1 files changed, 39 insertions, 1 deletions

diff --git a/include/linux/interrupt.h b/include/linux/interrupt.h
index c7bfac1c4a7b..051c85032f48 100644
--- a/include/linux/interrupt.h
+++ b/include/linux/interrupt.h
@@ -203,7 +203,40 @@ static inline int check_wakeup_irqs(void) { return 0; }
 
 extern cpumask_var_t irq_default_affinity;
 
-extern int irq_set_affinity(unsigned int irq, const struct cpumask *cpumask);
+/* Internal implementation. Use the helpers below */
+extern int __irq_set_affinity(unsigned int irq, const struct cpumask *cpumask,
+                              bool force);
+
+/**
+ * irq_set_affinity - Set the irq affinity of a given irq
+ * @irq:        Interrupt to set affinity
+ * @cpumask:    cpumask
+ *
+ * Fails if cpumask does not contain an online CPU
+ */
+static inline int
+irq_set_affinity(unsigned int irq, const struct cpumask *cpumask)
+{
+        return __irq_set_affinity(irq, cpumask, false);
+}
+
+/**
+ * irq_force_affinity - Force the irq affinity of a given irq
+ * @irq:        Interrupt to set affinity
+ * @cpumask:    cpumask
+ *
+ * Same as irq_set_affinity, but without checking the mask against
+ * online cpus.
+ *
+ * Solely for low level cpu hotplug code, where we need to make per
+ * cpu interrupts affine before the cpu becomes online.
+ */
+static inline int
+irq_force_affinity(unsigned int irq, const struct cpumask *cpumask)
+{
+        return __irq_set_affinity(irq, cpumask, true);
+}
+
 extern int irq_can_set_affinity(unsigned int irq);
 extern int irq_select_affinity(unsigned int irq);
 
@@ -239,6 +272,11 @@ static inline int irq_set_affinity(unsigned int irq, const struct cpumask *m)
         return -EINVAL;
 }
 
+static inline int irq_force_affinity(unsigned int irq, const struct cpumask *cpumask)
+{
+        return 0;
+}
+
 static inline int irq_can_set_affinity(unsigned int irq)
 {
         return 0;