From: Jan Beulich <JBeulich@novell.com>
Date: Thu, 17 Feb 2011 15:54:26 +0000 (+0000)
Subject: x86: Eliminate pointless adjustment attempts in fixup_irqs()
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=58bff947e2d164c7e5cbf7f485e4b3d4884befeb;p=linux-beck.git

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@novell.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Eric W. Biederman <ebiederm@xmission.com>
Cc: Suresh Siddha <suresh.b.siddha@intel.com>
Cc: Gary Hade <garyhade@us.ibm.com>
LKML-Reference: <4D5D52C2020000780003272C@vpn.id2.novell.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
---

diff --git a/arch/x86/kernel/irq.c b/arch/x86/kernel/irq.c
index 387b6a0c9e81..78793efd3180 100644
--- a/arch/x86/kernel/irq.c
+++ b/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;
 		}