linux-kernel - Re: [PATCH] time/cpuidle:Fixup fallout from hrtimer broadcast mode inclusion

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Date:	Sun, 09 Feb 2014 15:34:31 +0530
From:	Preeti U Murthy <preeti@...ux.vnet.ibm.com>
To:	David Rientjes <rientjes@...gle.com>
CC:	tglx@...utronix.de, fengguang.wu@...el.com, mingo@...nel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] time/cpuidle:Fixup fallout from hrtimer broadcast mode
 inclusion

Hi David,

I have sent out a revised patch on
https://lkml.org/lkml/2014/2/9/2. Can you let me
know if this works for you?

Thanks

Regards
Preeti U Murthy

On 02/09/2014 01:01 PM, David Rientjes wrote:
> On Fri, 7 Feb 2014, Preeti U Murthy wrote:
> 
>> The broadcast timer registration has to be done only when
>> GENERIC_CLOCKEVENTS_BROADCAST and TICK_ONESHOT config options are enabled.
>> Also fix max_delta_ticks value for the pseudo clock device.
>>
>> Reported-by: Fengguang Wu <fengguang.wu@...el.com>
>> Signed-off-by: Preeti U Murthy <preeti@...ux.vnet.ibm.com>
>> Cc: Thomas Gleixner <tglx@...utronix.de>
>> Cc: Ingo Molnar <mingo@...nel.org>
>> ---
>>
>>  kernel/time/tick-broadcast-hrtimer.c |    4 +++-
>>  1 file changed, 3 insertions(+), 1 deletion(-)
>>
>> diff --git a/kernel/time/tick-broadcast-hrtimer.c b/kernel/time/tick-broadcast-hrtimer.c
>> index 5591aaa..bc383ac 100644
>> --- a/kernel/time/tick-broadcast-hrtimer.c
>> +++ b/kernel/time/tick-broadcast-hrtimer.c
>> @@ -81,7 +81,7 @@ static struct clock_event_device ce_broadcast_hrtimer = {
>>  	.min_delta_ns		= 1,
>>  	.max_delta_ns		= KTIME_MAX,
>>  	.min_delta_ticks	= 1,
>> -	.max_delta_ticks	= KTIME_MAX,
>> +	.max_delta_ticks	= ULONG_MAX,
>>  	.mult			= 1,
>>  	.shift			= 0,
>>  	.cpumask		= cpu_all_mask,
>> @@ -102,9 +102,11 @@ static enum hrtimer_restart bc_handler(struct hrtimer *t)
>>  	return HRTIMER_RESTART;
>>  }
>>  
>> +#if defined(CONFIG_GENERIC_CLOCKEVENTS_BROADCAST) && defined(CONFIG_TICK_ONESHOT)
>>  void tick_setup_hrtimer_broadcast(void)
>>  {
>>  	hrtimer_init(&bctimer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS);
>>  	bctimer.function = bc_handler;
>>  	clockevents_register_device(&ce_broadcast_hrtimer);
>>  }
>> +#endif
> 
> I see a build error in timers/core today:
> 
> kernel/time/tick-broadcast-hrtimer.c:101:6: error: redefinition of 'tick_setup_hrtimer_broadcast'
> include/linux/clockchips.h:194:20: note: previous definition of 'tick_setup_hrtimer_broadcast' was here
> 
> and I assume this is the intended fix for that, although it isn't 
> mentioned in the changelog.
> 
> After it's applied, this is left over:
> 
> kernel/time/tick-broadcast-hrtimer.c:91:29: warning: ‘bc_handler’ defined but not used [-Wunused-function]
> 

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