linux-kernel - Re: [PATCH 45/79] [PATCH] fix apic acking of irqs

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Message-ID: <87k5jrgenq.fsf@basil.nowhere.org>
Date:	25 Mar 2008 13:40:41 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	"Maciej W. Rozycki" <macro@...ux-mips.org>
Cc:	Glauber Costa <gcosta@...hat.com>, linux-kernel@...r.kernel.org,
	akpm@...ux-foundation.org, tglx@...utronix.de, mingo@...e.hu,
	ak@...e.de
Subject: Re: [PATCH 45/79] [PATCH] fix apic acking of irqs

"Maciej W. Rozycki" <macro@...ux-mips.org> writes:
> 
>  Please note that ESR may hold some leftover state from whatever happened 
> before Linux has taken control, so it is reasonable and I think actually 
> recommended by Intel (FWIW) to clear the register before enabling the 
> error interrupt.  For how to clear the ESR properly, please see 
> setup_local_APIC() -- subtle differences and errata in various APIC 
> implementations have made it more complicated than necessary, sigh...

iirc a lot of the ESR weirdness was on NUMAQ only, which is down to one 
of two last machines running Linux which will hopefully die soon ...

-Andi

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