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SubjectRe: [patch] cpusets: allow PF_THREAD_BOUND kworkers to escape from a cpuset
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On Fri, 2011-09-23 at 15:00 +0800, Li Zefan wrote:

> To make the code more self-explanatory, I think this is a bit better:
>
> if (... && cont != cont->top_cgroup)
>

Done, your ACK added as well.

kworkers can be born in a cpuset, leaving them adrift on an unsinkable ship.
Allow them to be moved to the root cpuset so the cpuset can be destroyed.

Signed-off-by: Mike Galbraith <efault@gmx.de>
Acked-by: Li Zefan <lizf@cn.fujitsu.com>

diff --git a/kernel/cpuset.c b/kernel/cpuset.c
index 10131fd..b26f4c4 100644
--- a/kernel/cpuset.c
+++ b/kernel/cpuset.c
@@ -1384,7 +1384,7 @@ static int cpuset_can_attach(struct cgroup_subsys *ss, struct cgroup *cont,
* set_cpus_allowed_ptr() on all attached tasks before cpus_allowed may
* be changed.
*/
- if (tsk->flags & PF_THREAD_BOUND)
+ if (tsk->flags & PF_THREAD_BOUND && cont != cont->top_cgroup)
return -EINVAL;

return 0;



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