linux-kernel - Re: Possible regression due to "hrtimer: Get rid of hrtimer softirq"

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Message-ID: <7hvbg3gfeb.fsf@deeprootsystems.com>
Date:	Fri, 08 May 2015 10:14:52 -0700
From:	Kevin Hilman <khilman@...nel.org>
To:	Simon Horman <horms@...ge.net.au>
Cc:	Thomas Gleixner <tglx@...utronix.de>, linux-sh@...r.kernel.org,
	Peter Zijlstra <peterz@...radead.org>,
	Magnus Damm <magnus.damm@...il.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...nel.org>,
	LAK <linux-arm-kernel@...ts.infradead.org>
Subject: Re: Possible regression due to "hrtimer: Get rid of hrtimer softirq"

Simon Horman <horms@...ge.net.au> writes:

> Hi Thomas,
>
> On Thu, May 07, 2015 at 02:35:59PM +0200, Thomas Gleixner wrote:
>> On Thu, 7 May 2015, Simon Horman wrote:
>> > ------------[ cut here ]------------
>> > kernel BUG at kernel/irq_work.c:135!
>> 
>>   BUG_ON(!irqs_disabled());
>> 
>> So something enables interrupts in the periodic tick handling
>> machinery. Seems you have high resolution timers disabled, but nohz
>> enabled. And that code path has a local_irq_disable/enable pair which
>> causes havoc. Patch below.
>
> Thanks for your quick response. I have been able to confirm that
> when applied on top of next-20150507 the problem I observed no longer
> manifests. I have successfully tested it on all the boards
> where I previously observed a problem.
>
> If you are planning to formally submit the patch below feel free to add:
>
> Tested-by: Simon Horman <horms+renesas@...ge.net.au>

FWIW, I confirmed this fixed a boot hang on my kzm9d in next-20150507
also.

Tested-by: Kevin Hilman <khilman@...aro.org>
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