1 files changed, 15 insertions, 0 deletions
diff --git a/arch/x86/kernel/irq_64.c b/arch/x86/kernel/irq_64.c
index f0c7356c8969..c0bea0d7d76a 100644
--- a/arch/x86/kernel/irq_64.c
+++ b/arch/x86/kernel/irq_64.c
@@ -87,3 +87,18 @@ bool handle_irq(struct irq_desc *desc, struct pt_regs *regs)
 	generic_handle_irq_desc(desc);
 	return true;
 }
+
+static int map_irq_stack(unsigned int cpu)
+{
+	void *va = per_cpu_ptr(irq_stack_union.irq_stack, cpu);
+
+	per_cpu(hardirq_stack_ptr, cpu) = va + IRQ_STACK_SIZE;
+	return 0;
+}
+
+int irq_init_percpu_irqstack(unsigned int cpu)
+{
+	if (per_cpu(hardirq_stack_ptr, cpu))
+		return 0;
+	return map_irq_stack(cpu);
+}