linux-kernel - RE: [PATCH 2/2] x86_64 irq: Handle irqs pending in IRR during irq migration.

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Date:	Mon, 5 Feb 2007 12:54:13 -0800
From:	"Lu, Yinghai" <yinghai.lu@....com>
To:	ebiederm@...ssion.com
cc:	"Andi Kleen" <ak@...e.de>, "Andrew Morton" <akpm@...l.org>,
	linux-kernel@...r.kernel.org,
	"Luigi Genoni" <luigi.genoni@...elli.com>,
	"Ingo Molnar" <mingo@...e.hu>,
	"Natalie Protasevich" <protasnb@...il.com>
Subject: RE: [PATCH 2/2] x86_64 irq: Handle irqs pending in IRR during
 irq migration.

-----Original Message-----
From: ebiederm@...ssion.com [mailto:ebiederm@...ssion.com] 
Sent: Monday, February 05, 2007 12:37 PM


>The only corner case I can see that might potentially happen is
>"apic_in_service_vector() != irq_vector[irq]" and if that is the case
>we don't want to migrate, because the precondition that we are in the
>irq handler servicing the expected irq isn't true.

Reuse vector could help in that case.

In another case, if two irq are migrated from one cpu to another cpu.
ack_apic_edge for irq2 could use get apci_in_servier_vector for irq1,
and handle that to clear irr for irq1. instead of irq2.

YH




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