Pull cgroup fixes from Tejun Heo:

 - Fix a recent regression where a sleeping kernfs function is called
   with css_set_lock (spinlock) held

 - Revert the commit to enable cgroup1 support for cgroup_get_from_fd/file()

   Multiple users assume that the lookup only works for cgroup2 and
   breaks when fed a cgroup1 file. Instead, introduce a separate set of
   functions to lookup both v1 and v2 and use them where the user
   explicitly wants to support both versions.

 - Compat update for tools/perf/util/bpf_skel/bperf_cgroup.bpf.c.

 - Add Josef Bacik as a blkcg maintainer.

* tag 'cgroup-for-6.1-rc1-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup:
  blkcg: Update MAINTAINERS entry
  mm: cgroup: fix comments for get from fd/file helpers
  perf stat: Support old kernels for bperf cgroup counting
  bpf: cgroup_iter: support cgroup1 using cgroup fd
  cgroup: add cgroup_v1v2_get_from_[fd/file]()
  Revert "cgroup: enable cgroup_get_from_file() on cgroup1"
  cgroup: Reorganize css_set_lock and kernfs path processing