IRQ: check for PERCPU flag only when adding first irqaction

An irqaction structure won't be added to an IRQ descriptor irqaction list if
it doesn't agree with other irqactions on the IRQF_PERCPU flag.  Don't check
for this flag to change IRQ descriptor `status' for every irqaction added to
the list, Doing the check only for the first irqaction added is enough.

Signed-off-by: Ahmed S. Darwish <darwish.07@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

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)