[PATCH] cgroups: update documentation on task moving restriction

[Li Zefan]

- ns cgroup has been removed.
- it's true moving a task to another cgroup can fail.

Signed-off-by: Li Zefan <lizf@xxxxxxxxxxxxxx>
---
 Documentation/cgroups/cgroups.txt |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/Documentation/cgroups/cgroups.txt b/Documentation/cgroups/cgroups.txt
index cd67e90..9c452ef 100644
--- a/Documentation/cgroups/cgroups.txt
+++ b/Documentation/cgroups/cgroups.txt
@@ -454,8 +454,8 @@ mounted hierarchy, to remove a task from its current cgroup you must
 move it into a new cgroup (possibly the root cgroup) by writing to the
 new cgroup's tasks file.
 
-Note: If the ns cgroup is active, moving a process to another cgroup can
-fail.
+Note: Due to some restrictions enforced by some cgroup subsystems, moving
+a process to another cgroup can fail.
 
 2.3 Mounting hierarchies by name
 --------------------------------
-- 
1.7.3.1
--
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