From mboxrd@z Thu Jan  1 00:00:00 1970
From: Oleg Nesterov <oleg-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
Subject: [PATCH 0/1] do not abuse ->cred_guard_mutex in threadgroup_lock()
Date: Sat, 9 Mar 2013 21:00:46 +0100
Message-ID: <20130309200046.GA8149@redhat.com>
References: <20130306223657.GA7392@redhat.com> <20130307172545.GA10353@redhat.com> <20130307180139.GD29601@htj.dyndns.org> <20130307180332.GE29601@htj.dyndns.org> <20130307191242.GA18265@redhat.com> <20130307193820.GB3209@htj.dyndns.org> <513A9A67.60909@huawei.com> <20130309032936.GT14556@mtj.dyndns.org> <513AE918.7020704@huawei.com>
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To: Li Zefan <lizefan-hv44wF8Li93QT0dZR+AlfA@public.gmane.org>
Cc: Tejun Heo <tj-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>, Dave Jones <davej-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>, Linux Kernel <linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>, Alexander Viro <viro-RmSDqhL/yNMiFSDQTTA3OLVCufUGDwFn@public.gmane.org>, cgroups-u79uwXL29TY76Z2rM5mHXA@public.gmane.org

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.