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authorPeter P Waskiewicz Jr <peter.p.waskiewicz.jr@intel.com>2010-04-30 14:44:50 -0700
committerThomas Gleixner <tglx@linutronix.de>2010-05-03 11:50:57 +0200
commite7a297b0d7d6049bd4e423ac1e17da31e4c401b8 (patch)
treef10f12806a637b09bec89ef5428d981c4c1a4bc9 /include/linux/irq.h
parent6932bf37bed45ce8ed531928b1b0f98162fe6df6 (diff)
downloadop-kernel-dev-e7a297b0d7d6049bd4e423ac1e17da31e4c401b8.zip
op-kernel-dev-e7a297b0d7d6049bd4e423ac1e17da31e4c401b8.tar.gz
genirq: Add CPU mask affinity hint
This patch adds a cpumask affinity hint to the irq_desc structure, along with a registration function and a read-only proc entry for each interrupt. This affinity_hint handle for each interrupt can be used by underlying drivers that need a better mechanism to control interrupt affinity. The underlying driver can register a cpumask for the interrupt, which will allow the driver to provide the CPU mask for the interrupt to anything that requests it. The intent is to extend the userspace daemon, irqbalance, to help hint to it a preferred CPU mask to balance the interrupt into. [ tglx: Fixed compile warnings, added WARN_ON, made SMP only ] Signed-off-by: Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@intel.com> Cc: davem@davemloft.net Cc: arjan@linux.jf.intel.com Cc: bhutchings@solarflare.com LKML-Reference: <20100430214445.3992.41647.stgit@ppwaskie-hc2.jf.intel.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'include/linux/irq.h')
-rw-r--r--include/linux/irq.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/irq.h b/include/linux/irq.h
index 707ab12..c03243a 100644
--- a/include/linux/irq.h
+++ b/include/linux/irq.h
@@ -195,6 +195,7 @@ struct irq_desc {
raw_spinlock_t lock;
#ifdef CONFIG_SMP
cpumask_var_t affinity;
+ const struct cpumask *affinity_hint;
unsigned int node;
#ifdef CONFIG_GENERIC_PENDING_IRQ
cpumask_var_t pending_mask;
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