From: Tejun Heo <tj@kernel.org>
Date: Sat, 28 Jun 2014 12:10:13 +0000 (-0400)
Subject: percpu-refcount: add helpers for ->percpu_count accesses
X-Git-Tag: cleanup-for-v3.18~150^2~3
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=eae7975ddf031b3084f4a5f7d88f698aefad96fb;p=pandora-kernel.git

percpu-refcount: add helpers for ->percpu_count accesses

* All four percpu_ref_*() operations implemented in the header file
  perform the same operation to determine whether the percpu_ref is
  alive and extract the percpu pointer.  Factor out the common logic
  into __pcpu_ref_alive().  This doesn't change the generated code.

* There are a couple places in percpu-refcount.c which masks out
  PCPU_REF_DEAD to obtain the percpu pointer.  Factor it out into
  pcpu_count_ptr().

* The above changes make the WARN_ON_ONCE() conditional at the top of
  percpu_ref_kill_and_confirm() the only user of REF_STATUS().  Test
  PCPU_REF_DEAD directly and remove REF_STATUS().

This patch doesn't introduce any functional change.

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Kent Overstreet <kmo@daterainc.com>
Cc: Christoph Lameter <cl@linux-foundation.org>
---

Reading git-diff-tree failed