Messages in this thread Patch in this message | | | Date | Mon, 05 Jul 2010 11:32:07 +0100 | From | "Jan Beulich" <> | Subject | [PATCH] x86: eliminate pointless adjustment attempts in fixup_irqs() |
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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>
--- 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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