linux-kernel - Re: [PATCH 1/5] leds: triggers: Allow to switch the trigger to "panic" on a kernel panic

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Message-ID: <CAAEAJfCnMMHc7yLf7fPCRUw7e4LAASJYLjE-vLwTU_KPLax3zg@mail.gmail.com>
Date:	Wed, 27 Apr 2016 17:10:35 -0300
From:	Ezequiel Garcia <ezequiel@...guardiasur.com.ar>
To:	Jacek Anaszewski <j.anaszewski@...sung.com>
Cc:	Pavel Machek <pavel@....cz>,
	Linux LED Subsystem <linux-leds@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
	Richard Purdie <rpurdie@...ys.net>
Subject: Re: [PATCH 1/5] leds: triggers: Allow to switch the trigger to
 "panic" on a kernel panic

On 26 April 2016 at 04:15, Jacek Anaszewski <j.anaszewski@...sung.com> wrote:
> Hi Ezequiel,
>
> On 04/25/2016 06:27 PM, Ezequiel Garcia wrote:
>>
>> On 25 April 2016 at 03:56, Jacek Anaszewski <j.anaszewski@...sung.com>
>> wrote:
>>>
>>> On 04/24/2016 11:29 AM, Pavel Machek wrote:
>>>>
>>>>
>>>> On Sun 2016-04-24 11:25:51, Pavel Machek wrote:
>>>>>
>>>>>
>>>>> On Mon 2016-04-04 17:22:02, Ezequiel Garcia wrote:
>>>>>>
>>>>>>
>>>>>> This commit adds a new led_cdev flag LED_BLINK_AT_PANIC, which
>>>>>> allows to mark a specific LED to be switched to the "panic"
>>>>>> trigger, on a kernel panic.
>>>>>>
>>>>>> This is useful to allow the user to assign a regular trigger
>>>>>> to a given LED, and still blink that LED on a kernel panic.
>>>>>>
>>>>>> Signed-off-by: Ezequiel Garcia <ezequiel@...guardiasur.com.ar>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>>    drivers/leds/led-triggers.c | 52
>>>>>> +++++++++++++++++++++++++++++++++++++++++++++
>>>>>>    include/linux/leds.h        |  1 +
>>>>>
>>>>>
>>>>>
>>>>> Could we get this out of the core? I'm pretty sure most users are not
>>>>> interested...
>>>
>>>
>>>
>>> Good point.
>>>
>>
>> Not sure how we can get it out of the core, and still implement it.
>>
>> The goal is to run-time switch user-specified LEDs and blink them when
>> the kernel panics, and so it needs to mess up with some core private
>> structures.
>>
>> Unless we don't want this feature at all.
>>
>
> It seems that the entire added code can be easily moved to a separate
> module, let's say led-panic-notifier.c ? It should select
> LEDS_TRIGGER_PANIC, as it would make no sense to have the former enabled
> without the latter.
>

OK, let me try that.
-- 
Ezequiel García, VanguardiaSur
www.vanguardiasur.com.ar