linux-kernel - Re: [patch] x86, apic: use 0x20 for the IRQ_MOVE_CLEANUP

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Message-ID: <20100112102548.4de56c14@lxorguk.ukuu.org.uk>
Date:	Tue, 12 Jan 2010 10:25:48 +0000
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Suresh Siddha <suresh.b.siddha@...el.com>,
	Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	Yinghai Lu <yinghai@...nel.org>,
	"Maciej W. Rozycki" <macro@...ux-mips.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [patch] x86, apic: use 0x20 for the IRQ_MOVE_CLEANUP_VECTOR
 instead of 0x1f

> I'm wondering if what you're thinking of are the really old LAPICs which
> could only remember two pending interrupts per priority level?

On the really old boards an IPI can arrive more than once which makes
synchronization questions all the more interesting !

Alan
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