linux-kernel - Re: Possible regression due to "tick: broadcast: Prevent livelock from event handler"

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Message-ID: <20150703114129.GA10368@katana>
Date:	Fri, 3 Jul 2015 13:41:29 +0200
From:	Wolfram Sang <wsa@...-dreams.de>
To:	Russell King - ARM Linux <linux@....linux.org.uk>
Cc:	Simon Horman <horms@...ge.net.au>,
	Geert Uytterhoeven <geert+renesas@...der.be>,
	Kevin Hilman <khilman@...nel.org>,
	Tyler Baker <tyler.baker@...aro.org>, linux-sh@...r.kernel.org,
	Magnus Damm <magnus.damm@...il.com>,
	linux-kernel@...r.kernel.org, Borislav Petkov <bp@...en8.de>,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: Possible regression due to "tick: broadcast: Prevent livelock
 from event handler"

On Fri, Jul 03, 2015 at 12:13:58PM +0100, Russell King - ARM Linux wrote:
> On Fri, Jul 03, 2015 at 01:07:31PM +0200, Wolfram Sang wrote:
> > > Please share your .config file for this case.  Thanks.
> > 
> > Here it goes...
> 
> Please try:
> 
> sed -i s/IRQSOFF_TRACER/TRACE_IRQFLAGS/ arch/arm/kernel/entry-armv.S

Yes, this fixes the lockdep issue with HRTIMERS.

For completeness, it does not fix the freeze without HRTIMERS.

Thanks Russell!

Tested-by: Wolfram Sang <wsa+renesas@...g-engineering.com>


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