Hi, The spin_lock_irqsave uses an "unsigned long flags" variable to save the irq state. But if the cpu has more that 64 interrupts, how this save and restore is happening? ( For eg: Arm has 96 interrupts) Regards, Arun C -- To unsubscribe from this list: send an email with "unsubscribe kernelnewbies" to ecartis@xxxxxxxxxxxx Please read the FAQ at http://kernelnewbies.org/FAQ