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 12:11:19 -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.

From: ebiederm@...ssion.com [mailto:ebiederm@...ssion.com] 
>> How about let apic_hangle_pending_vector take the irq too?

>We can't compute the vector by reading the hardware registers after
>we have acknowledged the irq.

>I hope that was the answer you were looking for I'm not quite certain
>what you mean by take.

I mean 


+static void apic_handle_pending_vector(unsigned vector)
+{
+	unsigned irr;
+	int irq;
+
+	irq = __get_cpu_var(vector_irq)[vector];
+	if (irq >= 0)
+		return;
+
+	/* If the irq we are servicing has moved and is not pending
+	 * free it's vector.
+	 */

==>

+static void apic_handle_pending_vector(unsigned vector, unsigned irqx)
+{
+	unsigned irr;
+	int irq;
+
+	irq = __get_cpu_var(vector_irq)[vector];
+	if ( (-irq) != irqx)
+		return;
+ 
+
+	/* If the irq we are servicing has moved and is not pending
+	 * free it's vector.
+	 */



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