x86: Mark low level interrupts IRQF_NO_THREAD

These cannot be threaded.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

arch/x86/kernel/irqinit.c

@@ -71,6 +71,7 @@ static irqreturn_t math_error_irq(int cpl, void *dev_id)
 static struct irqaction fpu_irq = {
 	.handler = math_error_irq,
 	.name = "fpu",
+	.flags = IRQF_NO_THREAD,
 };
 #endif
 
@@ -80,6 +81,7 @@ static struct irqaction fpu_irq = {
 static struct irqaction irq2 = {
 	.handler = no_action,
 	.name = "cascade",
+	.flags = IRQF_NO_THREAD,
 };
 
 DEFINE_PER_CPU(vector_irq_t, vector_irq) = {

arch/x86/platform/visws/visws_quirks.c

@@ -569,11 +569,13 @@ static irqreturn_t piix4_master_intr(int irq, void *dev_id)
 static struct irqaction master_action = {
 	.handler =	piix4_master_intr,
 	.name =		"PIIX4-8259",
+	.flags =	IRQF_NO_THREAD,
 };
 
 static struct irqaction cascade_action = {
 	.handler = 	no_action,
 	.name =		"cascade",
+	.flags =	IRQF_NO_THREAD,
 };
 
 static inline void set_piix4_virtual_irq_type(void)