If you get to that point in the code it means that
desc->move_irq is set, pending_irq_cpumask[irq] and cpu_online_map
should have a value. Still pretty good chance anding those two
you'll still have a value. So these two branch predictors should
be inverted .
Signed-Off-By: Daniel Walker <[email protected]>
Index: linux-2.6.16/kernel/irq/migration.c
===================================================================
--- linux-2.6.16.orig/kernel/irq/migration.c
+++ linux-2.6.16/kernel/irq/migration.c
@@ -30,7 +30,7 @@ void move_native_irq(int irq)
desc->move_irq = 0;
- if (likely(cpus_empty(pending_irq_cpumask[irq])))
+ if (unlikely(cpus_empty(pending_irq_cpumask[irq])))
return;
if (!desc->handler->set_affinity)
@@ -49,7 +49,7 @@ void move_native_irq(int irq)
* cause some ioapics to mal-function.
* Being paranoid i guess!
*/
- if (unlikely(!cpus_empty(tmp))) {
+ if (likely(!cpus_empty(tmp))) {
if (likely(!(desc->status & IRQ_DISABLED)))
desc->handler->disable(irq);
-
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