MIPS: Mark cascade and low level interrupts IRQF_NO_THREAD

Mark interrupts with no_action handler, cascade interrupts, low level
interrupts (bus error, halt ..) with IRQF_NO_THREAD to exclude them
from forced threading.

Signed-off-by: Wu Zhangjin <wuzhangjin@gmail.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-mips@linux-mips.org
Cc: Wu Zhangjin <wuzhangjin@gmail.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

arch/mips/ar7/irq.c

@@ -98,7 +98,8 @@ static struct irq_chip ar7_sec_irq_type = {
 
 static struct irqaction ar7_cascade_action = {
 	.handler = no_action,
-	.name = "AR7 cascade interrupt"
+	.name = "AR7 cascade interrupt",
+	.flags = IRQF_NO_THREAD,
 };
 
 static void __init ar7_irq_init(int base)