linux-kernel - [patch] cpusets: allow PF_THREAD_BOUND kworkers to escape from a cpuset

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Date:	Fri, 23 Sep 2011 08:21:14 +0200
From:	Mike Galbraith <mgalbraith@...e.de>
To:	LKML <linux-kernel@...r.kernel.org>
Cc:	Paul Menage <paul@...lmenage.org>
Subject: [patch] cpusets: allow PF_THREAD_BOUND kworkers to escape from a
 cpuset


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@....de>

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->parent)
 		return -EINVAL;
 
 	return 0;


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