diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c
index 6ad4658de7056e02f104b505f35910587ec712f3..d23aa82e7a7bc25c702be004f804a0c9d02c15f7 100644
--- a/arch/x86/kernel/apic/io_apic.c
+++ b/arch/x86/kernel/apic/io_apic.c
@@ -3425,6 +3425,11 @@ int get_nr_irqs_gsi(void)
 	return nr_irqs_gsi;
 }
 
+unsigned int arch_dynirq_lower_bound(unsigned int from)
+{
+	return from < nr_irqs_gsi ? nr_irqs_gsi : from;
+}
+
 int __init arch_probe_nr_irqs(void)
 {
 	int nr;
diff --git a/include/linux/irq.h b/include/linux/irq.h
index 10a0b1ac4ea078e3e8e1b5f3117ab47b0dfba936..5c57efb863d08e5937a36e06778efa8047060156 100644
--- a/include/linux/irq.h
+++ b/include/linux/irq.h
@@ -603,6 +603,8 @@ static inline u32 irq_get_trigger_type(unsigned int irq)
 	return d ? irqd_get_trigger_type(d) : 0;
 }
 
+unsigned int arch_dynirq_lower_bound(unsigned int from);
+
 int __irq_alloc_descs(int irq, unsigned int from, unsigned int cnt, int node,
 		struct module *owner);
 
diff --git a/kernel/irq/irqdesc.c b/kernel/irq/irqdesc.c
index a7174617616ba6b8f404a1c3f01cf8b7dd90cb4d..bb07f2928f4b9c2ca33803f712c8889ca5823907 100644
--- a/kernel/irq/irqdesc.c
+++ b/kernel/irq/irqdesc.c
@@ -363,6 +363,13 @@ __irq_alloc_descs(int irq, unsigned int from, unsigned int cnt, int node,
 		if (from > irq)
 			return -EINVAL;
 		from = irq;
+	} else {
+		/*
+		 * For interrupts which are freely allocated the
+		 * architecture can force a lower bound to the @from
+		 * argument. x86 uses this to exclude the GSI space.
+		 */
+		from = arch_dynirq_lower_bound(from);
 	}
 
 	mutex_lock(&sparse_irq_lock);
diff --git a/kernel/softirq.c b/kernel/softirq.c
index b50990a5bea0220df9034f0bcc71d92e452edc78..33e4648ae0e7cd908671ef1a8ab60bbb562c097c 100644
--- a/kernel/softirq.c
+++ b/kernel/softirq.c
@@ -779,3 +779,8 @@ int __init __weak arch_early_irq_init(void)
 {
 	return 0;
 }
+
+unsigned int __weak arch_dynirq_lower_bound(unsigned int from)
+{
+	return from;
+}