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

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Date:	Sun, 31 Aug 2008 21:08:34 +0200
From:	"Vegard Nossum" <vegard.nossum@...il.com>
To:	paulmck@...ux.vnet.ibm.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 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!


Vegard

-- 
"The animistic metaphor of the bug that maliciously sneaked in while
the programmer was not looking is intellectually dishonest as it
disguises that the error is the programmer's own creation."
	-- E. W. Dijkstra, EWD1036
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