linux-kernel - [PATCH, resend #2] x86: eliminate pointless adjustment attempts in fixup

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Date:	Thu, 17 Feb 2011 15:54:26 +0000
From:	"Jan Beulich" <JBeulich@...ell.com>
To:	<mingo@...e.hu>, <tglx@...utronix.de>, <hpa@...or.com>
Cc:	<linux-kernel@...r.kernel.org>
Subject: [PATCH, resend #2] x86: eliminate pointless adjustment
	 attempts in fixup_irqs()

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@...ell.com>

---
 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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