Hi, Chained IRQ handlers are always marked IRQ_NOTHREAD, which means forced threading doesn't apply to them. I think this means they can't safely use non-raw spinlocks under CONFIG_PREEMPT_RT_FULL. Is this correct? I have an ARM system with a CONFIG_PREEMPT_RT_FULL kernel which prints lockdep warnings from many places because of this. It also locks up under moderate load, which I think is related to this issue. Any suggestions? Thanks, Brian Silverman -- To unsubscribe from this list: send the line "unsubscribe linux-rt-users" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html