The xmon and cascade irq handlers must not run as threads.
pmac_pic_lock is already a raw_spinlock, but the irq flag
IRQF_NO_THREAD needs to be set as well.
Signed-off-by: NJohn Ogness <john.ogness@linutronix.de>
Signed-off-by: NMichael Ellerman <mpe@ellerman.id.au>