linux-kernel - Re: [PATCH] prevent ia64 from invoking irq handlers on offline CPUs

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Message-ID: <20080831200833.GJ7015@linux.vnet.ibm.com>
Date:	Sun, 31 Aug 2008 13:08:33 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Vegard Nossum <vegard.nossum@...il.com>
Cc:	linux-kernel@...r.kernel.org, tony.luck@...el.com, jes@....com,
	manfred@...orfullife.com, akpm@...ux-foundation.org
Subject: Re: [PATCH] prevent ia64 from invoking irq handlers on offline CPUs

On Sun, Aug 31, 2008 at 09:08:34PM +0200, Vegard Nossum wrote:
> On Sun, Aug 31, 2008 at 8:06 PM, Paul E. McKenney
> <paulmck@...ux.vnet.ibm.com> wrote:
> > On Sun, Aug 31, 2008 at 07:53:32PM +0200, Vegard Nossum wrote:
> >> On Sun, Aug 31, 2008 at 7:51 PM, Paul E. McKenney
> >> <paulmck@...ux.vnet.ibm.com> wrote:
> >> >> > @@ -751,6 +749,7 @@ int __cpu_disable(void)
> >> >> >        remove_siblinginfo(cpu);
> >> >> >        cpu_clear(cpu, cpu_online_map);
> >>
> >> Here ^^^
> >>
> >> >> >        fixup_irqs();
> >> >> > +       cpu_clear(cpu, cpu_online_map);
> >> >> >        local_flush_tlb_all();
> >> >> >        cpu_clear(cpu, cpu_callin_map);
> >> >> >        return 0;
> >> >>
> >> >> Hm. Maybe my eyes are going bad. But isn't that now clearing the cpu
> >> >> both before and after calling fixup_irqs()?
> >> >
> >> > I don't believe so...  I removed the earlier one and added the later
> >> > one.  Or is there another one hidden somewhere that I missed?
> >>
> >> See marker above. It's not removed, is it?
> >
> > Right you are!!!  There were two to begin with, and I moved the first
> > one only.  The attached updated patch removes the extra one.
> 
> Good, I am not blind yet! (Though I did have to look more than once.)
> 
> On the other hand... Paul; human after all!

Very much so, I am afraid!  ;-)

							Thanx, Paul
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