On Tue, Aug 21, 2012 at 09:03:49PM -0700, Stephen Boyd wrote: > Nothing stops a process from hotplugging in a CPU concurrently > with a sys_reboot() call. In such a situation we could have > ipi_cpu_stop() mark a cpu as 'offline' and _cpu_up() ignore the > fact that the CPU is not really offline and call the > CPU_UP_PREPARE notifier. When this happens stop_machine code will > complain that the cpu thread already exists and BUG_ON().
This puts us at odds with x86, which is a bad thing without first investigating whether a generic solution which fixes all arches would be more appropriate. A better solution may be to mark those CPUs as being not-present, which will prevent them being hot-plugged back. -- 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/
