netdev - [net-next-2.6 PATCH 1/3] irq: Export irq_set

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Message-ID: <20091021022626.32449.73883.stgit@localhost.localdomain>
Date:	Tue, 20 Oct 2009 19:26:53 -0700
From:	Jeff Kirsher <jeffrey.t.kirsher@...el.com>
To:	davem@...emloft.net
Cc:	gospo@...hat.com, netdev@...r.kernel.org,
	Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@...el.com>,
	Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Subject: [net-next-2.6 PATCH 1/3] irq: Export irq_set_affinity() for drivers

From: Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@...el.com>

This patch allows drivers to specify an IRQ affinity mask for
their respective interrupt sources.  This is very useful on
network adapters using MSI-X, where aligning network flows
linearly to CPUs greatly improves efficiency of the network
stack.

Today, users must either hand-set affinity through /proc, or
use a script through the same interface.  This patch will allow
a driver to come completely pre-canned with an optimal
configuration.

Signed-off-by: Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@...el.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
---

 kernel/irq/manage.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
index bde4c66..185eb26 100644
--- a/kernel/irq/manage.c
+++ b/kernel/irq/manage.c
@@ -137,6 +137,7 @@ int irq_set_affinity(unsigned int irq, const struct cpumask *cpumask)
 	spin_unlock_irqrestore(&desc->lock, flags);
 	return 0;
 }
+EXPORT_SYMBOL(irq_set_affinity);
 
 #ifndef CONFIG_AUTO_IRQ_AFFINITY
 /*

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