On Thu, Jul 11, 2013 at 04:48:51PM -0600, Stephen Warren wrote:> +int platform_can_cpu_hotplug(void)> +{> + if (!IS_ENABLED(CONFIG_HOTPLUG_CPU) || !smp_ops.cpu_kill)> + return 0;This is an inappropriate usage of IS_ENABLED(). When hotplug CPU isdisabled, there is no cpu_kill member in smp_ops, so this leads tobuild failure.Dropping your patch.