[PATCH 0/1] do not abuse ->cred_guard_mutex in threadgroup_lock()

[Oleg Nesterov]

On 03/09, Li Zefan wrote:
>
> We don't need both patches for 3.9, so we'll queue Oleg's fix for 3.9 and
> yours for 3.10?

Well. OK, please see 1/1 (compile tested only).

But I still like the patch from Tejun more... Except _perhaps_ my
patch is better for 3.9 just because it is simpler.

And. I still think that probably we can avoid thread_group_leader()
recheck-and-restart logic in attach_task_by_pid(). But even if this
is true (and thus we can revert the changes in de_thread), we should
do this on top of Tejun's patch.

Oleg.

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