From 26ff6ad9786abf6f40a6d3cbb89753b4fa50cb00 Mon Sep 17 00:00:00 2001
From: Srivatsa Vaddagiri <vatsa@in.ibm.com>
Date: Fri, 16 Sep 2005 19:27:40 -0700
Subject: [PATCH] CPU hotplug breaks wake_up_new_task

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>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---
 kernel/fork.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

(limited to 'kernel')

diff --git a/kernel/fork.c b/kernel/fork.c
index 8149f360288..533ce27f4b2 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -1062,7 +1062,8 @@ static task_t *copy_process(unsigned long clone_flags,
 	 * 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());
 
 	/*
-- 
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