[GIT PULL] per-cpu changes for v3.11-rc1

[GIT PULL] per-cpu changes for v3.11-rc1

[Tejun Heo]

Hello, Linus.

This pull request contains Kent's per-cpu reference counter.  It has
gone through several iterations since the last time and the dynamic
allocation is gone.  The usual usage is relatively straight-forward
although async kill confirm interface, which is not used int most
cases, is somewhat icky.  There also are some interface concerns -
e.g. I'm not sure about passing in @relesae callback during init as
that becomes funny when we later implement synchronous kill_and_drain
- but nothing too serious and it's quite useable now.

cgroup_subsys_state refcnting has already been converted and we should
convert module refcnt (Kent?).

Please pull from the following branch to receive the per-cpu reference
counter.

  git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu.git for-3.11

Thanks.

----------------------------------------------------------------
Kent Overstreet (2):
      percpu: implement generic percpu refcounting
      percpu-refcount: Don't use silly cmpxchg()

Tejun Heo (6):
      percpu-refcount: consistently use plain (non-sched) RCU
      percpu-refcount: cosmetic updates
      percpu-refcount: add __must_check to percpu_ref_init() and don't use ACCESS_ONCE() in percpu_ref_kill_rcu()
      percpu-refcount: implement percpu_ref_cancel_init()
      percpu-refcount: implement percpu_tryget() along with percpu_ref_kill_and_confirm()
      percpu-refcount: use RCU-sched insted of normal RCU

 include/linux/percpu-refcount.h | 174 ++++++++++++++++++++++++++++++++++++++++
 lib/Makefile                    |   2 +-
 lib/percpu-refcount.c           | 158 ++++++++++++++++++++++++++++++++++++
 3 files changed, 333 insertions(+), 1 deletion(-)
 create mode 100644 include/linux/percpu-refcount.h
 create mode 100644 lib/percpu-refcount.c

-- 
tejun