1 files changed, 30 insertions, 0 deletions

diff --git a/kernel/irq/migration.c b/kernel/irq/migration.c
index 37ddb7bda651..6ca054a3f91d 100644
--- a/kernel/irq/migration.c
+++ b/kernel/irq/migration.c
@@ -4,6 +4,36 @@
 
 #include "internals.h"
 
+/**
+ * irq_fixup_move_pending - Cleanup irq move pending from a dying CPU
+ * @desc:               Interrupt descpriptor to clean up
+ * @force_clear:        If set clear the move pending bit unconditionally.
+ *                      If not set, clear it only when the dying CPU is the
+ *                      last one in the pending mask.
+ *
+ * Returns true if the pending bit was set and the pending mask contains an
+ * online CPU other than the dying CPU.
+ */
+bool irq_fixup_move_pending(struct irq_desc *desc, bool force_clear)
+{
+        struct irq_data *data = irq_desc_get_irq_data(desc);
+
+        if (!irqd_is_setaffinity_pending(data))
+                return false;
+
+        /*
+         * The outgoing CPU might be the last online target in a pending
+         * interrupt move. If that's the case clear the pending move bit.
+         */
+        if (cpumask_any_and(desc->pending_mask, cpu_online_mask) >= nr_cpu_ids) {
+                irqd_clr_move_pending(data);
+                return false;
+        }
+        if (force_clear)
+                irqd_clr_move_pending(data);
+        return true;
+}
+
 void irq_move_masked_irq(struct irq_data *idata)
 {
         struct irq_desc *desc = irq_data_to_desc(idata);