Re: cgroup: avoid attaching a cgroup root to two different superblocks

[Tejun Heo]

Hello, Li.

On Mon, Apr 17, 2017 at 06:41:38PM +0800, Zefan Li wrote:
> Now I remember why it didn't check NULL pointer... Could you try the following fix?
> It also reverts my previous patch. I would appreciate if you run the full test suit,
> to make sure it won't break anything.

Can you please refresh the patch on top of cgroup/for-next which
already has the original patch reverted?  Let's apply this one for
for-4.12 w/o -stable.  The bug isn't too likely to trigger in the wild
and the fix is kinda subtle.  If necessary, we can last ask Greg to
pick it up once we know that the patch is safe.

> PS: Tejun, I found recently I can no longer receive your emails. Don't know why...

Hah, no idea.  I didn't change anything on my side - all emails are
sent through gmail.com.

Thanks.

-- 
tejun