Export irq_get_affinity API for drivers to read the smp affinity of an IRQ safely.
Signed-off-by: Lina Iyer <lina.i...@linaro.org> --- 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 majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/