commit 687446760bd008df96655cb8c5900f8e48a7118c
author Li Zefan <lizf@cn.fujitsu.com> Wed Nov 12 13:26:49 2008 -0800
committer Linus Torvalds <torvalds@linux-foundation.org> Wed Nov 12 17:17:16 2008 -0800
tree b4834a1e88d98234cfad90a0880b54ba1cc3cc59
parent 0bcb6069a6e1af5c114a2a8873ec43ada8933596

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>