linux-kernel - Re: Regression in RCU subsystem in latest mainline kernel

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Date:	Mon, 17 Jun 2013 15:21:15 +0200
From:	Rojhalat Ibrahim <imr@...chenk.de>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	paulmck@...ux.vnet.ibm.com, linux-kernel@...r.kernel.org,
	linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>
Subject: Re: Regression in RCU subsystem in latest mainline kernel

On Friday 14 June 2013 22:17:34 Steven Rostedt wrote:
> On Sat, 2013-06-15 at 12:02 +1000, Benjamin Herrenschmidt wrote:
> > On Fri, 2013-06-14 at 17:06 -0400, Steven Rostedt wrote:
> > > I was pretty much able to reproduce this on my PA Semi PPC box. Funny
> > > thing is, when I type on the console, it makes progress. Anyway, it
> > > seems that powerpc has an issue with irq_work(). I'll try to get some
> > > time either tonight or next week to figure it out.
> > 
> > Does this help ?
> 
> It did for me. Rojhalat, did this fix your issue too?
> 

FWIW, since the fix is already applied, but it fixes my problem too.

   Rojhalat


> -- Steve
> 
> > diff --git a/arch/powerpc/kernel/irq.c b/arch/powerpc/kernel/irq.c
> > index 5cbcf4d..ea185e0 100644
> > --- a/arch/powerpc/kernel/irq.c
> > +++ b/arch/powerpc/kernel/irq.c
> > @@ -162,7 +162,7 @@ notrace unsigned int __check_irq_replay(void)
> > 
> >  	 * in case we also had a rollover while hard disabled
> >  	 */
> >  	
> >  	local_paca->irq_happened &= ~PACA_IRQ_DEC;
> > 
> > -	if (decrementer_check_overflow())
> > +	if ((happened & PACA_IRQ_DEC) || decrementer_check_overflow())
> > 
> >  		return 0x900;
> >  	
> >  	/* Finally check if an external interrupt happened */
> > 
> > Cheers,
> > Ben.
--
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