[PATCH, resend #2] x86: eliminate pointless adjustment attempts in fixup_irqs()

From: Jan Beulich
Date: Thu Feb 17 2011 - 10:53:41 EST


Not only when an IRQ's affinity equals cpu_online_mask is there no
need to actually try to adjust the affinity, but also when it's a
subset thereof. This particularly avoids adjustment attempts during
system shutdown to any IRQs bound to CPU#0.

Signed-off-by: Jan Beulich <jbeulich@xxxxxxxxxx>

---
arch/x86/kernel/irq.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

--- 2.6.38-rc5/arch/x86/kernel/irq.c
+++ 2.6.38-rc5-x86-reduce-fixup-irqs/arch/x86/kernel/irq.c
@@ -310,7 +310,7 @@ void fixup_irqs(void)
data = &desc->irq_data;
affinity = data->affinity;
if (!irq_has_action(irq) ||
- cpumask_equal(affinity, cpu_online_mask)) {
+ cpumask_subset(affinity, cpu_online_mask)) {
raw_spin_unlock(&desc->lock);
continue;
}



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