diff options
| -rw-r--r-- | kernel/cpu.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/kernel/cpu.c b/kernel/cpu.c index ebf6647a2bd..6b3a0c15144 100644 --- a/kernel/cpu.c +++ b/kernel/cpu.c @@ -265,6 +265,15 @@ out_notify: int __cpuinit cpu_up(unsigned int cpu) { int err = 0; + if (!cpu_isset(cpu, cpu_possible_map)) { + printk(KERN_ERR "can't online cpu %d because it is not " + "configured as may-hotadd at boot time\n", cpu); +#if defined(CONFIG_IA64) || defined(CONFIG_X86_64) || defined(CONFIG_S390) + printk(KERN_ERR "please check additional_cpus= boot " + "parameter\n"); +#endif + return -EINVAL; + } mutex_lock(&cpu_add_remove_lock); if (cpu_hotplug_disabled) |