diff options
| author | KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> | 2007-10-18 23:40:47 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-10-19 11:53:44 -0700 |
| commit | 73e753a50dcac7d6d4fa8b9552203ef544a70d77 (patch) | |
| tree | 7e8569cb99f6792bb436a07ec5ea45632b9c4ecf /kernel/cpu.c | |
| parent | 470fd646444c65a5d062a371f5ec8dcedee61239 (diff) | |
CPU HOTPLUG: avoid hotadd when proper possible_map isn't specified
cpu-hot-add should be fail if cpu is not set in cpu_possible_map. If go
ahead, the system will panic soon.
Especially, arch which requires additional_cpus= parameter should handle
this. Tested on ia64.
[akpm@linux-foundation.org: coding-style fixes]
Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel/cpu.c')
| -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) |