[PATCH 2/4] cgroup: remove redundant get/put of task struct

[Li Zefan]

Mandeep Singh Baines wrote:
> threadgroup_lock() guarantees that the target threadgroup will
> remain stable - no new task will be added, no new PF_EXITING
> will be set and exec won't happen.
> 
> Changes in V2:
> * https://lkml.org/lkml/2011/12/20/369 (Tejun Heo)
>   * Undo incorrect removal of get/put from attach_task_by_pid()
> * Author
>   * Remove a comment which is made stale by this change
> 
> Signed-off-by: Mandeep Singh Baines <msb at chromium.org>

Acked-by: Li Zefan <lizf at cn.fujitsu.com>

> Cc: Tejun Heo <tj at kernel.org>
> Cc: Li Zefan <lizf at cn.fujitsu.com>
> Cc: containers at lists.linux-foundation.org
> Cc: cgroups at vger.kernel.org
> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu at jp.fujitsu.com>
> Cc: Frederic Weisbecker <fweisbec at gmail.com>
> Cc: Oleg Nesterov <oleg at redhat.com>
> Cc: Andrew Morton <akpm at linux-foundation.org>
> Cc: Paul Menage <paul at paulmenage.org>
> ---
>  kernel/cgroup.c |   11 ++---------
>  1 files changed, 2 insertions(+), 9 deletions(-)