From: Li Zefan <lizf@cn.fujitsu.com>
Date: Wed, 12 Nov 2008 21:26:49 +0000 (-0800)
Subject: freezer_cg: remove task_lock from freezer_fork()
X-Git-Tag: v2.6.28-rc5~50
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=687446760bd008df96655cb8c5900f8e48a7118c;p=pandora-kernel.git

freezer_cg: remove task_lock from freezer_fork()

In theory the task can be moved to another cgroup and the freezer will be
freed right after task_lock is dropped, so the lock results in zero
protection.

But in the case of freezer_fork() no lock is needed, since the task is not
in tasklist yet so it won't be moved to another cgroup, so task->cgroups
won't be changed or invalidated.

Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
Cc: Matt Helsley <matthltc@us.ibm.com>
Cc: Cedric Le Goater <clg@fr.ibm.com>
Cc: "Serge E. Hallyn" <serue@us.ibm.com>
Cc: Paul Menage <menage@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

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