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authorKAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>2007-10-18 23:40:47 -0700
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-10-19 11:53:44 -0700
commit73e753a50dcac7d6d4fa8b9552203ef544a70d77 (patch)
tree7e8569cb99f6792bb436a07ec5ea45632b9c4ecf
parent470fd646444c65a5d062a371f5ec8dcedee61239 (diff)
downloadvexpress-lsk-73e753a50dcac7d6d4fa8b9552203ef544a70d77.tar.gz
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>
-rw-r--r--kernel/cpu.c9
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)