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[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>
This commit is contained in:
Srivatsa Vaddagiri 2005-09-16 19:27:40 -07:00 committed by Linus Torvalds
parent fa72e26a64
commit 26ff6ad978
1 changed files with 2 additions and 1 deletions
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3
kernel/fork.c
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@ -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());
/*