linux-kernel - Re: 2.6.19-rc1 genirq causes either boot hang or "do

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Date:	Fri, 6 Oct 2006 22:42:37 +0200
From:	Muli Ben-Yehuda <muli@...ibm.com>
To:	Andrew Vasquez <andrew.vasquez@...gic.com>
Cc:	Andrew Morton <akpm@...l.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Rajesh Shah <rajesh.shah@...el.com>, Andi Kleen <ak@....de>,
	"Protasevich, Natalie" <Natalie.Protasevich@...SYS.com>,
	"Luck, Tony" <tony.luck@...el.com>,
	Linus Torvalds <torvalds@...l.org>,
	Linux-Kernel <linux-kernel@...r.kernel.org>,
	Badari Pulavarty <pbadari@...il.com>
Subject: Re: 2.6.19-rc1 genirq causes either boot hang or "do_IRQ: cannot handle IRQ -1"

On Fri, Oct 06, 2006 at 01:02:23PM -0700, Andrew Vasquez wrote:

> > diff -puN arch/x86_64/kernel/apic.c~x86_64-irq_regs-fix arch/x86_64/kernel/apic.c
> > --- a/arch/x86_64/kernel/apic.c~x86_64-irq_regs-fix
> > +++ a/arch/x86_64/kernel/apic.c
> > @@ -913,8 +913,10 @@ void smp_local_timer_interrupt(void)
> >   * [ if a single-CPU system runs an SMP kernel then we call the local
> >   *   interrupt as well. Thus we cannot inline the local irq ... ]
> >   */
> > -void smp_apic_timer_interrupt(void)
> > +void smp_apic_timer_interrupt(struct pt_regs *regs)
> >  {
> > +	struct pt_regs *old_regs = set_irq_regs(regs);
> > +
> >  	/*
> >  	 * the NMI deadlock-detector uses this.
> >  	 */
> > @@ -934,6 +936,7 @@ void smp_apic_timer_interrupt(void)
> >  	irq_enter();
> >  	smp_local_timer_interrupt();
> >  	irq_exit();
> > +	set_irq_regs(old_regs);
> >  }
> >  
> >  /*
> 
> Patch appears to work.
> 
> At least I can now boot my x86_64 box.

Patch fixes the profile_tick() problem for me too. I can boot the tip
of the tree now provided I use maxcpus=1 to work around the genirq
bug.

Cheers,
Muli
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