Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753763AbaKRHdw (ORCPT ); Tue, 18 Nov 2014 02:33:52 -0500 Received: from mail-ie0-f173.google.com ([209.85.223.173]:54131 "EHLO mail-ie0-f173.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753370AbaKRHdD (ORCPT ); Tue, 18 Nov 2014 02:33:03 -0500 From: Lina Iyer To: khilman@linaro.org, ulf.hansson@linaro.org, linux-arm-kernel@lists.infradead.org, linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org, rjw@rjwysocki.net, daniel.lezcano@linaro.org Cc: Lina Iyer Subject: [PATCH v4/RFC 3/4] irq: Add irq_get_affinity() api Date: Tue, 18 Nov 2014 00:31:49 -0700 Message-Id: <1416295910-40433-4-git-send-email-lina.iyer@linaro.org> X-Mailer: git-send-email 2.1.0 In-Reply-To: <1416295910-40433-1-git-send-email-lina.iyer@linaro.org> References: <1416295910-40433-1-git-send-email-lina.iyer@linaro.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Export irq_get_affinity API for drivers to read the smp affinity of an IRQ safely. Signed-off-by: Lina Iyer --- include/linux/interrupt.h | 8 ++++++++ kernel/irq/manage.c | 18 ++++++++++++++++++ 2 files changed, 26 insertions(+) diff --git a/include/linux/interrupt.h b/include/linux/interrupt.h index 69517a2..fff619c 100644 --- a/include/linux/interrupt.h +++ b/include/linux/interrupt.h @@ -260,6 +260,8 @@ extern int irq_set_affinity_hint(unsigned int irq, const struct cpumask *m); extern int irq_set_affinity_notifier(unsigned int irq, struct irq_affinity_notify *notify); +extern int irq_get_affinity(unsigned int irq, struct cpumask *mask); + #else /* CONFIG_SMP */ static inline int irq_set_affinity(unsigned int irq, const struct cpumask *m) @@ -290,6 +292,12 @@ irq_set_affinity_notifier(unsigned int irq, struct irq_affinity_notify *notify) { return 0; } + +static inline int irq_get_affinity(unsigned int irq, struct cpumask *mask) +{ + return -EINVAL; +} + #endif /* CONFIG_SMP */ /* diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c index 0a9104b..2d17098 100644 --- a/kernel/irq/manage.c +++ b/kernel/irq/manage.c @@ -246,6 +246,24 @@ int irq_set_affinity_hint(unsigned int irq, const struct cpumask *m) } EXPORT_SYMBOL_GPL(irq_set_affinity_hint); +int irq_get_affinity(unsigned int irq, struct cpumask *mask) +{ + struct irq_desc *desc = irq_to_desc(irq); + unsigned long flags; + + if (!mask) + return -EINVAL; + + raw_spin_lock_irqsave(&desc->lock, flags); + if (!irqd_irq_disabled(&desc->irq_data)) + cpumask_copy(mask, desc->irq_data.affinity); + else + cpumask_clear(mask); + raw_spin_unlock_irqrestore(&desc->lock, flags); + + return 0; +} + static void irq_affinity_notify(struct work_struct *work) { struct irq_affinity_notify *notify = -- 2.1.0 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/