On Sun, Apr 19, 2015 at 08:01:40PM +0200, Ingo Molnar wrote: > That's all fine and good, but why is an IPI sent to a non-existent > CPU? It's not like we don't know which CPU is up and down.
The perf events code is trying to call smp_call_function_single() on the non-existent CPU in perf_event_exit_cpu_context() while handling the CPU_UP_CANCELED notification. perf_cpu_notify() handles CPU_UP_CANCELED and CPU_DOWN_PREPARE in the same way. (cpu_up() is tried for the non-existing CPUs because in this case what is specified in the device tree does not match reality.) -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
