genirq: Introduce IRQD_AFFINITY_MANAGED flag

[cascardo/linux.git] / kernel / irq / manage.c

diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
index ef0bc02..30658e9 100644 (file)
--- a/kernel/irq/manage.c
+++ b/kernel/irq/manage.c
@@ -115,12 +115,12 @@ EXPORT_SYMBOL(synchronize_irq);
 #ifdef CONFIG_SMP
 cpumask_var_t irq_default_affinity;
 
-static int __irq_can_set_affinity(struct irq_desc *desc)
+static bool __irq_can_set_affinity(struct irq_desc *desc)
 {
        if (!desc || !irqd_can_balance(&desc->irq_data) ||
            !desc->irq_data.chip || !desc->irq_data.chip->irq_set_affinity)
-               return 0;
-       return 1;
+               return false;
+       return true;
 }
 
 /**
@@ -133,6 +133,21 @@ int irq_can_set_affinity(unsigned int irq)
        return __irq_can_set_affinity(irq_to_desc(irq));
 }
 
+/**
+ * irq_can_set_affinity_usr - Check if affinity of a irq can be set from user space
+ * @irq:       Interrupt to check
+ *
+ * Like irq_can_set_affinity() above, but additionally checks for the
+ * AFFINITY_MANAGED flag.
+ */
+bool irq_can_set_affinity_usr(unsigned int irq)
+{
+       struct irq_desc *desc = irq_to_desc(irq);
+
+       return __irq_can_set_affinity(desc) &&
+               !irqd_affinity_is_managed(&desc->irq_data);
+}
+
 /**
  *     irq_set_thread_affinity - Notify irq threads to adjust affinity
  *     @desc:          irq descriptor which has affitnity changed