linux-kernel - Re: [PATCH] x86, clocksource, fix !CONFIG_CLOCKSOURCE

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Date:	Mon, 27 May 2013 10:37:39 -0400
From:	Prarit Bhargava <prarit@...hat.com>
To:	Thomas Gleixner <tglx@...utronix.de>
CC:	linux-kernel@...r.kernel.org, John Stultz <john.stultz@...aro.org>,
	x86@...nel.org
Subject: Re: [PATCH] x86, clocksource, fix !CONFIG_CLOCKSOURCE_WATCHDOG compile



On 05/27/2013 06:00 AM, Thomas Gleixner wrote:
> On Fri, 22 Feb 2013, Prarit Bhargava wrote:
> 
>> If I explicitly disable the clocksource watchdog in the x86 Kconfig,
> 
> And why do you want to do that?

Hey Thomas, I was debugging something and stumbled across this.

IIRC the issue was that there some weirdness on a series of new AMD systems and
unfortunately the watchdog would fire and switch clocksources on me :(  That
resulted in me not being able to debug the HW because the clocksource I wanted
was no longer available.

P.

> 
>> the x86 kernel will not compile unless this is properly defined.
>>
>> Signed-off-by: Prarit Bhargava <prarit@...hat.com>
>> Cc: John Stultz <john.stultz@...aro.org>
>> Cc: Thomas Gleixner <tglx@...utronix.de>
>> Cc: x86@...nel.org
>> ---
>>  kernel/time/clocksource.c |    1 +
>>  1 file changed, 1 insertion(+)
>>
>> diff --git a/kernel/time/clocksource.c b/kernel/time/clocksource.c
>> index c958338..e04821f 100644
>> --- a/kernel/time/clocksource.c
>> +++ b/kernel/time/clocksource.c
>> @@ -450,6 +450,7 @@ static void clocksource_enqueue_watchdog(struct clocksource *cs)
>>  static inline void clocksource_dequeue_watchdog(struct clocksource *cs) { }
>>  static inline void clocksource_resume_watchdog(void) { }
>>  static inline int clocksource_watchdog_kthread(void *data) { return 0; }
>> +void clocksource_mark_unstable(struct clocksource *cs) { }
>>  
>>  #endif /* CONFIG_CLOCKSOURCE_WATCHDOG */
>>  
>> -- 
>> 1.7.9.3
>>
>>
--
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