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

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Message-ID: <19f34abd0808311053m2fbaa711j5bfc846d81cf34b4@mail.gmail.com>
Date:	Sun, 31 Aug 2008 19:53:32 +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 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?


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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