From: Srivatsa Vaddagiri <vatsa@in.ibm.com>

Fix a problem wherein a new-born task is added to a dead CPU.

Signed-off-by: Srivatsa Vaddagiri <vatsa@in.ibm.com>
Acked-by: Nick Piggin <nickpiggin@yahoo.com.au>
Acked-by: Shaohua Li <shaohua.li@intel.com>
Acked-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
---

 kernel/fork.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletion(-)

diff -puN kernel/fork.c~cpu-hotplug-breaks-wake_up_new_task kernel/fork.c
--- devel/kernel/fork.c~cpu-hotplug-breaks-wake_up_new_task	2005-09-15 01:28:21.000000000 -0700
+++ devel-akpm/kernel/fork.c	2005-09-15 01:28:21.000000000 -0700
@@ -1062,7 +1062,8 @@ static task_t *copy_process(unsigned lon
 	 * parent's CPU). This avoids alot of nasty races.
 	 */
 	p->cpus_allowed = current->cpus_allowed;
-	if (unlikely(!cpu_isset(task_cpu(p), p->cpus_allowed)))
+	if (unlikely(!cpu_isset(task_cpu(p), p->cpus_allowed) ||
+			!cpu_online(task_cpu(p))))
 		set_task_cpu(p, smp_processor_id());
 
 	/*
_