[PATCH v10 5/5] Watchdog: ARM SBSA Generic Watchdog half timeout panic support

[Fu Wei]

Hi Guenter,

On 4 February 2016 at 13:17, Guenter Roeck <linux at roeck-us.net> wrote:
> On 02/03/2016 03:00 PM, Fu Wei wrote:
>>
>> On 4 February 2016 at 02:45, Timur Tabi <timur at 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

>
> I am not too happy with the parameter name (panic_enabled). How about
> "action", to match machzwd ?

yes, makes sense. Maybe we can do something  like this:

/*
 * action refers to action taken when watchdog gets WS0
 * 0 = SKIP
 * 1 = PANIC
 * defaults to SKIP (0)
 */
static int action;
module_param(action, int, 0);
MODULE_PARM_DESC(action, "after watchdog gets WS0 interrupt, do: "
"0 = SKIP(*)  1 = PANIC");


>
> Thanks,
> Guenter
>



-- 
Best regards,

Fu Wei
Software Engineer
Red Hat Software (Beijing) Co.,Ltd.Shanghai Branch
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