linux-kernel - [PATCH] x86: eliminate pointless adjustment attempts in fixup

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Message-Id: <4C31D0C70200007800009863@vpn.id2.novell.com>
Date:	Mon, 05 Jul 2010 11:32:07 +0100
From:	"Jan Beulich" <JBeulich@...ell.com>
To:	<mingo@...e.hu>, <tglx@...utronix.de>, <hpa@...or.com>
Cc:	<linux-kernel@...r.kernel.org>
Subject: [PATCH] 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(-)

--- linux-2.6.35-rc4/arch/x86/kernel/irq.c	2010-02-24 19:52:17.000000000 +0100
+++ 2.6.35-rc4-x86-reduce-irq-fixup/arch/x86/kernel/irq.c	2010-07-05 10:20:16.000000000 +0200
@@ -298,7 +298,7 @@ void fixup_irqs(void)
 
 		affinity = desc->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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