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-rw-r--r--include/linux/interrupt.h1
-rw-r--r--kernel/irq/manage.c25
2 files changed, 26 insertions, 0 deletions
diff --git a/include/linux/interrupt.h b/include/linux/interrupt.h
index ad16809c8596..cb30edbfe9fc 100644
--- a/include/linux/interrupt.h
+++ b/include/linux/interrupt.h
@@ -195,6 +195,7 @@ extern void disable_irq(unsigned int irq);
extern void disable_percpu_irq(unsigned int irq);
extern void enable_irq(unsigned int irq);
extern void enable_percpu_irq(unsigned int irq, unsigned int type);
+extern bool irq_percpu_is_enabled(unsigned int irq);
extern void irq_wake_thread(unsigned int irq, void *dev_id);
/* The following three functions are for the core kernel use only. */
diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
index 0eebaeef317b..c84670c373f9 100644
--- a/kernel/irq/manage.c
+++ b/kernel/irq/manage.c
@@ -1743,6 +1743,31 @@ out:
}
EXPORT_SYMBOL_GPL(enable_percpu_irq);
+/**
+ * irq_percpu_is_enabled - Check whether the per cpu irq is enabled
+ * @irq: Linux irq number to check for
+ *
+ * Must be called from a non migratable context. Returns the enable
+ * state of a per cpu interrupt on the current cpu.
+ */
+bool irq_percpu_is_enabled(unsigned int irq)
+{
+ unsigned int cpu = smp_processor_id();
+ struct irq_desc *desc;
+ unsigned long flags;
+ bool is_enabled;
+
+ desc = irq_get_desc_lock(irq, &flags, IRQ_GET_DESC_CHECK_PERCPU);
+ if (!desc)
+ return false;
+
+ is_enabled = cpumask_test_cpu(cpu, desc->percpu_enabled);
+ irq_put_desc_unlock(desc, flags);
+
+ return is_enabled;
+}
+EXPORT_SYMBOL_GPL(irq_percpu_is_enabled);
+
void disable_percpu_irq(unsigned int irq)
{
unsigned int cpu = smp_processor_id();