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Date: Mon, 14 Jun 2010 15:34:25 +0200 (CEST)
From: Thomas Gleixner <tglx@linutronix.de>
To: Will Schmidt <will_schmidt@vnet.ibm.com>
cc: LKML <linux-kernel@vger.kernel.org>,
       rt-users <linux-rt-users@vger.kernel.org>,
       John Stultz <johnstul@us.ibm.com>, Nick Piggin <npiggin@suse.de>
Subject: Re: [ANNOUNCE] 2.6.33.5-rt23
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On Thu, 10 Jun 2010, Will Schmidt wrote:

> On Thu, 2010-06-10 at 08:07 +0200, Thomas Gleixner wrote:
> > On Wed, 9 Jun 2010, Will Schmidt wrote:
> > 
> > > On Wed, 2010-06-09 at 18:44 +0200, Thomas Gleixner wrote:
> > > I'm still on 2.6.33.5-rt22 on powerpc, and have run into a couple
> > > "sleeping function called from invalid context..." BUGs.   The first was
> > > during system boot, second during a 'make'.
> > > 
> > > relevant code paths don't seem to have changed between -rt22 and -rt23,
> > > so I think still valid.. :-)  
> > > 
> > > This is on a POWER7 system, which may have opened up some timing
> > > windows, wrt previous runs on POWER6 systems.
> > > 
> > > 
> > > BUG: sleeping function called from invalid context at
> > > kernel/rtmutex.c:684
> > 
> > > [c000000078cf2cf0] [c000000000131a04] .irq_to_desc_alloc_node+0xdc/0x2b8
> > 
> > Grr. I thought I had the SPARSE_IRQ stuff disabled on -rt, but seems
> > it came back somehow. Can you disable that, or does you machine depend
> > on it ?
> 
> I'm not sure whether it is required by the architecture.  I do see that
> SPARSE_IRQ is disabled in arch/x86/Kconfig with a !PREEMPT_RT, but I
> don't see an equivalent 'disable' in arch/powerpc/Kconfig.  

Can you disable it ?

Thanks,

	tglx