On 02/05/2016 10:21 AM, Fu Wei wrote:

On 5 February 2016 at 22:42, Guenter Roeck [off-list ref] wrote:

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On 02/05/2016 01:51 AM, Fu Wei wrote:

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Hi Guenter,

On 4 February 2016 at 13:17, Guenter Roeck [off-list ref] wrote:

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On 02/03/2016 03:00 PM, Fu Wei wrote:

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On 4 February 2016 at 02:45, Timur Tabi [off-list ref] wrote:

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Fu Wei wrote:

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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

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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