linux-kernel - Re: [patch 1/2] tick/broadcast: Prevent deep idle states if no broadcast device available

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Date:	Tue, 07 Jul 2015 12:25:42 +0100
From:	Sudeep Holla <sudeep.holla@....com>
To:	Thomas Gleixner <tglx@...utronix.de>
CC:	Sudeep Holla <sudeep.holla@....com>,
	LKML <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Preeti U Murthy <preeti@...ux.vnet.ibm.com>,
	Suzuki Poulose <Suzuki.Poulose@....com>,
	Lorenzo Pieralisi <Lorenzo.Pieralisi@....com>,
	Catalin Marinas <Catalin.Marinas@....com>,
	"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>
Subject: Re: [patch 1/2] tick/broadcast: Prevent deep idle states if no broadcast
 device available

Hi Thomas,

On 07/07/15 08:31, Thomas Gleixner wrote:
> On Mon, 6 Jul 2015, Thomas Gleixner wrote:
>
>> On Mon, 6 Jul 2015, Sudeep Holla wrote:
>>> This triggered the below crash on boot, looks like it's accessing
>>> hrtimer->function which is null in periodic mode IIUC
>>>
>>> Regards,
>>> Sudeep
>>
>> Gah. I have no idea how that gets queued. /me goes off to tweak x86 to
>> emulate that crap.
>
> So with a less heat damaged brain, I think I was able to decode the
> twisted logic behind all this.
>
> Can you test the patch below please?
>


Yes I tested this patch for all the combinations I had mentioned in my
earlier email. Everything works as expected. Thanks a lot for the
patience. Please feel free to add:

Tested-by: Sudeep Holla <sudeep.holla@....com>

>   {
> Index: tip/kernel/time/tick-broadcast.c
> ===================================================================
> --- tip.orig/kernel/time/tick-broadcast.c
> +++ tip/kernel/time/tick-broadcast.c

> @@ -938,6 +972,16 @@ bool tick_broadcast_oneshot_available(vo
>   	return bc ? bc->features & CLOCK_EVT_FEAT_ONESHOT : false;
>   }
>
> +#else
> +int __tick_broadcast_oneshot_control(enum tick_broadcast_state state)
> +{
> +	struct clock_event_device *bc = tick_broadcast_device.evtdev;
> +
> +	if (!bc || (bc->features & CLOCK_EVT_FEAT_HRTIMER)

missing ')' at the end in the above statement

Regards,
Sudeep
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