This is a checkpatch'd version of the pids patchset[1]. It fixes some
style problems, as well as switch to using need_canfork_callback inside
kernel/cgroup.c. Also remove the dependency on PAGE_COUNTER (because
pids now uses an internal hierarchical counter) in Kconfig.

[1]: https://lkml.org/lkml/2015/3/4/1198

Aleksa Sarai (2):
  cgroups: allow a cgroup subsystem to reject a fork
  cgroups: add a pids subsystem

 include/linux/cgroup.h        |   9 ++
 include/linux/cgroup_subsys.h |   4 +
 init/Kconfig                  |  11 ++
 kernel/Makefile               |   1 +
 kernel/cgroup.c               |  82 +++++++++---
 kernel/cgroup_pids.c          | 282 ++++++++++++++++++++++++++++++++++++++++++
 kernel/fork.c                 |  12 +-
 7 files changed, 384 insertions(+), 17 deletions(-)
 create mode 100644 kernel/cgroup_pids.c

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2.3.1