diff --git a/arch/parisc/kernel/irq.c b/arch/parisc/kernel/irq.c
index 006385dbee66..f7ae2bcd49a5 100644
--- a/arch/parisc/kernel/irq.c
+++ b/arch/parisc/kernel/irq.c
@@ -291,12 +291,14 @@ void do_cpu_irq_mask(struct pt_regs *regs)
 static struct irqaction timer_action = {
 	.handler = timer_interrupt,
 	.name = "timer",
+	.flags = SA_INTERRUPT,
 };
 
 #ifdef CONFIG_SMP
 static struct irqaction ipi_action = {
 	.handler = ipi_interrupt,
 	.name = "IPI",
+	.flags = SA_INTERRUPT,
 };
 #endif
 
diff --git a/arch/parisc/kernel/smp.c b/arch/parisc/kernel/smp.c
index a9ecf6465784..268b0f2a328e 100644
--- a/arch/parisc/kernel/smp.c
+++ b/arch/parisc/kernel/smp.c
@@ -338,6 +338,10 @@ smp_call_function (void (*func) (void *info), void *info, int retry, int wait)
 
 	/* Can deadlock when called with interrupts disabled */
 	WARN_ON(irqs_disabled());
+
+	/* can also deadlock if IPIs are disabled */
+	WARN_ON((get_eiem() & (1UL<<(CPU_IRQ_MAX - IPI_IRQ))) == 0);
+
 	
 	data.func = func;
 	data.info = info;