linux-kernel - [PATCH] IRQ: Check for PERCPU flag only when adding first irqaction.

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Message-ID: <20070326191455.GA21991@Ahmed>
Date:	Mon, 26 Mar 2007 21:14:55 +0200
From:	"Ahmed S. Darwish" <darwish.07@...il.com>
To:	linux-kernel@...r.kernel.org
Subject: [PATCH] IRQ: Check for PERCPU flag only when adding first irqaction.

Hi,

An irqaction structure won't be added to the IRQ line irqaction list if they
don't agree wrt the IRQF_PERCPU flag. Only check and set this flag in IRQ
descriptor `status' field when the first irqaction is added to the line list.


Signed-off-by: Ahmed S. Darwish <darwish.07@...il.com>
---

Patch over 2.6.21-rc5.

diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
index 5597c15..ea82a54 100644
--- a/kernel/irq/manage.c
+++ b/kernel/irq/manage.c
@@ -317,10 +317,7 @@ int setup_irq(unsigned int irq, struct irqaction *new)
 	}
 
 	*p = new;
-#if defined(CONFIG_IRQ_PER_CPU)
-	if (new->flags & IRQF_PERCPU)
-		desc->status |= IRQ_PER_CPU;
-#endif
+
 	/* Exclude IRQ from balancing */
 	if (new->flags & IRQF_NOBALANCING)
 		desc->status |= IRQ_NO_BALANCING;
@@ -328,6 +325,11 @@ int setup_irq(unsigned int irq, struct irqaction *new)
 	if (!shared) {
 		irq_chip_set_defaults(desc->chip);
 
+#if defined(CONFIG_IRQ_PER_CPU)
+		if (new->flags & IRQF_PERCPU)
+			desc->status |= IRQ_PER_CPU;
+#endif
+		
 		/* Setup the type (level, edge polarity) if configured: */
 		if (new->flags & IRQF_TRIGGER_MASK) {
 			if (desc->chip && desc->chip->set_type)

-- 
Ahmed S. Darwish
http://darwish.07.googlepages.com
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