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

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Date:	Fri, 7 Feb 2014 18:57:51 +0100 (CET)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Preeti U Murthy <preeti@...ux.vnet.ibm.com>
cc:	fengguang.wu@...el.com, mingo@...nel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] time/cpuidle:Fixup fallout from hrtimer broadcast mode
 inclusion

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.

Then we should compile that file only when those options are
enabled. Where is the point to compile that code w/o the registration
function?

> 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
> 
> 
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