Hi Timur
On 4 February 2016 at 01:53, Timur Tabi <timur@xxxxxxxxxxxxxx> wrote:
> Fu Wei wrote:
>>
>> sorry, are you saying : using pre-timeout instead of this half timeout?
>>
>> But even we have pre-timeout support, pre-timeout == timeout / 2, it
>> can not be configured without touch timeout.
>>
>> if you want pre-timeout != timeout / 2, we have to modify WCV in the
>> interrupt routine.
>> (because of the explicit watchdog refresh mechanism)
>>
>> Could you let me know why we need pre-timeout here ??:-)
>
>
> What I meant was that if we had full-blown pre-timeout support in the
> watchdog layer, then you could use that to implement the
> panic-on-half-timeout feature.
>
> When pre-timeout is implemented, will you modify the interrupt handler to
> use it?
Sorry I am little confused.
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?
>
>>> >belong upstream. But like I said, it's just my opinion, and I won't
>>> >complain if I'm outvoted.
>>
>> I think this debugging feature is the purpose of the two-stage
>> watchdog, if I understand correctly
>
>
> Hmmm... that make sense. I think maybe you should drop the Kconfig option,
> and just have "static bool panic_enabled = false;" Also, then do this:
>
> if (panic_enabled) {
> ret = devm_request_irq(dev, irq, sbsa_gwdt_interrupt, 0,
> pdev->name, gwdt);
> if (ret) {
> dev_err(dev, "unable to request IRQ %d\n", irq);
> return ret;
> }
> }
yes, agree
>
> That way, the interrupt handler is never registered if the command-line
> parameter is not specified.
>
--
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
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