> Hi Guenter,
>>>
>>> On 4 February 2016 at 13:17, Guenter Roeck <linux@roeck-us.net> wrote:
>>>>
>>>> On 02/03/2016 03:00 PM, Fu Wei wrote:
>>>>>
>>>>>
>>>>> On 4 February 2016 at 02:45, Timur Tabi <timur@codeaurora.org> wrote:
>>>>>>
>>>>>>
>>>>>> Fu Wei wrote:
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>> 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.
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>> Ok, I think patches 4 and 5 should be combined, and I think the Kconfig
>>>>>> entry should be removed and just use panic_enabled.
>>>>
>>>>
>>>>
>>>> Agreed.
>>>
>>>
>>> np, will do
>>>
>>>>>
>>>>>
>>>>> NP, will update this patchset like that , thanks :-)
>>>>>
>>>>
>>>> Also, if panic is enabled, the timeout needs to be adjusted accordingly
>>>> (to only panic after the entire timeout period has expired, not after
>>>> half of it). We can not panic the system after timeout / 2.
>>>
>>>
>>> OK, my thought is
>>>
>>> if panic is enabled :
>>> |--------WOR-------WS0--------WOR-------WS1
>>> |------timeout------(panic)------timeout-----reset
>>>
>>> if panic is disabled .
>>> |--------WOR-------WS0--------WOR-------WS1
>>> |---------------------timeout---------------------reset
>>>
>>> panic_enabled only can be configured when module is loaded by module
>>> parameter
>>>
>>> But user should know that max_timeout(panic_enable) =
>>> max_timeout(panic_disable) / 2
>>>
>>
>> That means you'll have to update max_timeout accordingly.
>
> panic_enabled only can be configured when module is loaded, so we
> don't need to update it.
>
> max_timeout will only be set up in the init stage.
>
> Does it make sense ? :-)
>
Not sure I understand your problem or question.
max_timeout will have to reflect the correct maximum timeout, under
all circumstances. It will have to be set to the correct value before
the watchdog driver is registered.
Guenter
next prev parent reply other threads:[~2016-02-05 23:54 UTC|newest]
Thread overview: 46+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-02-03 17:18 [PATCH v10 0/5] Watchdog: introduce ARM SBSA watchdog driver fu.wei
2016-02-03 17:18 ` [PATCH v10 1/5] Documentation: add sbsa-gwdt driver documentation fu.wei
2016-02-03 17:18 ` [PATCH v10 2/5] ARM64: add SBSA Generic Watchdog device node in foundation-v8.dts fu.wei
2016-02-03 17:18 ` [PATCH v10 3/5] ARM64: add SBSA Generic Watchdog device node in amd-seattle-soc.dtsi fu.wei
2016-02-03 17:18 ` [PATCH v10 4/5] Watchdog: introduce ARM SBSA watchdog driver fu.wei
2016-02-03 17:48 ` Timur Tabi
2016-02-03 17:57 ` Fu Wei
2016-02-03 17:58 ` Timur Tabi
2016-02-03 18:09 ` Fu Wei
2016-02-03 18:12 ` Timur Tabi
2016-02-04 16:25 ` Mathieu Poirier
2016-02-05 9:01 ` Fu Wei
2016-02-04 16:31 ` Will Deacon
2016-02-04 16:37 ` Timur Tabi
2016-02-04 16:46 ` Guenter Roeck
2016-02-05 8:52 ` Fu Wei
2016-02-03 17:18 ` [PATCH v10 5/5] Watchdog: ARM SBSA Generic Watchdog half timeout panic support fu.wei
2016-02-03 17:27 ` Timur Tabi
2016-02-03 17:49 ` Fu Wei
2016-02-03 17:53 ` Timur Tabi
2016-02-03 18:06 ` Fu Wei
2016-02-03 18:08 ` Timur Tabi
2016-02-03 18:18 ` Fu Wei
2016-02-03 18:26 ` Timur Tabi
2016-02-03 18:37 ` Fu Wei
2016-02-03 18:45 ` Timur Tabi
2016-02-03 23:00 ` Fu Wei
2016-02-04 5:17 ` Guenter Roeck
2016-02-04 13:48 ` Timur Tabi
2016-02-04 14:41 ` Guenter Roeck
2016-02-05 9:51 ` Fu Wei
2016-02-05 13:02 ` Thomas Petazzoni
2016-02-05 13:08 ` Timur Tabi
2016-02-05 13:33 ` Thomas Petazzoni
2016-02-05 14:42 ` Guenter Roeck
2016-02-05 18:21 ` Fu Wei
2016-02-05 23:54 ` Guenter Roeck [this message]
2016-02-06 18:02 ` Fu Wei
2016-02-06 18:55 ` Timur Tabi
2016-02-07 2:02 ` Fu Wei
2016-02-06 18:57 ` Guenter Roeck
2016-02-07 2:12 ` Fu Wei
2016-02-04 16:32 ` Mathieu Poirier
2016-02-04 16:41 ` Guenter Roeck
2016-02-04 16:43 ` Timur Tabi
2016-02-05 9:20 ` Fu Wei
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