linux-kernel - Re: [PATCH 3/4] watchdog: Split up config options

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Date:   Thu, 15 Jun 2017 10:14:51 -0500
From:   Babu Moger <babu.moger@...cle.com>
To:     Nicholas Piggin <npiggin@...il.com>
Cc:     Don Zickus <dzickus@...hat.com>, linux-kernel@...r.kernel.org,
        linux-arch@...r.kernel.org
Subject: Re: [PATCH 3/4] watchdog: Split up config options

Nick,

On 6/14/2017 10:04 PM, Nicholas Piggin wrote:
> On Wed, 14 Jun 2017 21:16:04 -0500
> Babu Moger <babu.moger@...cle.com> wrote:
>
>> Hi Don,
>>
>> On 6/14/2017 9:09 AM, Don Zickus wrote:
>>> On Wed, Jun 14, 2017 at 02:11:18AM +1000, Nicholas Piggin wrote:
>>>>> Yeah, if you wouldn't mind.  Sorry for dragging this out, but I feel like we
>>>>> are getting close to have this defined properly which would allow us to
>>>>> split the code up correctly in the future.
>>>> How's this for a replacement patch 3? I think the Kconfig works out much
>>>> better now.
>>> Hi Nick,
>>>
>>> I think you made this much clearer, thank you!  I am good with this.
>>>
>>>
>>> Hi Babu,
>>>
>>> Can you give this patchset (and particularly this version of patch 3) a try
>>> on sparc to make sure we didn't break anything?  I believe this should
>>> resolve the start nmi watchdog on boot issue you noticed.  Thanks!
>> There is still one problem with the patch.
>>
>> # cat /proc/sys/kernel/watchdog
>> 1
>> # cat /proc/sys/kernel/nmi_watchdog
>> 0
>>
>> Problem is setting the initial value for  "nmi_watchdog"
>>
>> We need something(or similar) patch on top to address this.
>> ============================================
>> diff --git a/kernel/watchdog.c b/kernel/watchdog.c
>> index 5397c63..0105856 100644
>> --- a/kernel/watchdog.c
>> +++ b/kernel/watchdog.c
>> @@ -34,9 +34,13 @@
>>
>>    int __read_mostly nmi_watchdog_enabled;
>>
>> -#ifdef CONFIG_HARDLOCKUP_DETECTOR
>> +#if defined(CONFIG_HARDLOCKUP_DETECTOR) ||
>> defined(CONFIG_HAVE_NMI_WATCHDOG)
>>    unsigned long __read_mostly watchdog_enabled =
>> SOFT_WATCHDOG_ENABLED|NMI_WATCHDOG_ENABLED;
>> +#else
>> +unsigned long __read_mostly watchdog_enabled = SOFT_WATCHDOG_ENABLED;
>> +#endif
>>
>> +#ifdef CONFIG_HARDLOCKUP_DETECTOR
>>    /* boot commands */
>>    /*
>>     * Should we panic when a soft-lockup or hard-lockup occurs:
>> @@ -69,9 +73,6 @@ static int __init hardlockup_panic_setup(char *str)
>>           return 1;
>>    }
>>    __setup("nmi_watchdog=", hardlockup_panic_setup);
>> -
>> -#else
>> -unsigned long __read_mostly watchdog_enabled = SOFT_WATCHDOG_ENABLED;
>>    #endif
>>
>>    #ifdef CONFIG_SOFTLOCKUP_DETECTOR
> Hmm, I guess I missed this because sparc parses nmi_watchdog=, but it
> also relies on the watchdog_enabled value.
>
> I guess I can fold your incremental patch in. I hope we could get
  Sure. Please go ahead.
> sparc quickly to adopt the complate HAVE_HARDLOCKUP_DETECTOR_ARCH soon
> afterwards though, so we only have 2 cases -- complete hardlockup
Sure. Sounds good. Will look at it later.
> detector, or the very bare minimum NMI_WATCHDOG.
>
> Thanks,
> Nick