[PATCHSET] cgroup: Make debug controller useful for debugging

[Tejun Heo]

Hello, Waiman.

I dropped the thread mode part of the patches so that these aren't
blocked on thread mode, made the debug controller an implicit one on
cgroup2 which is enabled by "cgroup_debug" boot param (we can't mask
it on cgroup1 with the boot param at this point), and fixed the
lockdep warnings.

I applied the updated patches + follow up changes to cgroup/for-4.13.

 git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup.git for-4.13

I'd really appreciate if you can go over the patches and check that I
didn't do anything stupid.

Thanks.

--
tejun