3.15 regression: wrong cgroup magic

[Andy Lutomirski]

Sorry I didn't notice this earlier.  Linux 3.15 breaks my production
system :(  The cause appears to be:

commit 2bd59d48ebfb3df41ee56938946ca0dd30887312
Author: Tejun Heo <tj@xxxxxxxxxx>
Date:   Tue Feb 11 11:52:49 2014 -0500

    cgroup: convert to kernfs

In particular, this piece:

-       sb->s_magic = CGROUP_SUPER_MAGIC;

The result is that cgroup shows up with the wrong magic number, so my
code goes "oh crap, cgroupfs isn't mounted" and fails.

I can change my code to hack around this, but I can imagine other
things getting tripped up.  Is there still time to fix this?

--Andy
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