From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755114Ab2BHUsh (ORCPT ); Wed, 8 Feb 2012 15:48:37 -0500 Received: from mx1.redhat.com ([209.132.183.28]:36304 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754275Ab2BHUsg (ORCPT ); Wed, 8 Feb 2012 15:48:36 -0500 From: Prarit Bhargava To: linux-kernel@vger.kernel.org Cc: Prarit Bhargava Subject: [PATCH] Use NUMA node cpu mask in irq affinity Date: Wed, 8 Feb 2012 15:48:33 -0500 Message-Id: <1328734113-3608-1-git-send-email-prarit@redhat.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The irq affinity files (/proc/irq/.../smp_affinity) contain a mask that is used to "pin" an irq to a set of cpus. On boot this set is currently all cpus. This can be incorrect as ACPI SRAT may tell us that a specific device or bus is attached to a particular node and it's cpus. When setting up the irq affinity we should take into account the NUMA node cpu mask by and'ing it into the irq's affinity mask. Signed-off-by: Prarit Bhargava Acked-by: Neil Horman --- kernel/irq/manage.c | 2 ++ 1 files changed, 2 insertions(+), 0 deletions(-) diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c index a9a9dbe..2fb3469 100644 --- a/kernel/irq/manage.c +++ b/kernel/irq/manage.c @@ -301,6 +301,8 @@ setup_affinity(unsigned int irq, struct irq_desc *desc, struct cpumask *mask) } cpumask_and(mask, cpu_online_mask, set); + if (desc->irq_data.node != -1) + cpumask_and(mask, mask, cpumask_of_node(desc->irq_data.node)); ret = chip->irq_set_affinity(&desc->irq_data, mask, false); switch (ret) { case IRQ_SET_MASK_OK: -- 1.7.1